HK40038057B - Bicyclic peptide ligands specific for epha2 - Google Patents

Description

FIELD OF THE INVENTION

The present invention relates to a compound which is BCY6136 or a pharmaceutically acceptable salt thereof, wherein BCY6136 is as defined herein. The compound is a high affinity binder of the Eph receptor tyrosine kinase A2 (EphA2). The invention also includes pharmaceutical compositions comprising said compound and the use of said compound and pharmaceutical compositions in preventing, suppressing or treating a disease or disorder characterised by overexpression of EphA2 in diseased tissue (such as a tumour).

BACKGROUND OF THE INVENTION

Cyclic peptides are able to bind with high affinity and target specificity to protein targets and hence are an attractive molecule class for the development of therapeutics. In fact, several cyclic peptides are already successfully used in the clinic, as for example the antibacterial peptide vancomycin, the immunosuppressant drug cyclosporine or the anti-cancer drug octreotide (Driggers et al. (2008), Nat Rev Drug Discov 7 (7), 608-24). Good binding properties result from a relatively large interaction surface formed between the peptide and the target as well as the reduced conformational flexibility of the cyclic structures. Typically, macrocycles bind to surfaces of several hundred square angstrom, as for example the cyclic peptide CXCR4 antagonist CVX15 (400 Ų; Wu et al. (2007), Science 330, 1066-71), a cyclic peptide with the Arg-Gly-Asp motif binding to integrin αVb3 (355 Ų) (Xiong et al. (2002), Science 296 (5565), 151-5) or the cyclic peptide inhibitor upain-1 binding to urokinase-type plasminogen activator (603 Ų; Zhao et al. (2007), J Struct Biol 160 (1), 1-10).

Due to their cyclic configuration, peptide macrocycles are less flexible than linear peptides, leading to a smaller loss of entropy upon binding to targets and resulting in a higher binding affinity. The reduced flexibility also leads to locking target-specific conformations, increasing binding specificity compared to linear peptides. This effect has been exemplified by a potent and selective inhibitor of matrix metalloproteinase 8, (MMP-8) which lost its selectivity over other MMPs when its ring was opened (Cherney et al. (1998), J Med Chem 41 (11), 1749-51). The favorable binding properties achieved through macrocyclization are even more pronounced in multicyclic peptides having more than one peptide ring as for example in vancomycin, nisin and actinomycin.

Different research teams have previously tethered polypeptides with cysteine residues to a synthetic molecular structure (Kemp and McNamara (1985), J. Org. Chem; Timmerman et al. (2005), ChemBioChem). Meloen and co-workers had used tris(bromomethyl)benzene and related molecules for rapid and quantitative cyclisation of multiple peptide loops onto synthetic scaffolds for structural mimicry of protein surfaces (Timmerman et al. (2005), ChemBioChem). Methods for the generation of candidate drug compounds wherein said compounds are generated by linking cysteine containing polypeptides to a molecular scaffold as for example TATA (1,1',1"-(1,3,5-triazinane-1,3,5-triyl)triprop-2-en-1-one, Heinis et al. Angew Chem, Int Ed. 2014; 53:1602-1606). YAN SHI ET AL: "One-Bead-Two-Compound Thioether Bridged Macrocyclic [gamma]-AApeptide Screening Library against EphA2", JOURNAL OF MEDICINAL CHEMISTRY, vol. 60, no. 22, 14 November 2017, pages 9290-9298 discloses a peptide ligand specific for EphA2 that is cyclic (figure 1, page 9291). BAINAN WU ET AL: "Design and Characterization of Novel EphA2 Agonists for Targeted Delivery of Chemotherapy to Cancer Cells", CHEMISTRY AND BIOLOGY., vol. 22, no. 7, 1 July 2015 teaches conjugates of linear EphA2 peptides and a cytotoxic drug (paclitaxel).

Phage display-based combinatorial approaches have been developed to generate and screen large libraries of bicyclic peptides to targets of interest (Heinis et al. (2009), Nat Chem Biol 5 (7), 502-7 and WO 2009/098450 ). Briefly, combinatorial libraries of linear peptides containing three cysteine residues and two regions of six random amino acids (Cys-(Xaa)₆-Cys-(Xaa)₆-Cys) were displayed on phage and cyclised by covalently linking the cysteine side chains to a small molecule scaffold.

SUMMARY OF THE INVENTION

Provided herein is a compound, which compound is BCY6136 or a pharmaceutically acceptable salt thereof, wherein said compound BCY6136 has the structure: wherein BCY6099 is a polypeptide of SEQ ID NO: 2 (B-Ala)-Sar₁₀-A(HArg)D-C_i(HyP)LVNPLC_iiLHP(D-Asp)W(HArg)C_iii (SEQ ID NO: 2) wherein the polypeptide of SEQ ID NO: 2 is cyclised at C_i, C_ii and C_iii with 1,1',1"-(1,3,5-triazinane-1,3,5-triyl)triprop-2-en-1-one (TATA).

SEQ ID NO: 2 may be amidated at the C-terminus. The pharmaceutically acceptable salt may be selected from the free acid or the sodium, potassium, calcium, or ammonium salt. According to a further aspect of the invention, there is provided a pharmaceutical composition comprising the compound provided herein in combination with one or more pharmaceutically acceptable excipients.

According to a further aspect of the invention, there is provided the compound or pharmaceutical composition provided herein, for use in preventing, suppressing or treating a disease or disorder characterised by overexpression of EphA2 in diseased tissue (such as a tumour). The disease or disorder may be cancer. Also provided is the compound or pharmaceutical composition provided herein, for use in a method of preventing, suppressing or treating cancer.

The cancer may be selected from prostate cancer, lung cancer, breast cancer, gastric cancer, ovarian cancer, oesophageal cancer, multiple myeloma and fibrosarcoma. The lung cancer may be non-small cell lung carcinomas (NSCLC) and/or the breast cancer may be triple negative breast cancer.

Also provided is the compound or pharmaceutical composition provided herein, for use in a method of preventing, suppressing or treating cancer in a patient in need thereof, wherein said patient is identified as having an increased copy number variation (CNV) of EphA2.

BRIEF DESCRIPTION OF THE FIGURES

• Figure 1: Body weight changes after administering BCY6031 to female Balb/C nude mice bearing LU-01-0046 tumor. Data points represent group mean body weight.
• Figure 2: Tumor volume trace after administering BCY6031 to female Balb/C nude mice bearing LU-01-0046 tumor. Data points represent group mean. The treatment was ceased from day 28.
• Figure 3: General schematic demonstrating the concept of preparing Bicycle drug conjugates (BDCs).
• Figure 4: Plot of mean tumour volume versus time for BCY6136 in HT1080 xenograft mice. Doses (2, 3 and 5 mg/kg) were administered on days 0 and 7. Body weight changes during treatment indicative of tumour burden, drug-associated toxicology and overall animal health are illustrated in the top right inset.
• Figure 5: Plot of mean tumour volume versus time for BCY6136 in NCI-H1975 xenograft mice. Doses (1, 2 and 3 mg/kg) were administered on days 0, 7, 14, 21, 28 and 35. Body weight changes during treatment indicative of tumour burden, drug-associated toxicology and overall animal health are illustrated in the top right inset.
• Figure 6: Plot of mean tumour volume versus time for BCY6136 in MDA-MB-231 xenograft mice. Doses (1, 2 and 3 mg/kg) were administered on day 0, 7, 14, 21, 28, 35 and 45. Body weight changes during treatment indicative of tumour burden, drug-associated toxicology and overall animal health are illustrated in the top right inset.
• Figures 7 to 9: Body weight changes and tumor volume traces after administering BCY6136 (Figure 7), ADC (Figure 8) and BCY6033 (Figure 9) to female BALB/c nude mice bearing PC-3 xenograft. Data points represent group mean body weight.
• Figure 10: Body weight changes and tumor volume traces after administering BCY6136, EphA2-ADC or Docetaxel to male Balb/c nude mice bearing PC-3 xenograft. Data points represent group mean body weight.
• Figures 11 to 13: Body weight changes and tumor volume trace after administering BCY6033 (Figure 11), BCY6136 (Figure 12) and BCY6082 (Figure 13) to female Balb/c nude mice bearing NCI-H1975 xenograft. Data points represent group mean tumor volume and body weight.
• Figures 14and15: Body weight changes and tumor volume traces after administering BCY6136 and ADC to female Balb/c nude mice bearing LU-01-0251 xenograft. Data points represent group mean body weight.
• Figure 16: Body weight changes and tumor volume traces after administering BCY6033, BCY6136, BCY6082 and BCY6031 to female Balb/c nude mice bearing LU-01-0046. Data points represent group mean body weight.
• Figure 17: Body weight changes and tumor volume traces after administering BCY6136 or ADC to female Balb/c nude mice bearing LU-01-0046 NSCLC PDX model. Data points represent group mean body weight.
• Figures 18 to 22: Body weight changes and tumor volume traces after administering BCY6033 (Figure 18), BCY6136 (Figure 19), BCY6082 (Figure 20), BCY6173 (Figure 21) and BCYs 6175 and 6031 (Figure 22) to female Balb/c nude mice bearing LU-01-0046. Data points represent group mean body weight.
• Figure 23: Body weight changes and tumor volume traces after administering BCY6136 (referred to in Figure 23 as BT5528), BCY8245 or BCY8781 to female BALB/c nude mice bearing LU-01-0412 xenograft. Data points represent group mean tumor volume (left panel) and body weight (right panel).
• Figure 24: Body weight changes and tumor volume traces after administering BCY6136 to female Balb/c nude mice bearing LU-01-0486 xenograft. Data points represent group mean body weight.
• Figures 25 to 27: Body weight changes and tumor volume trace after administering BCY6033 (Figure 25), BCY6136 (Figure 26) and BCY6082 (Figure 27) to female Balb/c nude mice bearing MDA-MB-231-luc xenograft. Data points represent group mean tumor volume and body weight.
• Figure 28: Body weight changes and tumor volume traces after administering BCY6136 to female BALB/c mice bearing EMT-6 syngeneic. Data points represent group mean body weight. The dosage of group 3 and group 4 was changed to 5 mpk and 3 mpk from Day 14.
• Figure 29: Body weight changes and tumor volume traces after administering BCY6136 to female Balb/c nude mice bearing NCI-N87 xenograft. Data points represent group mean body weight.
• Figure 30: Body weight changes and tumor volume traces after administering BCY6136 to female Balb/c nude mice bearing SK-OV-3 xenograft. Data points represent group mean body weight.
• Figure 31: Body weight changes and tumor volume traces after administering BCY6136 to female Balb/c nude mice bearing OE21 xenograft. Data points represent group mean body weight.
• Figure 32: Body weight changes and tumor volume traces after administering BCY6136 to female CB17-SCID mice bearing MOLP-8 xenograft. Data points represent group mean body weight.
• Figure 33: Body weight changes and Tumor volume traces after administering BCY6082 to female CB17-SCID mice bearing MOLP-8 xenograft. Data points represent group mean body weight.
• Figures 34 to 42: Body weight changes and tumor volume traces after administering BCY6082 (Figure 34, BCY6031 (Figure 35), BCY6173 (Figure 36), BCY6135 (Figure 37), BCY6033 (Figure 38), BCY6136 (Figure 39), BCY6174 (Figure 40), BCY6175 (Figure 41) and ADC (Figure 42) to female BALB/c nude mice bearing HT1080 xenograft. Data points represent group mean body weight.

Where error bars are present in the above Figures, these represent standard error of the mean (SEM). DETAILED DESCRIPTION OF THE INVENTION

Provided herein is a compound, which compound is BCY6136 or a pharmaceutically acceptable salt thereof, wherein said compound BCY6136 has the structure:

• wherein BCY6099 is a polypeptide of SEQ ID NO: 2 (B-Ala)-Sar10-A(HArg)D-Ci(HyP)LVNPLCiiLHP(D-Asp)W(HArg)Ciii (SEQ ID NO: 2)
• wherein the polypeptide of SEQ ID NO: 2 is cyclised at Ci, Cii and Ciii with 1,1',1"-(1,3,5-triazinane-1,3,5-triyl)triprop-2-en-1-one (TATA).

The compound comprises a peptide ligand which has the following amino acid sequence: (β-Ala)-Sar₁₀-A(HArg)D-C_i(HyP)LVNPLC_iiLHP(D-Asp)W(HArg)C_iii (SEQ ID NO: 2) (BCY6099; Compound 66); wherein Sar is sarcosine, HArg is homoarginine and HyP is hydroxyproline.

The molecular scaffold is 1,1',1"-(1,3,5-triazinane-1,3,5-triyl)triprop-2-en-1-one (TATA) and the peptide ligand is: (β-Ala)-Sar₁₀-A(HArg)D-C_i(HyP)LVNPLC_iiLHP(D-Asp)W(HArg)C_iii (SEQ ID NO: 2); wherein Sar is sarcosine, HArg is homoarginine and HyP is hydroxyproline.

Therefore, the peptide ligand is Compound 66 (BCY6099) or a pharmaceutically acceptable salt thereof.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art, such as in the arts of peptide chemistry, cell culture and phage display, nucleic acid chemistry and biochemistry. Standard techniques are used for molecular biology, genetic and biochemical methods (see Sambrook et al., Molecular Cloning: A Laboratory Manual, 3rd ed., 2001, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY; Ausubel et al., Short Protocols in Molecular Biology (1999) 4th ed., John Wiley & Sons, Inc.).

Nomenclature Numbering

When referring to amino acid residue positions within the peptides of the invention, cysteine residues (C_i, C_ii and C_iii) are omitted from the numbering as they are invariant, therefore, the numbering of amino acid residues within the peptides of the invention is referred to as below: -C_i-HyP₁-L₂-V₃-N₄-P₅-L₆-C_ii-L₇-H₈-P₉-(D-Asp)₁₀-W₁₁-(HArg)₁₂-C_iii- (SEQ ID NO: 1).

For the purpose of this description, all bicyclic peptides are assumed to be cyclised with 1,1',1"-(1,3,5-triazinane-1,3,5-triyl)triprop-2-en-1-one (TATA) yielding a tri-substituted 1,1',1"-(1,3,5-triazinane-1,3,5-triyl)tripropan-1-one structure. Cyclisation with TATA occurs on C_i, C_ii, and C_iii.

Molecular Format

N- or C-terminal extensions to the bicycle core sequence are added to the left or right side of the sequence, separated by a hyphen. For example, an N-terminal (β-Ala)-Sar₁₀-Ala tail would be denoted as: (β-Ala)-Sar₁₀-A-(SEQ ID NO: X).

Inversed Peptide Sequences

In light of the disclosure in Nair et al (2003) J Immunol 170(3), 1362-1373, it is envisaged that the peptide sequences disclosed herein would also find utility in their retro-inverso form. For example, the sequence is reversed (i.e. N-terminus become C-terminus and vice versa) and their stereochemistry is likewise also reversed (i.e. D-amino acids become L-amino acids and vice versa).

Peptide Ligands

A peptide ligand, as referred to herein, refers to a peptide, peptidic or peptidomimetic covalently bound to a molecular scaffold. Typically, such peptides, peptidics or peptidomimetics comprise a peptide having natural or non-natural amino acids, two or more reactive groups (i.e. cysteine residues) which are capable of forming covalent bonds to the scaffold, and a sequence subtended between said reactive groups which is referred to as the loop sequence, since it forms a loop when the peptide, peptidic or peptidomimetic is bound to the scaffold. In the present case, the peptides, peptidics or peptidomimetics comprise at least three cysteine residues (referred to herein as C_i, C_ii and C_iii), and form at least two loops on the scaffold.

Advantages of the Peptide Ligands

Certain bicyclic peptides have a number of advantageous properties which enable them to be considered as suitable drug-like molecules for injection, inhalation, nasal, ocular, oral or topical administration. Such advantageous properties include:

• Species cross-reactivity. This is a typical requirement for preclinical pharmacodynamics and pharmacokinetic evaluation;
• Protease stability. Bicyclic peptide ligands should in most circumstances demonstrate stability to plasma proteases, epithelial ("membrane-anchored") proteases, gastric and intestinal proteases, lung surface proteases, intracellular proteases and the like. Protease stability should be maintained between different species such that a bicyclic peptide lead candidate can be developed in animal models as well as administered with confidence to humans;
• Desirable solubility profile. This is a function of the proportion of charged and hydrophilic versus hydrophobic residues and intra/inter-molecular H-bonding, which is important for formulation and absorption purposes;
• An optimal plasma half-life in the circulation. Depending upon the clinical indication and treatment regimen, it may be required to develop a bicyclic peptide with short or prolonged in vivo exposure times for the management of either chronic or acute disease states. The optimal exposure time will be governed by the requirement for sustained exposure (for maximal therapeutic efficiency) versus the requirement for short exposure times to minimise toxicological effects arising from sustained exposure to the agent;
• Selectivity. Certain peptide ligands demonstrate good selectivity over other Eph receptor tyrosine kinases, such as EphA1, EphA3, EphA4, EphA5, EphA6, EphA7 and EphB1 and factor XIIA, carbonic anhydrase 9 and CD38 (selectivity data for selected peptide ligands may be seen in Tables 7 and 14). It should also be noted that selected peptide ligands exhibit cross reactivity with other species (eg mouse and rat) to permit testing in animal models (Tables 3 to 6 and 15); and
• Safety. Bleeding events have been reported in pre-clinical in vivo models and clinical trials with EphA2 Antibody Drug Conjugates. For example, a phase 1, open-label study with MEDI-547 was halted due to bleeding and coagulation events that occurred in 5 of 6 patients (Annunziata et al, Invest New Drugs (2013) 31:77-84). The bleeding events observed in patients were consistent with effects on the coagulation system observed in rat and monkey pre-clinical studies: increased activated partial thromboplastin time and increased fibrinogen/fibrin degradation product (Annunziata et al IBID). Overt bleeding events were reportedly seen in toxicology studies in monkeys (Annunziata et al, IBID). Taken together these results imply that MEDI-547 causes Disseminated Intravascular Coagulation (DIC) in both preclinical species and patients. The BDCs reported here have short in vivo half lives (< 30 minutes) and are therefore intrinsically less likely to give rise to DIC in patients. Results shown here (see BIOLOGICAL DATA sections 5 and 6 and Table 20) demonstrate that selected Bicycle Drug Conjugates have no effect on coagulation parameters and gave rise to no bleeding events in pre-clinical studies.

Pharmaceutically Acceptable Salts

It will be appreciated that salt forms are within the scope of this invention, and references to peptide ligands include the salt forms of said ligands.

The salts of the present invention can be synthesized from the parent compound that contains a basic or acidic moiety by conventional chemical methods such as methods described in Pharmaceutical Salts: Properties, Selection, and Use, P. Heinrich Stahl (Editor), Camille G. Wermuth (Editor), ISBN: 3-90639-026-8, Hardcover, 388 pages, August 2002. Generally, such salts can be prepared by reacting the free acid or base forms of these compounds with the appropriate base or acid in water or in an organic solvent, or in a mixture of the two.

Acid addition salts (mono- or di-salts) may be formed with a wide variety of acids, both inorganic and organic. Examples of acid addition salts include mono- or di-salts formed with an acid selected from the group consisting of acetic, 2,2-dichloroacetic, adipic, alginic, ascorbic (e.g. L-ascorbic), L-aspartic, benzenesulfonic, benzoic, 4-acetamidobenzoic, butanoic, (+) camphoric, camphor-sulfonic, (+)-(1S)-camphor-10-sulfonic, capric, caproic, caprylic, cinnamic, citric, cyclamic, dodecylsulfuric, ethane-1,2-disulfonic, ethanesulfonic, 2-hydroxyethanesulfonic, formic, fumaric, galactaric, gentisic, glucoheptonic, D-gluconic, glucuronic (e.g. D-glucuronic), glutamic (e.g. L-glutamic), α-oxoglutaric, glycolic, hippuric, hydrohalic acids (e.g. hydrobromic, hydrochloric, hydriodic), isethionic, lactic (e.g. (+)-L-lactic, (±)-DL-lactic), lactobionic, maleic, malic, (-)-L-malic, malonic, (±)-DL-mandelic, methanesulfonic, naphthalene-2-sulfonic, naphthalene-1,5-disulfonic, 1-hydroxy-2-naphthoic, nicotinic, nitric, oleic, orotic, oxalic, palmitic, pamoic, phosphoric, propionic, pyruvic, L-pyroglutamic, salicylic, 4-amino-salicylic, sebacic, stearic, succinic, sulfuric, tannic, (+)-L-tartaric, thiocyanic, p-toluenesulfonic, undecylenic and valeric acids, as well as acylated amino acids and cation exchange resins.

One particular group of salts consists of salts formed from acetic, hydrochloric, hydriodic, phosphoric, nitric, sulfuric, citric, lactic, succinic, maleic, malic, isethionic, fumaric, benzenesulfonic, toluenesulfonic, sulfuric, methanesulfonic (mesylate), ethanesulfonic, naphthalenesulfonic, valeric, propanoic, butanoic, malonic, glucuronic and lactobionic acids. One particular salt is the hydrochloride salt. Another particular salt is the acetate salt.

If the compound is anionic, or has a functional group which may be anionic (e.g., -COOH may be -COO^-), then a salt may be formed with an organic or inorganic base, generating a suitable cation. Examples of suitable inorganic cations include, but are not limited to, alkali metal ions such as Li⁺, Na⁺ and K⁺, alkaline earth metal cations such as Ca²⁺ and Mg²⁺, and other cations such as Al³⁺ or Zn⁺. Examples of suitable organic cations include, but are not limited to, ammonium ion (i.e., NH₄ ⁺) and substituted ammonium ions (e.g., NH₃R⁺, NH₂R₂ ⁺, NHR₃ ⁺, NR₄ ⁺). Examples of some suitable substituted ammonium ions are those derived from: methylamine, ethylamine, diethylamine, propylamine, dicyclohexylamine, triethylamine, butylamine, ethylenediamine, ethanolamine, diethanolamine, piperazine, benzylamine, phenylbenzylamine, choline, meglumine, and tromethamine, as well as amino acids, such as lysine and arginine. An example of a common quaternary ammonium ion is N(CH₃)₄ ⁺.

Where the peptides of the invention contain an amine function, these may form quaternary ammonium salts, for example by reaction with an alkylating agent according to methods well known to the skilled person. Such quaternary ammonium compounds are within the scope of the peptides of the invention.

Modified Derivatives

In one embodiment, a modified derivative comprises an N-terminal and/or C-terminal modification. In a further embodiment, wherein the modified derivative comprises an N-terminal modification using suitable amino-reactive chemistry, and/or C-terminal modification using suitable carboxy-reactive chemistry. In a further embodiment, said N-terminal or C-terminal modification comprises addition of an effector group, including but not limited to a cytotoxic agent, a radiochelator or a chromophore.

In a further embodiment, a modified derivative comprises an N-terminal modification. In a further embodiment, the N-terminal modification comprises an N-terminal acetyl group. In this embodiment, the N-terminal residue is capped with acetic anhydride or other appropriate reagents during peptide synthesis leading to a molecule which is N-terminally acetylated. This embodiment provides the advantage of removing a potential recognition point for aminopeptidases and avoids the potential for degradation of the bicyclic peptide.

In an alternative embodiment, a N-terminal modification comprises the addition of a molecular spacer group which facilitates the conjugation of effector groups and retention of potency of the bicyclic peptide to its target.

In a further embodiment, a modified derivative comprises a C-terminal modification. In a further embodiment, the C-terminal modification comprises an amide group. In this embodiment, the C-terminal residue is synthesized as an amide during peptide synthesis leading to a molecule which is C-terminally amidated. This embodiment provides the advantage of removing a potential recognition point for carboxypeptidase and reduces the potential for proteolytic degradation of the bicyclic peptide.

Non-natural amino acids may be selected having isosteric/isoelectronic side chains which are neither recognised by degradative proteases nor have any adverse effect upon target potency.

Non-natural amino acids may have constrained amino acid side chains, such that proteolytic hydrolysis of the nearby peptide bond is conformationally and sterically impeded. In particular, these concern proline analogues, bulky sidechains, Ca-disubstituted derivatives (for example, aminoisobutyric acid, Aib), and cyclo amino acids, a simple derivative being aminocyclopropylcarboxylic acid.

In one embodiment, a modified derivative comprises the addition of a spacer group. In a further embodiment, the modified derivative comprises the addition of a spacer group to the N-terminal cysteine (C_i) and/or the C-terminal cysteine (C_iii).

Replacement of a tryptophan residue with a naphthylalanine or alanine residue provides the advantage of improving the pharmaceutical stability profile of the resultant bicyclic peptide ligand.

The correct balance of charged versus hydrophobic amino acid residues is an important characteristic of bicyclic peptide ligands. For example, hydrophobic amino acid residues influence the degree of plasma protein binding and thus the concentration of the free available fraction in plasma, while charged amino acid residues (in particular arginine) may influence the interaction of the peptide with the phospholipid membranes on cell surfaces. The two in combination may influence half-life, volume of distribution and exposure of the peptide drug, and can be tailored according to the clinical endpoint. In addition, the correct combination and number of charged versus hydrophobic amino acid residues may reduce irritation at the injection site (if the peptide drug has been administered subcutaneously).

Replacement of one or more L-amino acid residues with one or more D-amino acid residues is believed to increase proteolytic stability by steric hindrance and by a propensity of D-amino acids to stabilise β-turn conformations (Tugyi et al (2005) PNAS, 102(2), 413-418).

Removal of any amino acid residues and substitution with alanines, such as D-alanines provides the advantage of identifying key binding residues and removing potential proteolytic attack site(s).

It should be noted that each of the above mentioned modifications serve to deliberately improve the potency or stability of the peptide. Further potency improvements based on modifications may be achieved through the following mechanisms:

• Incorporating hydrophobic moieties that exploit the hydrophobic effect and lead to lower off rates, such that higher affinities are achieved;
• Incorporating charged groups that exploit long-range ionic interactions, leading to faster on rates and to higher affinities (see for example Schreiber et al, Rapid, electrostatically assisted association of proteins (1996), Nature Struct. Biol. 3, 427-31); and
• Incorporating additional constraint into the peptide, by for example constraining side chains of amino acids correctly such that loss in entropy is minimal upon target binding, constraining the torsional angles of the backbone such that loss in entropy is minimal upon target binding and introducing additional cyclisations in the molecule for identical reasons.

(for reviews see Gentilucci et al, Curr. Pharmaceutical Design, (2010), 16, 3185-203, and Nestor et al, Curr. Medicinal Chem (2009), 16, 4399-418). Isotopic variations

The present invention also discoses all pharmaceutically acceptable (radio)isotope-labeled peptide ligands, wherein one or more atoms are replaced by atoms having the same atomic number, but an atomic mass or mass number different from the atomic mass or mass number usually found in nature.

Examples of isotopes comprise isotopes of hydrogen, such as ²H (D) and ³H (T), carbon, such as ¹¹C, ¹³C and ¹⁴C, chlorine, such as ³⁶Cl, fluorine, such as ¹⁸F, iodine, such as ¹²³I, ¹²⁵I and ¹³¹I, nitrogen, such as ¹³N and ¹⁵N, oxygen, such as ¹⁵O, ¹⁷O and ¹⁸O, phosphorus, such as ³²P, sulfur, such as ³⁵S, copper, such as ⁶⁴Cu, gallium, such as ⁶⁷Ga or ⁶⁸Ga, yttrium, such as ⁹⁰Y and lutetium, such as ¹⁷⁷Lu, and Bismuth, such as ²¹³Bi.

Certain isotopically-labelled peptide ligands, for example, those incorporating a radioactive isotope, are useful in drug and/or substrate tissue distribution studies, and to clinically assess the presence and/or absence of the EphA2 target on diseased tissues. The peptide ligands can further have valuable diagnostic properties in that they can be used for detecting or identifying the formation of a complex between a labelled compound and other molecules, peptides, proteins, enzymes or receptors. The detecting or identifying methods can use compounds that are labelled with labelling agents such as radioisotopes, enzymes, fluorescent substances, luminous substances (for example, luminol, luminol derivatives, luciferin, aequorin and luciferase), etc. The radioactive isotopes tritium, i.e. ³H (T), and carbon-14, i.e. ¹⁴C, are particularly useful for this purpose in view of their ease of incorporation and ready means of detection.

Substitution with heavier isotopes such as deuterium, i.e. ²H (D), may afford certain therapeutic advantages resulting from greater metabolic stability, for example, increased in vivo half-life or reduced dosage requirements, and hence may be preferred in some circumstances.

Substitution with positron emitting isotopes, such as ¹¹C, ¹⁸F, ¹⁵O and ¹³N, can be useful in Positron Emission Topography (PET) studies for examining target occupancy.

Isotopically-labeled compounds of the invention can generally be prepared by conventional techniques known to those skilled in the art or by processes analogous to those described in the accompanying Examples using an appropriate isotopically-labeled reagent in place of the non-labeled reagent previously employed.

Non-Aromatic Molecular scaffold

References herein to the term "non-aromatic molecular scaffold" refer to any molecular scaffold as defined herein which does not contain an aromatic (i.e. unsaturated) carbocyclic or heterocyclic ring system.

Suitable examples of non-aromatic molecular scaffolds are described in Heinis et al (2014) Angewandte Chemie, International Edition 53(6) 1602-1606.

As noted in the foregoing documents, a molecular scaffold may be a small molecule, such as a small organic molecule.

A molecular scaffold may be a macromolecule. A molecular scaffold may be a macromolecule composed of amino acids, nucleotides or carbohydrates.

A molecular scaffold may comprise reactive groups that are capable of reacting with functional group(s) of the polypeptide to form covalent bonds.

A molecular scaffold may comprise chemical groups which form the linkage with a peptide, such as amines, thiols, alcohols, ketones, aldehydes, nitriles, carboxylic acids, esters, alkenes, alkynes, azides, anhydrides, succinimides, maleimides, alkyl halides and acyl halides.

An example of an α unsaturated carbonyl containing compound is 1,1',1"-(1,3,5-triazinane-1,3,5-triyl)triprop-2-en-1-one (TATA) (Angewandte Chemie, International Edition (2014), 53(6), 1602-1606).

Effector and Functional Groups

Effector and/or functional groups can be attached, for example, to the N and/or C termini of a polypeptide, to an amino acid within a polypeptide, or to a molecular scaffold.

Appropriate effector groups include antibodies and parts or fragments thereof. For instance, an effector group can include an antibody light chain constant region (CL), an antibody CH1 heavy chain domain, an antibody CH2 heavy chain domain, an antibody CH3 heavy chain domain, or any combination thereof, in addition to the one or more constant region domains. An effector group may also comprise a hinge region of an antibody (such a region normally being found between the CH1 and CH2 domains of an IgG molecule).

An effector group may be an Fc region of an IgG molecule. Advantageously, a peptide ligand-effector group may comprise or consist of a peptide ligand Fc fusion having a tβ half-life of a day or more, two days or more, 3 days or more, 4 days or more, 5 days or more, 6 days or more or 7 days or more. Most advantageously, a peptide ligand may comprise or consist of a peptide ligand Fc fusion having a tβ half-life of a day or more.

Functional groups include, in general, binding groups, drugs, reactive groups for the attachment of other entities, functional groups which aid uptake of the macrocyclic peptides into cells, and the like.

The ability of peptides to penetrate into cells will allow peptides against intracellular targets to be effective. Targets that can be accessed by peptides with the ability to penetrate into cells include transcription factors, intracellular signalling molecules such as tyrosine kinases and molecules involved in the apoptotic pathway. Functional groups which enable the penetration of cells include peptides or chemical groups which have been added either to the peptide or the molecular scaffold. Peptides such as those derived from such as VP22, HIV-Tat, a homeobox protein of Drosophila (Antennapedia), e.g. as described in Chen and Harrison, Biochemical Society Transactions (2007) Volume 35, part 4, p821; Gupta et al. in Advanced Drug Discovery Reviews (2004) Volume 57 9637. Examples of short peptides which have been shown to be efficient at translocation through plasma membranes include the 16 amino acid penetratin peptide from Drosophila Antennapedia protein ( Derossi et al (1994) J Biol. Chem. Volume 269 p10444), the 18 amino acid 'model amphipathic peptide' (Oehlke et al (1998) Biochim Biophys Acts Volume 1414 p127) and arginine rich regions of the HIV TAT protein. Non peptidic approaches include the use of small molecule mimics or SMOCs that can be easily attached to biomolecules (Okuyama et al (2007) Nature Methods Volume 4 p153). Other chemical strategies to add guanidinium groups to molecules also enhance cell penetration (Elson-Scwab et al (2007) J Biol Chem Volume 282 p13585). Small molecular weight molecules such as steroids may be added to the molecular scaffold to enhance uptake into cells.

One class of functional groups which may be attached to peptide ligands includes antibodies and binding fragments thereof, such as Fab, Fv or single domain fragments. In particular, antibodies which bind to proteins capable of increasing the half-life of the peptide ligand in vivo may be used.

A peptide ligand-effector group may have a tβ half-life selected from the group consisting of: 12 hours or more, 24 hours or more, 2 days or more, 3 days or more, 4 days or more, 5 days or more, 6 days or more, 7 days or more, 8 days or more, 9 days or more, 10 days or more, 11 days or more, 12 days or more, 13 days or more, 14 days or more, 15 days or more or 20 days or more. Advantageously a peptide ligand-effector group or composition may have a tβ range 12 to 60 hours. It may have a tβ half-life of a day or more. It may be in the range 12 to 26 hours.

A functional group may be selected from a metal chelator, which is suitable for complexing metal radioisotopes of medicinal relevance.

Possible effector groups also include enzymes, for instance such as carboxypeptidase G2 for use in enzyme/prodrug therapy, where the peptide ligand replaces antibodies in ADEPT.

A functional group may be a drug, such as a cytotoxic agent for cancer therapy. Suitable examples include: alkylating agents such as cisplatin and carboplatin, as well as oxaliplatin, mechlorethamine, cyclophosphamide, chlorambucil, ifosfamide; Anti-metabolites including purine analogs azathioprine and mercaptopurine or pyrimidine analogs; plant alkaloids and terpenoids including vinca alkaloids such as Vincristine, Vinblastine, Vinorelbine and Vindesine; Podophyllotoxin and its derivatives etoposide and teniposide; Taxanes, including paclitaxel, originally known as Taxol; topoisomerase inhibitors including camptothecins: irinotecan and topotecan, and type II inhibitors including amsacrine, etoposide, etoposide phosphate, and teniposide. Further agents can include antitumour antibiotics which include the immunosuppressant dactinomycin (which is used in kidney transplantations), doxorubicin, epirubicin, bleomycin, calicheamycins, and others.

Cytotoxic agents include maytansinoids (such as DM1) or monomethyl auristatins (such as MMAE).

DM1 is a cytotoxic agent which is a thiol-containing derivative of maytansine and has the following structure:

Monomethyl auristatin E (MMAE) is a synthetic antineoplastic agent and has the following structure:

The compound provided herein comprises MMAE. The compound is BCY6136 or a pharmaceutically acceptable salt thereof, wherein said compound BCY6136 has the structure:

• wherein BCY6099 is a polypeptide of SEQ ID NO: 2 (B-Ala)-Sar10-A(HArg)D-Ci(HyP)LVNPLCiiLHP(D-Asp)W(HArg)Ciii (SEQ ID NO: 2)
• wherein Sar is sarcosine, HArg is homoarginine and HyP is hydroxyproline;
• wherein the polypeptide of SEQ ID NO: 2 is cyclised at Ci, Cii and Ciii with 1,1',1"-(1,3,5-triazinane-1,3,5-triyl)triprop-2-en-1-one (TATA).

Data is presented herein in Table 6 which demonstrates the effects of peptide ligands conjugated to toxins containing DM1.

Data is presented herein which demonstrates excellent competition binding for BCY6027 in the EphA2 competition binding assay as shown in Table 6.

Data is presented herein which demonstrates excellent competition binding for BCY6028 in the EphA2 competition binding assay as shown in Table 6.

Data is presented herein which demonstrates excellent competition binding for BCY6031 in the EphA2 competition binding assay as shown in Table 6. Data is also presented herein in Table 11 and Figures 1 and 2 which demonstrate that BCY6031 treatment completely eradicated non-small cell lung carcinomas from day 32 and no tumour regrowth occurred following dosing suspension on day 28.

Data is presented herein which demonstrates excellent competition binding for BCY6032 in the EphA2 competition binding assay as shown in Table 6.

The provided compound is listed in Table 11. Data is presented herein which shows that these BDCs exhibited excellent cross reactivity between human, mouse and rodent EphA2 as shown in Table 11.

The compound is listed in Table 13.

The compound is BCY6136. Data is presented herein which shows that this compound exhibited no significant binding to: closely related human homologs EphA1, EphA3, EphA4, EphA5, EphA6, EphA7 and EphB4; mouse EphA3 and EphA4; and rat EphA3 and EphB1 as shown in Tables 14 and 15.

The drug conjugate is BCY6136. Data is presented herein in Studies 7 and 8 which show that BCY6136 showed significant and potent anti-tumor activity in the PC-3 xenograft prostate cancer model (see Figures 7 to 10 and Tables 21 to 24). Data is also provided herein which show that BCY6136 demonstrated potent antitumor activity in the NCI-H1975 xenograft lung cancer (NSCLC) model (see Figures 11 to 13 and Tables 25 to 30). Data is also presented herein in Studies 10 and 11 which show that BCY6136 demonstrated potent anti-tumor effect in both large and small tumour size LU-01-0251 PDX lung cancer (NSCLC) models (see Figures 14 and 15 and Tables 31 to 34) wherein complete tumor regression was observed. Data is also presented herein in Study 12 which show that BCY6136 demonstrated significant anti-tumor effect in the LU-01-0046 PDX lung cancer (NSCLC) model (see Figure 16 and Tables 35 and 36) wherein complete tumor regression was observed for BCY6136. Data is also presented herein in Study 13 which show that BCY6136 demonstrated dose dependent anti-tumor activity in the LU-01-0046 PDX lung cancer (NSCLC) model (see Figure 17 and Tables 37 and 38). Data is also presented herein in Study 14 which show BCY6136 eradicated tumors in the LU-01-0046 PDX lung cancer (NSCLC) model (see Figures 18 to 22 and Tables 39 to 42). Data is also presented herein in Studies 15 and 16 which demonstrate the effects of BCY6136 in two models which make use of cell lines with low/negligible EphA2 expression (namely Lu-01-0412 and Lu-01-0486). This data is shown in Figures 23 and 24 and Tables 43 to 46 and demonstrate that BCY6136 had no effect upon tumor regression in either cell line but BCYs BCY8245 and BCY8781, which bind to a target highly expressed in the Lu-01-0412 cell line, completely eradicated the tumour. Data is presented herein in Study 17 which show that BCY6136 demonstrated potent antitumor activity in the MDA-MB-231 xenograft breast cancer model (see Figures 25 to 27 and Tables 47 to 50). Data is also presented herein in Study 18 which demonstrates the effects of BCY6136 in a breast cancer model which makes use of a cell line with low/negligible EphA2 expression (namely EMT6). This data is shown in Figure 28 and Tables 51 and 52 and demonstrates that BCY6136 had no effect upon tumor regression in this cell line. Data is also presented herein in Study 19 which show that BCY6136 demonstrated significant antitumor activity in the NCI-N87 xenograft gastric cancer model (see Figure 29 and Tables 53 and 54). Data is also presented herein in Study 20 which show that BCY6136 demonstrated significant antitumor activity in the SK-OV-3 xenograft ovarian cancer model (see Figure 30 and Tables 55 and 56) compared with the ADC MEDI-547 which demonstrated moderate antitumour activity. Data is also presented herein in Study 21 which show that BCY6136 demonstrated significant antitumor activity in the OE-21 xenograft oesophageal cancer model (see Figure 31 and Tables 57 and 58). Data is also presented herein in Study 22 which show that BCY6136 demonstrated dose-dependent antitumor activity in the MOLP-8 xenograft multiple myeloma model and BCY6082 demonstrated significant antitumor activity (see Figures 32 and 33 and Tables 59 and 60). Data is also presented herein in Study 23 which show that BCY6136 demonstrated potent antitumor activity in the HT-1080 xenograft fibrosarcoma model (see Figures 34 to 41 and Tables 61 and 62).

Synthesis

The peptides of the present invention may be manufactured synthetically by standard techniques followed by reaction with a molecular scaffold in vitro. When this is performed, standard chemistry may be used. This enables the rapid large scale preparation of soluble material for further downstream experiments or validation. Such methods could be accomplished using conventional chemistry such as that disclosed in Timmerman et al (supra).

The manufacture may comprise optional further steps as explained below. These steps may be carried out on the end product polypeptide/conjugate made by chemical synthesis.

Optionally amino acid residues in a polypeptide of interest may be substituted when manufacturing a conjugate or complex.

Peptides can also be extended, to incorporate for example another loop and therefore introduce multiple specificities.

To extend a peptide, it may simply be extended chemically at its N-terminus or C-terminus or within the loops using orthogonally protected lysines (and analogues) using standard solid phase or solution phase chemistry. Standard (bio)conjugation techniques may be used to introduce an activated or activatable N- or C-terminus. Alternatively additions may be made by fragment condensation or native chemical ligation e.g. as described in (Dawson et al. 1994. Synthesis of Proteins by Native Chemical Ligation. Science 266:776-779), or by enzymes, for example using subtiligase as described in (Chang et al Proc Natl Acad Sci U S A. 1994 Dec 20; 91(26):12544-8 or in Hikari et al Bioorganic & Medicinal Chemistry Letters Volume 18, Issue 22, 15 November 2008, Pages 6000-6003).

Alternatively, peptides may be extended or modified by further conjugation through disulphide bonds. This has the additional advantage of allowing the first and second peptide to dissociate from each other once within the reducing environment of the cell. In this case, the molecular scaffold could be added during the chemical synthesis of the first peptide so as to react with the three cysteine groups; a further cysteine or thiol could then be appended to the N or C-terminus of the first peptide, so that this cysteine or thiol only reacted with a free cysteine or thiol of the second peptide, forming a disulfide -linked bicyclic peptidepeptide conjugate.

Similar techniques apply equally to the synthesis/coupling of two bicyclic and bispecific macrocycles, potentially creating a tetraspecific molecule.

Furthermore, addition of other functional groups or effector groups may be accomplished in the same manner, using appropriate chemistry, coupling at the N- or C-termini or via side chains. In one embodiment, the coupling is conducted in such a manner that it does not block the activity of either entity.

Pharmaceutical Compositions

According to a further aspect of the invention, there is provided a pharmaceutical composition comprising a drug conjugate as defined herein in combination with one or more pharmaceutically acceptable excipients.

Generally, the provided compound will be utilised in purified form together with pharmacologically appropriate excipients or carriers. Typically, these excipients or carriers include aqueous or alcoholic/aqueous solutions, emulsions or suspensions, including saline and/or buffered media. Parenteral vehicles include sodium chloride solution, Ringer's dextrose, dextrose and sodium chloride and lactated Ringer's. Suitable physiologicallyacceptable adjuvants, if necessary to keep a polypeptide complex in suspension, may be chosen from thickeners such as carboxymethylcellulose, polyvinylpyrrolidone, gelatin and alginates.

Intravenous vehicles include fluid and nutrient replenishers and electrolyte replenishers, such as those based on Ringer's dextrose. Preservatives and other additives, such as antimicrobials, antioxidants, chelating agents and inert gases, may also be present (Mack (1982) Remington's Pharmaceutical Sciences, 16th Edition).

The compound of the present invention may be used as separately administered compositions or in conjunction with other agents. These can include antibodies, antibody fragments and various immunotherapeutic drugs, such as cylcosporine, methotrexate, adriamycin or cisplatinum and immunotoxins. Pharmaceutical compositions can include "cocktails" of various cytotoxic or other agents in conjunction with the protein ligands of the present invention, or even combinations of selected polypeptides according to the present invention having different specificities, such as polypeptides selected using different target ligands, whether or not they are pooled prior to administration.

The route of administration of pharmaceutical compositions according to the invention may be any of those commonly known to those of ordinary skill in the art. For therapy, the peptide ligands of the invention can be administered to any patient in accordance with standard techniques. The administration can be by any appropriate mode, including parenterally, intravenously, intramuscularly, intraperitoneally, transdermally, via the pulmonary route, or also, appropriately, by direct infusion with a catheter. Preferably, the pharmaceutical compositions according to the invention will be administered by inhalation. The dosage and frequency of administration will depend on the age, sex and condition of the patient, concurrent administration of other drugs, counterindications and other parameters to be taken into account by the clinician.

The compound of this invention can be lyophilised for storage and reconstituted in a suitable carrier prior to use. This technique has been shown to be effective and art-known lyophilisation and reconstitution techniques can be employed. It will be appreciated by those skilled in the art that lyophilisation and reconstitution can lead to varying degrees of activity loss and that levels may have to be adjusted upward to compensate.

The compositions containing the present compoundor a cocktail thereof can be administered for prophylactic and/or therapeutic treatments. In certain therapeutic applications, an adequate amount to accomplish at least partial inhibition, suppression, modulation, killing, or some other measurable parameter, of a population of selected cells is defined as a "therapeutically-effective dose". Amounts needed to achieve this dosage will depend upon the severity of the disease and the general state of the patient's own immune system, but generally range from 0.005 to 5.0 mg of selected peptide ligand per kilogram of body weight, with doses of 0.05 to 2.0 mg/kg/dose being more commonly used. For prophylactic applications, compositions containing the present compound or cocktails thereof may also be administered in similar or slightly lower dosages.

A composition containing a compound according to the present invention may be utilised in prophylactic and therapeutic settings to aid in the alteration, inactivation, killing or removal of a select target cell population in a mammal. In addition, the compounddescribed herein may be used extracorporeally or in vitro selectively to kill, deplete or otherwise effectively remove a target cell population from a heterogeneous collection of cells. Blood from a mammal may be combined extracorporeally with the selected peptide ligands whereby the undesired cells are killed or otherwise removed from the blood for return to the mammal in accordance with standard techniques.

Therapeutic Uses

The compound of the invention has specific utility as an EphA2 binding agent.

Eph receptor tyrosine kinases (Ephs) belong to a large group of receptor tyrosine kinases (RTKs), kinases that phosphorylate proteins on tyrosine residues. Ephs and their membrane bound ephrin ligands (ephrins) control cell positioning and tissue organization (Poliakov et al. (2004) Dev Cell 7, 465-80). Functional and biochemical Eph responses occur at higher ligand oligomerization states (Stein et al. (1998) Genes Dev 12, 667-678).

Among other patterning functions, various Ephs and ephrins have been shown to play a role in vascular development. Knockout of EphB4 and ephrin-B2 results in a lack of the ability to remodel capillary beds into blood vessels (Poliakov et al., supra) and embryonic lethality. Persistent expression of some Eph receptors and ephrins has also been observed in newlyformed, adult micro-vessels (Brantley-Sieders et al. (2004) Curr Pharm Des 10, 3431-42; Adams (2003) J Anat 202, 105-12).

The de-regulated re-emergence of some ephrins and their receptors in adults also has been observed to contribute to tumor invasion, metastasis and neo-angiogenesis (Nakamoto et al. (2002) Microsc Res Tech 59, 58-67; Brantley-Sieders et al., supra). Furthermore, some Eph family members have been found to be over-expressed on tumor cells from a variety of human tumors (Brantley-Sieders et al., supra); Marme (2002) Ann Hematol 81 Suppl 2, S66; Booth et al. (2002) Nat Med 8, 1360-1).

EPH receptor A2 (ephrin type-A receptor 2) is a protein that in humans is encoded by the EPHA2 gene.

EphA2 is upregulated in multiple cancers in man, often correlating with disease progression, metastasis and poor prognosis e.g.: breast (Zelinski et al (2001) Cancer Res. 61, 2301-2306; Zhuang et al (2010) Cancer Res. 70, 299-308; Brantley-Sieders et al (2011) PLoS One 6, e24426), lung (Brannan et al (2009) Cancer Prev Res (Phila) 2, 1039-1049; Kinch et al (2003) Clin Cancer Res. 9, 613-618; Guo et al (2013) J Thorac Oncol. 8, 301-308), gastric (Nakamura et al (2005) Cancer Sci. 96, 42-47; Yuan et al (2009) Dig Dis Sci 54, 2410-2417), pancreatic (Mudali et al (2006) Clin Exp Metastasis 23, 357-365), prostate ( Walker-Daniels et al (1999) Prostate 41, 275-280), liver (Yang et al (2009) Hepatol Res. 39, 1169-1177) and glioblastoma (Wykosky et al (2005) Mol Cancer Res. 3, 541-551; Li et al (2010) Tumour Biol. 31, 477-488).

The full role of EphA2 in cancer progression is still not defined although there is evidence for interaction at numerous stages of cancer progression including tumour cell growth, survival, invasion and angiogenesis. Downregulation of EphA2 expression suppresses tumour cancer cell propagation (Binda et al (2012) Cancer Cell 22, 765-780), whilst EphA2 blockade inhibits VEGF induced cell migration (Hess et al (2001) Cancer Res. 61, 3250-3255), sprouting and angiogenesis (Cheng et al (2002) Mol Cancer Res. 1, 2-11; Lin et al (2007) Cancer 109, 332-40) and metastatic progression (Brantley-Sieders et al (2005) FASEB J. 19, 1884-1886).

An antibody drug conjugate to EphA2 has been shown to significantly diminish tumour growth in rat and mouse xenograft models (Jackson et al (2008) Cancer Research 68, 9367-9374) and a similar approach has been tried in man although treatment had to be discontinued for treatment related adverse events (Annunziata et al (2013) Invest New drugs 31, 77-84).

The compound of the present invention may be employed in in vivo therapeutic and prophylactic applications, in vitro and in vivo diagnostic applications, in vitro assay and reagent applications, and the like. Ligands having selected levels of specificity are useful in applications which involve testing in non-human animals, where cross-reactivity is desirable, or in diagnostic applications, where cross-reactivity with homologues or paralogues needs to be carefully controlled. In some applications, such as vaccine applications, the ability to elicit an immune response to predetermined ranges of antigens can be exploited to tailor a vaccine to specific diseases and pathogens.

Substantially pure peptide ligands of at least 90 to 95% homogeneity are preferred for administration to a mammal, and 98 to 99% or more homogeneity is most preferred for pharmaceutical uses, especially when the mammal is a human. Once purified, partially or to homogeneity as desired, the selected polypeptides may be used diagnostically or therapeutically (including extracorporeally) or in developing and performing assay procedures, immunofluorescent stainings and the like (Lefkovite and Pernis, (1979 and 1981) Immunological Methods, Volumes I and II, Academic Press, NY).

According to a further aspect of the invention, there is provided a drug conjugate as defined herein, for use in preventing, suppressing or treating a disease or disorder characterised by overexpression of EphA2 in diseased tissue (such as a tumour).

In one embodiment, the EphA2 is mammalian EphA2. In a further embodiment, the mammalian EphA2 is human EphA2.

In one embodiment, the disease or disorder characterised by overexpression of EphA2 in diseased tissue is selected from cancer.

Examples of cancers (and their benign counterparts) which may be treated (or inhibited) include, but are not limited to tumours of epithelial origin (adenomas and carcinomas of various types including adenocarcinomas, squamous carcinomas, transitional cell carcinomas and other carcinomas) such as carcinomas of the bladder and urinary tract, breast, gastrointestinal tract (including the esophagus, stomach (gastric), small intestine, colon, rectum and anus), liver (hepatocellular carcinoma), gall bladder and biliary system, exocrine pancreas, kidney, lung (for example adenocarcinomas, small cell lung carcinomas, non-small cell lung carcinomas, bronchioalveolar carcinomas and mesotheliomas), head and neck (for example cancers of the tongue, buccal cavity, larynx, pharynx, nasopharynx, tonsil, salivary glands, nasal cavity and paranasal sinuses), ovary, fallopian tubes, peritoneum, vagina, vulva, penis, cervix, myometrium, endometrium, thyroid (for example thyroid follicular carcinoma), adrenal, prostate, skin and adnexae (for example melanoma, basal cell carcinoma, squamous cell carcinoma, keratoacanthoma, dysplastic naevus); haematological malignancies (i.e. leukemias, lymphomas) and premalignant haematological disorders and disorders of borderline malignancy including haematological malignancies and related conditions of lymphoid lineage (for example acute lymphocytic leukemia [ALL], chronic lymphocytic leukemia [CLL], B-cell lymphomas such as diffuse large B-cell lymphoma [DLBCL], follicular lymphoma, Burkitt's lymphoma, mantle cell lymphoma, T-cell lymphomas and leukaemias, natural killer [NK] cell lymphomas, Hodgkin's lymphomas, hairy cell leukaemia, monoclonal gammopathy of uncertain significance, plasmacytoma, multiple myeloma, and post-transplant lymphoproliferative disorders), and haematological malignancies and related conditions of myeloid lineage (for example acute myelogenousleukemia [AML], chronic myelogenousleukemia [CML], chronic myelomonocyticleukemia [CMML], hypereosinophilic syndrome, myeloproliferative disorders such as polycythaemia vera, essential thrombocythaemia and primary myelofibrosis, myeloproliferative syndrome, myelodysplastic syndrome, and promyelocyticleukemia); tumours of mesenchymal origin, for example sarcomas of soft tissue, bone or cartilage such as osteosarcomas, fibrosarcomas, chondrosarcomas, rhabdomyosarcomas,leiomyosarcomas, liposarcomas, angiosarcomas, Kaposi's sarcoma, Ewing's sarcoma, synovial sarcomas, epithelioid sarcomas, gastrointestinal stromal tumours, benign and malignant histiocytomas, and dermatofibrosarcomaprotuberans; tumours of the central or peripheral nervous system (for example astrocytomas, gliomas and glioblastomas, meningiomas, ependymomas, pineal tumours and schwannomas); endocrine tumours (for example pituitary tumours, adrenal tumours, islet cell tumours, parathyroid tumours, carcinoid tumours and medullary carcinoma of the thyroid); ocular and adnexal tumours (for example retinoblastoma); germ cell and trophoblastic tumours (for example teratomas, seminomas, dysgerminomas, hydatidiform moles and choriocarcinomas); and paediatric and embryonal tumours (for example medulloblastoma, neuroblastoma, Wilms tumour, and primitive neuroectodermal tumours); or syndromes, congenital or otherwise, which leave the patient susceptible to malignancy (for example Xeroderma Pigmentosum).

In a further embodiment, the cancer is selected from: breast cancer, lung cancer, gastric cancer, pancreatic cancer, prostate cancer, liver cancer, glioblastoma and angiogenesis.

In a further embodiment, the cancer is selected from: prostate cancer, lung cancer (such as non-small cell lung carcinomas (NSCLC)), breast cancer (such as triple negative breast cancer), gastric cancer, ovarian cancer, oesophageal cancer, multiple myeloma and fibrosarcoma.

In a yet further embodiment, the cancer is prostate cancer. Data is presented herein in Studies 7 and 8 which show that BCY6033 and BCY6136 showed significant and potent anti-tumor activity in the PC-3 xenograft prostate cancer model (see Figures 7 to 10 and Tables 21 to 24).

In a yet further embodiment, the drug conjugate is useful for preventing, suppressing or treating solid tumours such as fibrosarcomas and breast, and non-small cell lung carcinomas.

In a yet further embodiment, the cancer is selected from lung cancer, such as non-small cell lung carcinomas (NSCLC). Data is presented herein which demonstrates that BCY6031 completely eradicated non-small cell lung carcinomas from day 32 and no tumour regrowth occurred following dosing suspension on day 28. This data clearly demonstrates the clinical utility of BDCs in cancers such as lung cancers, in particular non-small cell lung carcinomas. Data is also presented herein in Study 9 which show that BCY6033 demonstrated dose dependent anti-tumor activity, BCY6082 demonstrated significant antitumor activity and BCY6136 demonstrated potent antitumor activity in the NCI-H1975 xenograft lung cancer (NSCLC) model (see Figures 11 to 13 and Tables 25 to 30). Data is also presented herein in Studies 10 and 11 which show that BCY6136 demonstrated potent anti-tumor effect in both large and small tumour size LU-01-0251 PDX lung cancer (NSCLC) models (see Figures 14 and 15 and Tables 31 to 34) wherein complete tumor regression was observed. Data is also presented herein in Study 12 which show that BCY6033, BCY6136, BCY6082 and BCY6031 demonstrated significant anti-tumor effect in the LU-01-0046 PDX lung cancer (NSCLC) model (see Figure 16 and Tables 35 and 36) wherein complete tumor regression was observed for BCY6033 and BCY6136. Data is also presented herein in Study 13 which show that BCY6136 demonstrated dose dependent anti-tumor activity in the LU-01-0046 PDX lung cancer (NSCLC) model (see Figure 17 and Tables 37 and 38). Data is also presented herein in Study 14 which show that BCY6082 demonstrated dose dependent antitumor activity, BCY6031 and BCY6173 demonstrated antitumor activity and BCY6033, BCY6136 and BCY6175 eradicated tumors in the LU-01-0046 PDX lung cancer (NSCLC) model (see Figures 18 to 22 and Tables 39 to 42). Data is also presented herein in Studies 15 and 16 which demonstrate the effects of BCY6136 in two models which make use of cell lines with low/negligible EphA2 expression (namely Lu-01-0412 and Lu-01-0486). This data is shown in Figures 23 and 24 and Tables 43 to 46 and demonstrate that BCY6136 had no effect upon tumor regression in either cell line but BCYs BCY8245 and BCY8781, which bind to a target highly expressed in the Lu-01-0412 cell line, completely eradicated the tumour.In a further embodiment, the cancer is breast cancer. In a yet further embodiment, the breast cancer is triple negative breast cancer. Data is presented herein in Study 17 which show that BCY6082 demonstrated anti-tumor activity, BCY6033 demonstrated dose dependent antitumor activity and BCY6136 demonstrated potent antitumor activity in the MDA-MB-231 xenograft breast cancer model (see Figures 25 to 27 and Tables 47 to 50). Data is also presented herein in Study 18 which demonstrates the effects of BCY6136 in a breast cancer model which makes use of a cell line with low/negligible EphA2 expression (namely EMT6). This data is shown in Figure 28 and Tables 51 and 52 and demonstrates that BCY6136 had no effect upon tumor regression in this cell line. In an alternative embodiment, the breast cancer is Herceptin resistant breast cancer. Without being bound by theory, EphA2 is believed to be implicated in the resistance to Herceptin, therefore, an EphA2-targeting entity has potential utility in patients who have failed to respond to Herceptin.

In a further embodiment, the cancer is gastric cancer. Data is presented herein in Study 19 which show that BCY6136 demonstrated significant antitumor activity in the NCI-N87 xenograft gastric cancer model (see Figure 29 and Tables 53 and 54).

In a further embodiment, the cancer is ovarian cancer. Data is presented herein in Study 20 which show that BCY6136 demonstrated significant antitumor activity in the SK-OV-3 xenograft ovarian cancer model (see Figure 30 and Tables 55 and 56) compared with the ADC MEDI-547 which demonstrated moderate antitumour activity.

In a further embodiment, the cancer is oesophageal cancer. Data is presented herein in Study 21 which show that BCY6136 demonstrated significant antitumor activity in the OE-21 xenograft oesophageal cancer model (see Figure 31 and Tables 57 and 58).

In a further embodiment, the cancer is multiple myeloma. Data is presented herein in Study 22 which show that BCY6136 demonstrated dose-dependent antitumor activity in the MOLP-8 xenograft multiple myeloma model and BCY6082 demonstrated significant antitumor activity (see Figures 32 and 33 and Tables 59 and 60).

In a further embodiment, the cancer is fibrosarcoma. Data is presented herein in Study 23 which show that BCY6173, BCY6135, BCY6174 and BCY6175 demonstrated dose dependent antitumor activity and BCY6082, BCY6031, BCY6033 and BCY6136 demonstrated potent antitumor activity in the HT-1080 xenograft fibrosarcoma model (see Figures 34 to 41 and Tables 61 and 62).

References herein to the term "prevention" involves administration of the protective composition prior to the induction of the disease. "Suppression" refers to administration of the composition after an inductive event, but prior to the clinical appearance of the disease. "Treatment" involves administration of the protective composition after disease symptoms become manifest.

Animal model systems which can be used to screen the effectiveness of the peptide ligands in protecting against or treating the disease are available. The use of animal model systems is facilitated by the present invention, which allows the development of polypeptide ligands which can cross react with human and animal targets, to allow the use of animal models.

Furthermore, data is presented herein which demonstrates an association between copy number variation (CNV) and gene expression for EphA2 from multiple tumor types. Thus, according to a further aspect of the invention, there is provided a compound as provided herein, for use in a method of preventing, suppressing or treating cancer in a patient in need thereof, wherein said patient is identified as having an increased copy number variation (CNV) of EphA2.

In one embodiment, the cancer is selected from those identified herein as having increased CNV of EphA2. In a further embodiment, the cancer is breast cancer.

The invention is further described below with reference to the following examples. Examples falling outside the scope of the claims are provided for reference.

Examples

1Nal	1-Naphthylalanine	Fmoc-3-(1-naphthyl)-L-alanine	96402-49-2	Fluorochem
2FuAla	2-Furylalanine	Fmoc-L-2-furylalanine	159611-02-6	Combi Blocks
2Nal	2-Naphthylalanine	Fmoc-3-(2-naphthyl)-L-alanine	112883-43-9	Alfa Aesar
3,3-DPA	3,3-Diphenylalanine	fmoc-3,3-diphenylalanine	189937-46-0	Alfa Aesar
3,4-DCPhe	3,4-Dichlorophenylalani ne	Fmoc-3,4-dichloro-L-phenylalanine	17766-59-5	PolyPeptide
3Pal	3-(3-Pyridyl)-Alanine	N-Fmoc-3-(3-pyridyl)-Lβnine	175453-07-3	Fluorochem
4,4-BPA	4,4'-Biphenylalanine	Fmoc-L-4, 4'-Biphenylalanine	199110-64-0	Alfa Aesar
4BenzylPro	4-Benzyl-pyrrolidine-2-carboxylic acid	Fmoc-4-Benzyl-pyrrolidine-2-carboxylic acid	PolyPeptide
4BrPhe	4-Bromophenylalanin e	Fmoc-4-Bromo-L-phenylalanine	198561-04-5	PolyPeptide
4FIPro	4-Fluoro-pyrrolidine-2-carboxylic acid	Fmoc-4-fluoro-pyrrolidine-2-carboxylic acid	203866-19-7	PolyPeptide
4MeoPhe	4-Methoxyphenylalani ne	Fmoc-4-Methoxyphenylalanine	77128-72-4	Iris Biotech
4Pal	3-(4-Pyridyl)-Alanine	N-Fmoc-3-(4-pyridyl)-L-alanine	169555-95-7	Fluorochem
4PhenylPro	4-Phenylpyrrolidine-2-carboxylic acid	Fmoc-4-phenylpyrrolidine-2-carboxylic acid	269078-71-9	Cambridge Bioscience
Ac	Acetyl
AC3C	1-Aminocyclopropane -1-carboxylic acid	1-(Fmocamino)cyclopropanecarbo xylic acid	126705-22-4	Iris Biotech
AC4C	1-Amino-1-cyclobutanecarboxy lic acid	1-(Fmoc-amino)-cyclobutylcarboxylic acid	885951-77-9	Fluorochem
AC5C	1-Amino-1-cyclopentanecarbox ylic acid	1-(Fmoc-amino)cyclopentanecarbo xylic acid	117322-30-2	Iris Biotech
AF488	AlexaFluor488	AlexaFluor488-NHS Ester	Fisher Scientific
Aib	2-Aminoisobutyric acid	Fmoc-α-aminoisobutyric acid	94744-50-0	Fluorochem
Aza-Gly	Azaglycine
Aze	Azetidine	Fmoc-L-azetidine-2-carboxylic acid	136552-06-2	Combi Blocks
β-Ala	β-Alanine	Fmoc-β-alanine	35737-10-1	Fluorochem
Fmoc-alpha-sulfo-beta-Alanine	1005412 -03-2	Iris Biotech
C5g	Cyclopentylglycine	Fmoc-L-cyclopentylglycine	220497-61-0	Fluorochem
Cba	β-Cyclobutylalanine	Fmoc-β-cyclobutyl-L-alanine	478183-62-9	IRIS Biotech GmbH
Cpa	β-Cyclopropylalanine	Fmoc-β-cyclopropyl-L-alanine	214750-76-2	Fluorochem
Cpg	Cyclopropylglycine	Fmoc-L-cycloproprylglycine	1212257 -18-5	Apollo Scientific
Cya	Cysteic acid	Fmoc-L-cysteic acid	320384-09-6
D-3,3-DPA	3,3-diphenyl-D-alanine	Fmoc-3,3-diphenyl-D-alanine	189937-46-0	Chem-Impex internationa l
D-Arg	D-Arginine	Fmoc-D-Arginine(Pbf)	187618-60-6	Iris Biotech
D-Asp	D-Aspartic acid	Fmoc-D-aspartic acid 4-tert-butyl ester	112883-39-3	Sigma aldrich
D-Cya	D-cysteic acid	Fmoc-D-cysteic acid	Costom synthesis
D-K	D-Lysine	Fmoc-D-Lysine(Boc)	92122-45-7	Sigma Aldrich
DOTA	1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid
Fl	5(6)-carboxyfluorescein	Sigma
HArg	HomoArginine	Fmoc-L-HomoArg(Pbf)-OH	401915-53-5	Fluorochem
HPhe	HomoPhenylalanine	Fmoc-L-Homophenylalanine	132684-59-4	Iris Biotech
HyP	Hydroxyproline	Fmoc-Hydroxyproline(tBu)-OH	122996-47-8	Sigma
hSerMe	HomoSerine(methyl )	Fmoc-O-methyl-L-homoserine	173212-86-7	Iris Biotech
Lys(Dde)	Lysine(Dde)	N-α-Fmoc-N-ε-1-(4,4-dimethyl-2,6-dioxocyclohex-1-ylidene)ethyl-L-lysine	150629-67-7	Sigma Aldrich
NO2Phe	4-Nitrophenylalanine	Fmoc-4-nitro-L-phenylalanine	95753-55-2	PolyPeptide
Phg	Phenylglycine	Fmoc-L-phenylglycine	102410-65-1	Combi Blocks
Pip	Pipecolic acid	Fmoc-L-Pipecolic acid	86069-86-5	Peptech
Sar	Fmoc-Sarcosine-OH	77128-70-2	Sigma
tBuGly	Tert-leucine	Fmoc-L-tert-leucine	132684-60-7	Fluorochem
Thi	2-Thienylalanine	Fmoc-2-Thienylalanine	130309-35-2	Novabioche m
ThiAz	3-(1,2,4-triazol-1-yl)-Alanine	Fmoc-3-(1,2,4-triazol-1-yl)-Ala-OH	1217449 -37-0	Sigma
ΨAla	Reduced amide on backbone

Materials and Methods Peptide Synthesis

Peptides were synthesized by solid phase synthesis. Rink Amide MBHA Resin was used. To a mixture containing Rink Amide MBHA (0.4-0.45 mmol/g) and Fmoc-Cys(Trt)-OH (3.0 eq) was added DMF, then DIC (3 eq) and HOAt (3 eq) were added and mixed for 1 hour. 20% piperidine in DMF was used for deblocking. Each subsequent amino acid was coupled with 3 eq using activator reagents, DIC (3.0 eq) and HOAT (3.0 eq) in DMF. The reaction was monitored by ninhydrin color reaction or tetrachlor color reaction. After synthesis completion, the peptide resin was washed with DMF x 3, MeOH x 3, and then dried under N₂ bubbling overnight. The peptide resin was then treated with 92.5% TFA/2.5% TIS/2.5% EDT/2.5% H₂O for 3h. The peptide was precipitated with cold isopropyl ether and centrifuged (3 min at 3000 rpm). The pellet was washed twice with isopropyl ether and the crude peptide was dried under vacuum for 2 hours and then lyophilised. The lyophilised powder was dissolved in of ACN/H₂O (50:50), and a solution of 100 mM TATA in ACN was added, followed by ammonium bicarbonate in H₂O (1M) and the solution mixed for 1 h. Once the cyclisation was complete, the reaction was quenched with 1M aq. Cysteine hydrochloride (10 eq relative to TATA), then mixed and left to stand for an hour. The solution was lyophilised to afford crude product. The crude peptide was purified by Preparative HPLC and lyophilized to give the product

All amino acids, unless noted otherwise, were used in the L- configurations.

BCY6099 (Compound 66)

Sequence: (β-Ala)-Sar₁₀-(SEQ ID NO: 2)-CONH₂

8.0 g of resin was used to generate 2.1 g BCY6099 (99.2% purity; 16.3% yield) as a white solid.

BCY6099 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	15-45% B over 20 minutes, then 3 min 95% B
Retention Time:	11.31 min
LCMS (ESI):
Peptide mw	3183.68

BCY6014 (Reference Compound 67)

Sequence: (β-Ala)-Sar₁₀-(SEQ ID NO: 11)-CONH₂

4.79 g of resin was used to generate 1.07g BCY6014 (Q1: 131.9 mg, 97.99% purity; Q2: 141.7 mg, 99.04% purity; Q3: 800.7 mg, 92.35% purity; 16.9% yield) as white a solid.

BCY6014 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	9.95 min
LCMS (ESI):
Peptide mw	3039.53

BCY6104 (Reference Compound 99)

Sequence: (β-Ala)-Sar₁₀-A(HArg)DC(HyP)(Hse(Me))VNPLCLHP(D-Asp)W(HArg)C ((β-Ala)-Sar₁₀-(SEQ ID NO: 85))

4.44 g of resin was used to generate 700 mg BCY6104 (95.87% purity, 10.5% yield) as white a solid.

BCY6104 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	7.06 min
LCMS (ESI):
Peptide mw	3185.65

BCY6103 (Reference Compound 100)

Sequence: (β-Ala)-Sar₁₀-A(HArg)DC(HyP)(Hse(Me))VNPLCLHP(D-Asp)WTC ((β-Ala)-Sar₁₀-(SEQ ID NO: 86))

4.44 g of resin was used to generate 700 mg BCY6103 (98.9% purity, 11.1% yield) as white a solid.

BCY6103 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	8.02 min
LCMS (ESI):
Peptide mw	3117.55

BCY6101 (Reference Compound 101) Sequence: (β-Ala)-Sar₁₀-A(HArg)DC(HyP)LVNPLCLHP(D-Ala)WTC ((β-Ala)-Sar₁₀-(SEQ ID NO: 87))

4.44 g of resin was used to generate 700 mg BCY6101 (95.9% purity, 10.9% yield) as white a solid.

BCY6101 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	9.79 min
LCMS (ESI):
Peptide mw	3069.55

BCY6102 (Reference Compound 102)

Sequence: (β-Ala)-Sar₁₀-A(HArg)DCPLVNPLCLHP(D-Ala)WTC ((β-Ala)-Sar₁₀-(SEQ ID NO: 88))

4.44 g of resin was used to generate 900 mg BCY6102 (95.9% purity, 14.1% yield) as white a solid.

BCY6102 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	9.89 min
LCMS (ESI):
Peptide mw	3053.56

BCY6139 (Reference Compound 103) Sequence: (β-Ala)-Sar₁₀-ARDC(HyP)LVNPLCLHPGWTC ((β-Ala)-Sar₁₀-(SEQ ID NO: 89))

4.44 g of resin was used to generate 900 mg BCY6139 (97.4% purity, 11.2% yield) as white a solid.

BCY6139 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	8.95 min
LCMS (ESI):
Peptide mw	3042.51

BCY6138 (Reference Compound 104) Sequence: (β-Ala)-Sar₁₀-ARDCPLVNPLCL(D-3,3-DPA)PGWTC ((β-Ala)-Sar₁₀-(SEQ ID NO: 90))

1.11 g of resin was used to generate 200 mg BCY6138 (95.2% purity, 12.2% yield) as white a solid.

BCY6138 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 20 minutes, then 3 min 95% B
Retention Time:	14.46 min
LCMS (ESI):
Peptide mw	3111.63

BCY6137 (Reference Compound 105) Sequence: (β-Ala)-Sar₁₀-ARDCPLVNPLCLHPGWTCLH ((β-Ala)-Sar₁₀-(SEQ ID NO: 91))

4.44 g of resin was used to generate 600 mg BCY6137 (98.9% purity, 9.06% yield) as white a solid.

BCY6137 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	14.46 min
LCMS (ESI):
Peptide mw	3275.8

BCY6042 (Reference Compound 91)

Sequence: Ac-(SEQ ID NO: 14)-Sar₆-(D-K)

1.11 g of resin was used to generate 99.2 mg BCY6042 (99.2% purity, 7.0% yield) as white a solid.

BCY6042 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	9.12 min
LCMS (ESI):
Peptide mw	2825.31

BCY6019 (Reference Compound 77)

4.79 g of resin was used to generate 732.0 mg BCY6019 (92.82% purity, 12.2% yield) as white a solid

BCY6019 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	11.36 min
LCMS (ESI):
Peptide mw	2805.32

BCY6059 (Reference Compound 106)

To a solution of BCY6019 (0.05 g, 17.82 µmol, 1.00 eq) in H₂O (3 mL) was adjusted PH=11 by Na₂CO₃ (aq) and added acetyl acetate (5.46 mg, 53.46 µmol, 5.01 µL, 3.00 eq). The mixture was stirred at 15 °C for 1 hr. LC-MS showed BCY6019 was consumed completely and one main peak with desired MS was detected. The reaction was adjusted PH=7 by 1 N HCl and directly purified by prep-HPLC (TFA condition). Compound BCY6059 (18.1 mg, 6.36 µmol, 35.67% yield) was obtained as a white solid.

BCY6059 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	6.67 min
LCMS (ESI):
Peptide mw	2848.36

BCY6160 (Reference Compound 107)

Sequence: (β-AlaSO₃H)-Sar₄-(Cya)-Sar₄-(Cya)-A(HArg)DCPLVNPLCLHP(D-Cya)WTC ((β-AlaSO₃H)-Sar₄-(Cya)-Sar₄-(Cya)-(SEQ ID NO: 92))

1.11 g of resin was used to generate 45.2 mg BCY6160 (95.5% purity, 2.5% yield) as white a solid.

BCY6160 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	11.38 min
LCMS (ESI):
Peptide mw	3376.83

BCY6009 (Reference Compound 108)

Sequence: (β-Ala)-Sar₁₀-ARDCPLVNPLCLHPGWTC ((β-Ala)-Sar₁₀-(SEQ ID NO: 10))

4.79 g of resin was used to generate 2.42 g BCY6009 (>88.92% purity, 36.0% yield) as white a solid.

BCY6009 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	10.16 min
LCMS (ESI):
Peptide mw	3025.5

BCY6017 (Reference Compound 109)

Sequence: A(HArg)DCPLVNPLCLHPGWTC (SEQ ID NO: 11)

1.19 g of resin was used to generate 189.9 mg BCY6017 (95.05% purity, 16.8% yield) as white a solid.

BCY6017 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	10.01 min
LCMS (ESI):
Peptide mw	2257.67

BCY6018 (Reference Compound 110)

Sequence: (β-Ala)-Sar₅-(SEQ ID NO: 11)

1.19 g of resin was used to generate 289.1 mg BCY6018 (97.92% purity, 21.0% yield) as white a solid.

BCY6018 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	9.77 min
LCMS (ESI):
Peptide mw	2684.14

BCY6152 (Reference Compound 111)

Sequence: (β-AlaSO₃H)-Sar₁₀-(SEQ ID NO: 11)

1.11 g of resin was used to generate 150.0 mg BCY6152 (98.75% purity; 9.5% yield) as white a solid.

BCY6152 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	10.09 min
LCMS (ESI):
Peptide mw	3119.59

BCY6141 (Reference Compound 112)

Sequence: (β-Ala)-Sar₁₀-A(D-Arg)DC(HyP)LVNPLCL(D-3,3-DPA)P(D-Asp)W(HArg)C ((β-Ala)-Sar₁₀-(SEQ ID NO: 93))

1.11 g of resin was used to generate 120.0 mg BCY6141 (97.91% purity; 7.3% yield) as white a solid.

BCY6141 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	11.41 min
LCMS (ESI):
Peptide mw	3255.78

BCY6026 (Reference Compound 87)

Sequence: ACPLVNPLCLHPGWSCRGQ (SEQ ID NO: 77)

1.11 g of resin was used to generate 285.0 mg BCY6026 (97.7% purity; 24.2% yield) as white a solid.

BCY6026 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	9.31 min
LCMS (ESI):
Peptide mw	2299.71

BCY6153 (Reference Compound 113)

Sequence: (β-AlaSO₃H)-Sar₅-(SEQ ID NO: 11)

1.11 g of resin was used to generate 140.0 mg BCY6153 (98.59% purity; 9.9% yield) as white a solid.

BCY6153 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	20-50% B over 20 minutes, then 3 min 95% B
Retention Time:	10.33 min
LCMS (ESI):
Peptide mw	2764.2

Preparation of Bicyclic Peptide Drug Conjugates

The general schematic for preparing Bicycle drug conjugates (BDCs) is shown in Figure 3 and Table A describes the component targeting bicycle and linker/toxin within each BDC. Table A

6136	6099	ValCit-MMAE
*6033	6014
*6029	6009
*6122	6104
*6053	6018
*6049	6017
*6037	6019
*6030	6009	TrpCit-MMAE
*6034	6014
*6050	6017
*6054	6018
*6038	6019
*6061	6014	ValLys-MMAE
*6174	6099
*6062	6014	D-TrpCit-MMAE
*6135	6099	DM1-SS-
*6031	6014
*6134	6104
*6027	6009
*6047	6017
*6035	6019
*6051	6018
*6154	6152
*6155	6153
*6173	6099	DM1-SS(SO3H)-
*6082	6014
*6150	6018
*6151	6104
*6162	6138
*6161	6137
*6032	6014	DM1-SS-(Me)-
*6052	6018
*6048	6017
*6036	6019
*6028	6009
*6039	6014	DM1-(Me)-SS-(Me)-
*6055	6014	DM1-SS-(Me2)-
*6077	6014	DM1-SS-(Me)-SO3H-
*6063	6014	Non-cleavable (MMAE)
*6064	6014	Non-cleavable (DM1)
*6105	6014	MMAE-Ala-Ala-Asn
*6106	6014	MMAE-D-Ala-Phe-Lys-
*6175	6099
*6107	6014	MMAE-Glu-Pro-Cit-Gly-hPhe-Tyr-Leu-

Table A

The synthesis of Bicyclic Peptide Drug Conjugates BCY6027, BCY6028, BCY6031 and BCY6032 listed in Table 6 were performed using the protocol disclosed in WO 2016/067035 .

Activated bicycle peptides with formula (C) and (D): were synthesised by reacting the free amino group of the bicycle precursors with, respectively, SPP (N-succinimidyl 4-(2-pyridyldithio)pentanoate, Annova Chem) and SPDB (N-succinimidyl 3-(2-pyridyldithio)propionate, Annova Chem) in DMSO. Concentrations of bicycle precursors were 10 mM or higher, with a 1.3-fold excess of SPP or SPDB, and a 20-fold excess of diisopropylethylamine, at room temperature. The reaction was judged complete after 1 hour, as judged by LCMS. Purification was performed by reverse phase as described above. Appropriate fractions were lyophilised.

Activated bicycle peptides with formula (C) and (D) were disulphide exchanged with 1.15 equivalents of DM1 (as the free thiol), in semi aqueous conditions (50 % dimethylacetamide and 50% 100mM sodium acetate pH 5.0 supplemented with 2mM EDTA) for 21 hours at room temperature under a nitrogen gas blanket. Concentrations of activated bicycle peptides with structure C and D in the reaction were at 10 mM or higher.

This was followed by standard reverse phase purification using a C18 column. Fractions at purity greater than 95% were isolated and lyophilised. The materials did not contain measurable quantities of free toxin.

MMAE Series Val-Cit-M MAE Series Val-Cit-MMAE Linker

The peptide was synthesized by solid phase synthesis. 50g CTC Resin (sub: 1.0 mmol/g) was used. To a mixture containing CTC Resin (50 mmol, 50 g, 1.0 mmol/g) and Fmoc-Cit-OH (19.8 g, 50 mmol, 1.0 eq) was added DCM (400 mL), then DIEA (6.00 eq) was added and mixed for 3 hours. And then MeOH (50 mL) was added and mixed for 30 min for capping. 20% piperidine in DMF was used for deblocking. Boc-Val-OH (32.5g, 150mmol, 3eq) was coupled with 3 eq using HBTU (2.85 eq) and DIPEA (6.0 eq) in DMF (400 mL). The reaction was monitored by ninhydrin colour reaction test. After synthesis completion, the peptide resin was washed with DMF X 3, MeOH X 3, and then dried under N₂ bubbling overnight. After that the peptide resin was treated with 20% HFIP/DCM for 30 min for 2 times. The solution was removed on a rotary evaporator to give the crude. The crude peptide was dissolved in ACN/H2O, then llyophilized twice to give the peptide product (17.3g crude).

LCMS (ESI):
Molecular weight	374.44

A solution of Compound 2 (4.00 g, 10.68 mmol, 1.00 eq) in DCM (40.00 mL) and MeOH (20.00 mL) was stirred at room temperature, then (4-aminophenyl)methanol (1.58 g, 12.82 mmol, 1.20 eq) and EEDQ (5.28 g, 21.37 mmol, 2.00 eq) were added and the mixture stirred in the dark for 9 hrs. TLC (dichloromethane/methanol= 5/1, Rf = 0.56) indicated one new spot had formed. The reaction mixture was concentrated under reduced pressure to remove solvent. The resulting residue was purified by flash silica gel chromatography (ISCO^®; 120 g SepaFlash^® Silica Flash Column, Eluent of 0~20% MeOH/DCM @ 80 mL/min). Compound 3 (3.00 g, 6.26 mmol, 58.57% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	479.58

To a solution of Compound 3 (3.00 g, 6.26 mmol, 1.00 eq) in anhydrous THF (35.00 mL) and anhydrous DCM (15.00 mL) was added (4-nitrophenyl) chloroformate (6.31 g, 31.30 mmol, 5.00 eq) and pyridine (2.48 g, 31.30 mmol, 2.53 mL, 5.00 eq), and the mixture was stirred at 25 °C for 5 hrs. TLC (dichloromethane/methanol= 10/1, Rf = 0.55) indicated a new spot had formed. The reaction mixture was filtered, and the filtrate was concentrated under reduced pressure to give a residue. The residue was purified by flash silica gel chromatography (ISCO^®; 120 g SepaFlash^® Silica Flash Column, Eluent of 0~10% DCM/MeOH@ 80 mL/min). Compound 4 (2.00 g, 3.10 mmol, 49.56% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	644.68

A mixture of Compound 4 (278.43 mg, 387.80 µmol, 1.00 eq) and DIEA (501.19 mg, 3.88 mmol, 677.29 µL, 10.00 eq) in DMF (5.00 mL) was stirred under nitrogen for 10 min. MMAE (250.00 mg, 387.80 µmol, 1.00 eq) and HOBt (52.40 mg, 387.80 µmol, 1.00 eq) were added and the mixture was stirred at 0 °C under nitrogen for 20 min and stirred at 30 °C for additional 18 hrs. LC-MS showed one main peak with desired mass was detected. The resulting mixture was purified by flash C18 gel chromatography (ISCO^®; 130 g SepaFlash^® C18 Flash Column, Eluent of 0~50% MeCN/H₂O @ 75 mL/min). Compound 5 (190.00 mg, 155.29 µmol, 40.04% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1223.57

To a solution of Compound 5 (170.00 mg, 138.94 µmol, 1.00 eq) in DCM (2.70 mL) was added 2,2,2-trifluoroacetic acid (413.32 mg, 3.62 mmol, 268.39 µL, 26.09 eq), and the mixture was stirred at 25 °C for 1 hr. LC-MS showed Compound 5 was consumed completely. The mixture was concentrated under reduced pressure to give a residue. The residue was dissolved in THF (10.00 mL) and was added K₂CO₃ (192.03 mg, 1.39 mmol, 10.00 eq), the mixture was stirred at room temperature for additional 3 hrs. LC-MS showed one main peak with desired mass was detected. The resulting reaction mixture was concentrated under reduced pressure to remove solvent to give a residue. The residue was purified by flash C18 gel chromatography (ISCO^®; 130 g SepaFlash^® C18 Flash Column, Eluent of 0~50% MeCN/H₂O @ 75 mL/min). Compound 6 (110.00 mg, 97.92 µmol, 70.48% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1123.45

To a solution of Compound 6 (110.00 mg, 97.92 µmol, 1.00 eq) in DMA (5 mL), DIEA (25.31 mg, 195.83 µmol, 34.20 µL, 2.00 eq) and tetrahydropyran-2,6-dione (22.34 mg, 195.83 µmol, 2.00 eq). The mixture was stirred at room temperature for 18 hrs. LC-MS showed Compound 6 was consumed completely and one main peak with desired mass was detected. The reaction mixture was purified by flash C18 gel chromatography (ISCO^®; 130 g SepaFlash^® C18 Flash Column, Eluent of 0~50% MeCN/H₂O @ 75 mL/min). Compound 7 (100.00 mg, 80.81 µmol, 82.53% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1236.74

To a solution of Compound 7 (100.00 mg, 80.81 µmol, 1.00 eq) in DMA (4.5 mL) and DCM (1.5 mL) was added 1-hydroxypyrrolidine-2,5-dione (27.90 mg, 242.42 µmol, 3.00 eq) under N₂, the mixture was stirred at 0 °C for 30 min. EDCI (46.47 mg, 242.43 µmol, 3.00 eq) was added in the mixture, and the mixture was stirred at 25 °C for additional 16 hrs. LC-MS showed Compound 7 was consumed completely and one main peak with desired mass was detected. The reaction mixture was purified by flash C18 gel chromatography (ISCO^®; 130 g SepaFlash^® C18 Flash Column, Eluent of 0~50% MeCN/H₂O @ 75 mL/min). Compound 8 (90.00 mg, 60.69 µmol, 75.11% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1334.62

General Procedure for Coupling MMAE-PABC-Cit-Val-Glutarate-NHS with Targeting Bicycles

To a solution of Bicycle (1.0 - 1.3 eq) in DMA was added DIEA (3 eq) and MMAE-PABC-Cit-Val-Glutarate-NHS (1 eq). The mixture was stirred at 25 °C for 18 hr. The reaction was monitored by LC-MS and once complete, was directly purified by preparative HPLC.

BCY6136

BCY6099 (71.5 mg, 22.48 µmol) was used as the bicycle reagent. Compound BCY6136 (40.9 mg, 9.05 µmol, 40.27% yield, 97.42% purity) was obtained as a white solid.

BCY6136 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B

Retention Time:	11.35 min
LCMS (ESI):
Peptide mw	4404.2

BCY6033 (Reference Compound)

BCY6014 (70.00 mg, 22.47 µmol, 1.00 eq) was used as the bicycle reagent. Compound BCY6033 (33.90 mg, 7.96 µmol, 34.57% yield) was obtained as a white solid.

BCY6033 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	35-65% B over 20 minutes, then 3 min 95% B
Retention Time:	7.47 min
LCMS (ESI):
Peptide mw	4259.04

BCY6029 (Reference Compound)

BCY6009 (70.0 mg, 22.47 µmol, 1 eq) was used as the bicycle reagent. Compound BCY6029 (32.9 mg, 7.75 µmol, 33.49% yield) was obtained as a white solid.

BCY6029 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	35-65% B over 20 minutes, then 3 min 95% B
Retention Time:	7.46 min
LCMS (ESI):
Peptide mw	4245.02

BCY6122 (Reference Compound)

BCY6104 (71.59 mg, 22.48 µmol, 1.00 eq) was used as the bicycle reagent. Compound BCY6122 (38.30 mg, 8.57 µmol, 38.14% yield, 98.58% purity) was obtained as a white solid.

BCY6122 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	10.72 min
LCMS (ESI):
Peptide mw	4406.18

BCY6053 (Reference Compound)

BCY6018 (72.40 mg, 26.97 µmol, 1.2 eq) was used as the bicycle reagent. Compound BCY6053 (38.3 mg, 9.81 µmol, 43.65% yield) was obtained as a white solid.

BCY6053 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	12.95 min
LCMS (ESI):
Peptide mw	3905.67

BCY6049 (Reference Compound)

BCY6017 (50.75 mg, 22.48 µmol, 1.2 eq) was used as the bicycle reagent. Compound BCY6049 (22.5 mg, 6.47 µmol, 34.54% yield) was obtained as a white solid.

BCY6049 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	14.28 min
LCMS (ESI):
Peptide mw	3479.2

BCY6037 (Reference Compound)

BCY6019 (65.00 mg, 22.47 µmol, 1.00 eq) was used as the bicycle reagent. Compound BCY6037 (26.80 mg, 6.66 µmol, 28.74% yield) was obtained as a white solid.

BCY6037 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	35-65% B over 20 minutes, then 3 min 95% B
Retention Time:	8.79 min
LCMS (ESI):
Peptide mw	4025.84

Trp-Cit-MMAE Series (Reference Compounds) Trp-Cit-MMAE Linker

General procedure for preparation of 3

To a solution of compound 2 (4.00 g, 8.67 mmol, 1.00 eq), DIC (1.61 g, 12.78 mmol, 1.97 mL, 9.00 eq) and HOBt (10.54 g, 78.00 mmol, 9.00 eq) in DMF (30.00 mL) was added (4-aminophenyl)methanol (9.61 g, 78.00 mmol, 9.00 eq). The mixture was stirred at 15 °C for 1 hour. LC-MS showed compound 2 was consumed completely and one main peak with desired MS was detected. The mixture was purified by prep-HPLC. Compound 3 (4.20 g, 7.41 mmol, 85.49% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	566.66

General procedure for preparation of 4

To a solution of compound 3 (4.20 g, 6.30 mmol, 1.00 eq), DIPEA (1.09 g, 8.40 mmol, 1.47 mL, 7.00 eq) in DMF (30.00 mL) was added bis(4-nitrophenyl) carbonate (11.50 g, 37.79 mmol, 6.00 eq) in one part. The mixture was stirred at 0-15 °C for 1.5 hour. LC-MS showed compound 3 was consumed completely and one main peak with desired MS was detected. Directly purified by prep-HPLC (TFA condition). Compound 4 (2.00 g, 2.40 mmol, 38.16% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	731.76

General procedure for preparation of 5

To a solution of compound 4 (300.00 mg, 360.63 µmol, 1.00 eq), DIEA (93.22 mg, 721.27 µmol, 125.97 µL, 3.00 eq) in DMF (10.00 mL) was added MMAE (233.03 mg, 324.57 µmol, 0.90 eq) and HOBt (48.73 mg, 360.63 µmol, 1.00 eq) at 0 °C. The mixture was stirred at 30 °C for 18 hour. LC-MS showed compound 4 was consumed completely and one main peak with desired MS was detected. Directly purified by prep-HPLC (neutral condition). Compound 5 (250.00 mg, 190.75 µmol, 52.89% yield) was obtained as a yellow solid.

LCMS (ESI):
Molecular weight	1310.65

General procedure for preparation of 6

To a solution of compound 5 (240.00 mg, 183.12 µmol, 1.00 eq) in DCM (10.00 mL) was added TFA (1.54 g, 13.51 mmol, 1.00 mL, 73.76 eq). The mixture was stirred at 15 °C for 2 hour. And the mixture was concentrated under reduced pressure to remove solvent to give a residue, the residue was dissolved in THF and added K₂CO₃ and stirred at 15 °C for 2 h. LC-MS showed compound 5 was consumed completely and one main peak with desired MS was detected. The reaction mixture was concentrated under reduced pressure to remove solvent to give a residue. The residue was purified by prep-HPLC (neutral condition). The crude product 6 (125.00 mg, 94.37 µmol, 51.53% yield, TFA) was used into the next step without further purification.

LCMS (ESI):
Molecular weight	1209.53

General procedure for preparation of 7

To a solution of compound 6 (125.00 mg, 94.37 µmol, 1.00 eq, TFA) in DMA (5.00 mL) was added DIEA (24.39 mg, 188.75 µmol, 32.96 µL, 2.00 eq), tetrahydropyran-2,6-dione (21.54 mg, 188.75 µmol, 2.00 eq). The mixture was stirred at 15 °C for 2 hour. LC-MS showed compound 6 was consumed completely and one main peak with desired MS was detected. Directly purified by prep-HPLC (neutral condition). Compound 7 (100.00 mg, 75.49 µmol, 80.00% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1324.63

General procedure for preparation of 8 (MMAE-PABC-Cit-Trp-Glutarate-NHS)

To a solution of compound 7 (100.00 mg, 75.49 µmol, 1.00 eq), 1-hydroxypyrrolidine-2, 5-dione (26.07 mg, 226.48 µmol, 3.00 eq) in DMA (3.00 mL) and DCM (1.00 mL) was added EDCI (43.42 mg, 226.48 µmol, 3.00 eq). The mixture was stirred at 15 °C for 4 hour. LC-MS showed compound 7 was consumed completely and one main peak with desired MS was detected. The DCM was removed. Directly was purified by prep-HPLC (neutral condition). Compound 8 (60.00 mg, 42.20 µmol, 55.91% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1421.7

General Procedure for Coupling MMAE-PABC-Cit-Trp-Glutarate-NHS with Targeting Bicycles

To a solution of Bicycle (1.0-1.3 eq) in DMA was added DIEA (3 eq) and MMAE-PABC-Cit-Trp-Glutarate-NHS (1 eq). The mixture was stirred at 25 °C for 18 hr. The reaction was monitored by LC-MS and once complete, was directly purified by preparative HPLC.

BCY6030 (Reference Compound)

BCY6009 (47.29 mg, 14.07 µmol, 1.00 eq) was used as the bicycle reagent. Compound BCY6030 (0.0156 g, 3.51 µmol, 24.93% yield, 97.41% purity) was obtained as a white solid.

BCY6030 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	35-65% B over 20 minutes, then 3 min 95% B
Retention Time:	7.90 min
LCMS (ESI):
Peptide mw	4332.17

BCY6034 (Reference Compound)

BCY6014 (88.21 mg, 23.21 µmol, 1.10 eq) was used as the bicycle reagent. Compound BCY6034 (27.70 mg, 6.05 µmol, 28.70% yield, 95.02% purity) was obtained as a white solid.

BCY6034 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	30-60% B over 20 minutes, then 3 min 95% B
Retention Time:	11.49 min
LCMS (ESI):
Peptide mw	4346.13

BCY6050 (Reference Compound)

BCY6017 (57.17 mg, 25.32 µmol, 1.2 eq) was used as the bicycle reagent. Compound BCY6050 (0.0519 g, 14.56 µmol, 69.01% yield) was obtained as a white solid.

BCY6050 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	13.55 min
LCMS (ESI):
Peptide mw	3564.25

BCY6054 (Reference Compound)

BCY6018 (67.97 mg, 25.32 µmol, 1.2 eq) was used as the bicycle reagent. Compound BCY6054 (40.10 mg, 10.05 µmol, 47.62% yield) was obtained as a white solid.

BCY6054 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	13.73 min
LCMS (ESI):
Peptide mw	3990.72

BCY6038 (Reference Compound)

BCY6019 (81.39 mg, 23.21 µmol, 1.10 eq) was used as the bicycle reagent. Compound BCY6038 (34.10 mg, 8.02 µmol, 38.00% yield, 96.68% purity) was obtained as a white solid.

BCY6038 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	35-65% B over 20 minutes, then 3 min 95% B
Retention Time:	9.56 min
LCMS (ESI):
Peptide mw	4111.9

Val-Lys-MMAE Series (Reference Compounds) Val-Lys-MMAE Linker

General procedure for preparation of Compound 2

To a mixture of Compound 1 (3.00 g, 5.89 mmol, 1 eq) and (4-aminophenyl)methanol (869.93 mg, 7.06 mmol, 1.2 eq) in DCM (35 mL) and MeOH (18 mL) was added EEDQ (2.91 g, 11.77 mmol, 2 eq) in the dark under nitrogen, the mixture was stirred at 25 °C for 5 hr. LC-MS showed Compound 1 was consumed completely and one main peak with desired MS was detected. The resulting reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by flash silica gel chromatography (ISCO^®; 120 g SepaFlash^® Silica Flash Column, Eluent of 0~20% MeOH/DCM @ 80mL/min). Compound 2 (2.2 g, 3.58 mmol, 60.79% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	614.78

General procedure for preparation of Compound 3

To a solution Compound 2 (500 mg, 813.31 µmol, 1 eq) in THF (10 mL) was added DIEA (630.69 mg, 4.88 mmol, 849.98 µL, 6 eq) at 0 °C under nitrogen with strring for 30 mins. Then bis(4-nitrophenyl) carbonate (1.48 g, 4.88 mmol, 6 eq) was added thereto, the mixture was stirred at 25 °C under nitrogen for additional 21 hr. LC-MS showed one main peak with desired MS was detected. The resulting reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by flash silica gel chromatography (ISCO^®; 40 g SepaFlash^® Silica Flash Column, Eluent of 0~20% MeOH/DCM @ 40 mL/min). Compound 3 (500 mg, 641.13 µmol, 78.83% yield) was obtained as a yellow solid.

LCMS (ESI):
Molecular weight	779.89

General procedure for preparation of Compound 4

To a mixture of Compound 3 (500 mg, 512.90 µmol, 1.23 eq) in DMF (8 mL) was added DIEA (135.01 mg, 1.04 mmol, 181.95 µL, 2.5 eq) with stirring at 0 °C for 30 mins. Then MMAE (300 mg, 417.84 µmol, 1 eq) and HOBt (84.69 mg, 626.76 µmol, 1.5 eq) was added thereto, and the mixture was stirred at 40 °C for 15 hr. LC-MS showed compound 3 was consumed completely and one main peak with desired MS was detected. The residue was purified by flash C18 gel chromatography (ISCO^®; 130 g SepaFlash^® C18 Flash Column, Eluent of 0~60% MeCN/H2O @ 75 mL/min). Compound 4 (330 mg, 242.87 µmol, 58.13% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1358.77

General procedure for preparation of Compound 5

To a solution of Compound 4 (325 mg, 239.19 µmol, 1 eq) in DCM (18 mL) was added TFA (3.03 g, 26.60 mmol, 1.97 mL, 111.22 eq) at 0 °C, the mixture was stirred at 25°C for 2 hr. LC-MS showed compound 4 was consumed completely. Then the reaction mixture was concentrated under reduced pressure to give a residue, the residue was dissolved in THF (10 mL) and K₂CO₃ (661.16 mg, 4.78 mmol, 20 eq) was added thereto. The mixture was stirred at 25 °C for 15 hrs. LC-MS showed one main peak with desired MS was detected. The resulting reaction mixture was filtered and the filtrate was concentrated under reduced pressure to give a resiude. The residue was purified by flash C18 gel chromatography (ISCO^®; 130 g SepaFlash^® C18 Flash Column, Eluent of 0~60% MeCN/H2O @ 75 mL/min). Compound 5 (170 mg, 135.07 µmol, 56.47% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1258.65

General procedure for preparation of Compound 6

A round bottle containing a solution of compound 5 (140 mg, 111.23 µmol, 1 eq) in DMA (5 mL) was purged using a nitrogen balloon and added DIEA (28.75 mg, 222.46 µmol, 38.75 µL, 2 eq) at 0 °C with stirring for 10 mins, tetrahydropyran-2,6-dione (25.38 mg, 222.46 µmol, 2 eq) was addded as a solution in DMA. The mixture was stirred at 25 °C for 12 hr. LC-MS showed compound 5 was consumed completely and one main peak with desired MS was detected. The resulting reaction mixture was purified by flash C18 gel chromatography (ISCO^®; 43 g SepaFlash^® C18 Flash Column, Eluent of 0~60% MeCN/H2O @ 40 mL/min). Compound 6 (120 mg, 87.42 µmol, 78.59% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1372.75

General procedure for preparation of Compound 7 (MMAE-PABC-Lys(Dde)-Val-Glutarate-NHS)

To a solution of compound 6 (120 mg, 87.42 µmol, 1 eq) in DMA (9 mL) and DCM (3 mL) was added 1-hydroxypyrrolidine-2,5-dione (30.18 mg, 262.25 µmol, 3 eq) with stirring, and EDCI (50.27 mg, 262.25 µmol, 3 eq) was added thereto, the mixture was stirred at 0 °C for 30 mins and at 25 °C for additional 19 hr. LC-MS showed compound 6 was consumed completely and one main peak with desired MS was detected. The resulting reaction mixture was concentrated under reduced pressure to remove DCM. The mixture was purified by flash C18 gel chromatography (ISCO^®; 43 g SepaFlash^® C18 Flash Column, Eluent of 0~60% MeCN/H2O @ 40 mL/min). Compound 7 (60 mg, 40.82 µmol, 46.70% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1469.83

General Procedure for Coupling MMAE-PABC-Lys(Dde)-Val-Glutarate-NHS with Targeting Bicycles

To a solution of Bicycle (1.0-1.3 eq) in DMA was added DIEA (3 eq) and MMAE-PABC-Lys(Dde)-Val-Glutarate-NHS (1 eq). The mixture was stirred at 25 °C for 18 hr. The reaction was monitored by LC-MS and once complete, was directly purified by preparative HPLC.

General Procedure for Dde Deprotection

To a solution of Dde protected peptide (1 eq) in DMF was added hydrazine hydrate (6500 eq), and the mixture was stirred at 25 °C for 1 hr. LC-MS was used to monitor the reaction, and once complete, the mixture was purified by preparative HPLC and the clean fractions lyophilised.

BCY6061 (Reference Compound)

BCY6014 (124.12 mg, 40.82 µmol, 1.2 eq) was used as the bicycle reagent. Dde-BCY6038 (80 mg, 18.20 µmol, 53.51% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	4395.24

Dde-BCY6061 (78 mg, 17.75 µmol) was deprotected using hydrazine according to the general procedure to give BCY6061 (47.1 mg, 11.13 µmol, 62.73% yield) as a white solid.

BCY6061 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	12.01 min
LCMS (ESI):
Peptide mw	4230.03

BCY6174 (Reference Compound)

BCY6099 (389.77 mg, 122.47 µmol, 1.2 eq) was used as the bicycle reagent. Dde-BCY6174 (0.250 g, 55.10 µmol, 53.99% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	4538.38

Dde-BCY6174 (0.250 g, 55.10 µmol, 1.0 eq) was deprotected using hydrazine according to the general procedure to give BCY6174 (0.1206 g, 27.45 µmol, 49.82% yield) as a white solid.

BCY6174 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	9.85 min
LCMS (ESI):
Peptide mw	4373.17

D-Trp-Cit-MMAE Series (Reference Compounds) D-Trp-Cit-MMAE Linker

General procedure for preparation of Compound 3

To a solution of compound 1 (2 g, 4.33 mmol, 1.00 eq), DIC (4.92 g, 39.00 mmol, 6.00 mL, 9.00 eq) , HOBt (5.27 g, 39.00 mmol, 9.00 eq) in DMF (30.00 mL) was added (4-aminophenyl)methanol (4.80 g, 39.00 mmol, 9.00 eq) .The mixture was stirred at 15 °C for 1 hour . LC-MS showed compound 1 was consumed completely and one main peak with desired MS was detected. Directly purified by prep-HPLC (neutral condition). Compound 2 (2 g, 3.53 mmol, 81.45% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	666.78

General procedure for preparation of Compound 4

To a solution of compound 2 (2 g, 3.00 mmol, 1 eq), DIEA (2.71 g, 21.00 mmol, 3.66 mL, 7 eq) in DMF (20 mL) was added bis(4-nitrophenyl) carbonate (5.48 g, 18.00 mmol, 6 eq) in one part at 0°C. The mixture was stirred at 0-15 °C for 2 hr. LC-MS showed compound 2 was consumed completely and one main peak with desired MS was detected. Directly purified by prep-HPLC (neutral condition). Compound 3 (0.9 g, 1.08 mmol, 36.07% yield) was obtained as a yellow solid.

LCMS (ESI):
Molecular weight	831.88

General procedure for preparation of Compound 5

To a solution of compound 3 (350 mg, 420.74 µmol, 1.00 eq), HOBt (56.85 mg, 420.74 µmol, 1 eq) and DIEA (163.13 mg, 1.26 mmol, 219.86 µL, 3 eq) in DMF (10 mL) was added MMAE (302.08 mg, 420.74 µmol, 1 eq) at 0°C.The mixture was stirred at 40 °C for 18 hour. LC-MS showed compound 4 was consumed completely and one main peak with desired MS was detected. Directly purified by prep-HPLC (neutral condition). Compound 4 (0.22 g, 155.95 µmol, 37.06% yield) was obtained as a yellow solid.

LCMS (ESI):
Molecular weight	1410.76

General procedure for preparation of Compound 6

To a solution of compound 4 (0.21 g, 148.86 µmol, 1 eq) in DCM (9 mL) was added TFA (1.54 g, 13.51 mmol, 1 mL, 90.73 eq). The mixture was stirred at 15 °C for 4 h, and concentrated under reduced pressure to give a residue, dissloved in THF, then addded K₂CO₃(s) and stirred at 15 °C for 16 h. LC-MS showed compound 4 was consumed completely and one main peak with desired MS was detected. The reaction mixture was filtered and concentrated under reduced pressure to give a residue. The residue was purified by prep-HPLC (neutral condition). Compound 5 (0.13 g, 102.02 µmol, 68.54% yield, 95% purity) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1210.53

General procedure for preparation of Compound 7

To a solution of compound 5 (0.12 g, 99.13 µmol, 1 eq) in DMA (5 mL) was added DIEA (38.44 mg, 297.40 µmol, 51.80 µL, 3 eq) and tetrahydropyran-2,6-dione (22.62 mg, 198.26 µmol, 2 eq). The mixture was stirred at 15 °C for 16 hr. LC-MS showed compound 5 was consumed completely and one main peak with desired MS was detected. Directly purified by prep-HPLC (neutral condition). Compound 6 (0.09 g, 67.94 µmol, 68.54% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1324.63

General procedure for preparation of Compound 8

To a solution of compound 6 (0.09 g, 67.95 µmol, 1 eq), HOSu (23.46 mg, 203.84 µmol, 3 eq) in DMA (6 mL) and DCM (2 mL) was added EDCI (39.08 mg, 203.84 µmol, 3 eq). The mixture was stirred at 15 °C for 16 h. LC-MS showed compound 6 was consumed completely and one main peak with desired MS was detected. DCM was removed and directly purified by prep-HPLC (neutral condition). Compound 7 (0.06 g, 40.09 µmol, 59.01% yield, 95% purity) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1421.7

BCY6062 (Reference Compound)

To a solution of BCY6014 (76.99 mg, 25.32 µmol, 1.2 eq) in DMA (5 mL) was added DIEA (8.18 mg, 63.31 µmol, 11.03 µL, 3 eq), compound 7 (0.03 g, 21.10 µmol, 1 eq). The mixture was stirred at 15 °C for 16 hr. The reaction was monitored by LC-MS and once complete, the mixture was purified by preparative HPLC. BCY6062 (0.0255 g, 5.70 µmol, 27.01% yield, 97.15% purity) was obtained as a white solid.

BCY6062 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	13.15 min
LCMS (ESI):
Peptide mw	4346.13

DM1 Series (Reference Compounds) DM1-SS- Series DM1-SPDP-TFP Linker

SPDB

To a solution of 2-(2-pyridyldisulfanyl)pyridine (12.37 g, 56.18 mmol, 1.50 eq) in EtOH (100.00 mL) was added 4-sulfanylbutanoic acid (4.50 g, 37.45 mmol, 1.00 eq). The mixture was stirred at 15 °C for 18 hours under N₂. LC-MS showed compound 1 was consumed completely and one main peak with desired mass was detected. The reaction mixture was concentrated under reduced pressure to remove solvent to give a residue. The residue was purified by preparative HPLC (C18 360 g, neutral condition). Compound SPDB (1.9 g, 8.29 mmol, 22.12% yield) was obtained as a yellow solid.

¹H NMR: ES6446-8-P1A 400 MHz CDCl₃

δ ppm 1.98 (q, J=7.09 Hz, 2 H), 2.45 (t, J=7.15 Hz, 2 H), 2.79 (t, J=7.03 Hz, 2 H), 7.03 (dd, J=7.15, 4.89 Hz, 1 H), 7.19 (s, 1 H), 7.56 - 7.65 (m, 2 H), 8.41 (d, J=4.52 Hz, 1 H).

LCMS (ESI):
Molecular weight	229.31

DM1-SPDB

A mixture of DM1 (250.00 mg, 338.62 µmol, 1.00 eq) and 4-(2-pyridyldisulfanyl)butanoic acid (100.95 mg, 440.21 µmol, 1.30 eq) was added under nitrogen in a 50 mL of flask with DMF (10.00 mL) purged with N₂ for 30 mins. The mixture was stirred at room temperature for 1 hr. LC-MS showed that the DM1 was consumed completely and one main peak with desired mass was detected. The residue was purified by flash C18 gel chromatography (ISCO^®; 120 g SepaFlash^® C18 Flash Column, Eluent of 0~60% MeCN/H₂O @ 85 mL/min). DM1-SPDB (120.00 mg, 140.11 µmol, 41.38% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	856.44

DM1-SPDB-TFP

To a solution of DM1-SPDB (120.00 mg, 140.11 µmol, 1.00 eq) and 2,3,5,6-tetrafluorophenol (69.81 mg, 420.34 µmol, 3.00 eq) in DCM (1.00 mL) and DMA (3.00 mL) was added EDCI (80.58 mg, 420.34 µmol, 3.00 eq). The mixture was stirred at 15 °C for 4 hours. LC-MS showed DM1-SPDB was consumed completely and one main peak with desired mass was detected. The DCM was removed and the residue The mixture was directly purified by preparative HPLC (neutral condition). Compound DM1-SPDB-TFP (60.00 mg, 59.73 µmol, 42.63% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1004.5

General Procedure for Coupling DM1-SPDB-TFP with Targeting Bicycles

To a solution of targeting Bicycle (1.1-1.3 eq) in DMA was added DIEA (3 eq) and DM1-SPDB-TFP (1 eq). The mixture was stirred at 25 °C for 18 hr. The reaction was monitored by LC-MS and once complete, the mixture was directly purified by preparative HPLC.

BCY6135 (Reference Compound)

BCY6099 (114.1 mg, 35.84 µmol) was used as the bicycle reagent. 22.4 mg Compound BCY6135 (5.30 µmol, 17.74% yield, 95.14% purity) was obtained as a white solid.

BCY6135 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	9.81
LCMS (ESI):
Peptide mw	4021.08

BCY6031 (Reference Compound)

BCY6014 (121.07 mg, 39.82 µmol) was used as the bicycle reagent. 59.90 mg compound BCY6031 (14.67 µmol, 36.85% yield, 95.02% purity) was obtained as a white solid.

BCY6031 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	35-65% B over 20 minutes, then 3 min 95% B
Retention Time:	6.284 min
LCMS (ESI):
Peptide mw	3877.96

BCY6134 (Reference Compound)

BCY6104 (95.11 mg, 29.87 µmol, 1 eq) was used as the bicycle reagent. BCY6134 (0.0232 g, 5.64 µmol, 18.89% yield, 97.82% purity) was obtained as a white solid.

BCY6134 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	9.10 min
LCMS (ESI):
Peptide mw	4026.1

BCY6027 (Reference Compound)

BCY6009 (60.24 mg, 19.91 µmol, 1.00 eq) was used as the bicycle reagent. BCY6027 (20.40 mg, 5.11 µmol, 25.69% yield, 96.88% purity) was obtained as a white solid.

BCY6027 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	35-65% B over 20 minutes, then 3 min 95% B
Retention Time:	5.97 min
LCMS (ESI):
Peptide mw	3863.99

BCY6047 (Reference Compound)

BCY6017 (61.81 mg, 27.38 µmol, 1.1 eq) was used as the bicycle reagent. BCY6047 (0.032 g, 10.34 µmol, 41.53% yield) was obtained as a white solid.

BCY6047 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	38-68% B over 30 minutes, then 3 min 95% B
Retention Time:	12.28 min
LCMS (ESI):
Peptide mw	3096.1

BCY6035 (Reference Compound)

BCY6019 (115.22 mg, 32.86 µmol, 1.10 eq) was used as the bicycle reagent. BCY6035 (37.80 mg, 10.37 µmol, 34.73% yield) was obtained as a white solid.

BCY6035 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	35-65% B over 20 minutes, then 3 min 95% B
Retention Time:	12.28 min
LCMS (ESI):
Peptide mw	3643.73

BCY6051 (Reference Compound)

BCY6018 (73.48 mg, 27.38 µmol, 1.1 eq) was used as the bicycle reagent. BCY6051 (0.0582 g, 16.52 µmol, 66.39% yield) was obtained as a white solid.

BCY6051 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28 - 68% B over 30 minutes, then 3 min 95% B
Retention Time:	11.37 min
LCMS (ESI):
Peptide mw	3522.57

BCY6154 (Reference Compound)

BCY6152 (93.17 mg, 29.87 µmol, 1 eq) was used as the bicycle reagent. BCY6154 (40.10 mg, 9.93 µmol, 33.27% yield, 98.06% purity) was obtained as a white solid.

BCY6154 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28 - 68% B over 30 minutes, then 3 min 95% B
Retention Time:	11.94 min
LCMS (ESI):
Peptide mw	3958.02

BCY6155 (Reference Compound)

BCY6153 (82.55 mg, 29.87 µmol, 1 eq) was used as the bicycle reagent. BCY6155 (0.0312 g, 8.55 µmol, 28.62% yield, 98.69% purity) was obtained as a white solid.

BCY6155 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28 - 68% B over 30 minutes, then 3 min 95% B
Retention Time:	12.93 min
LCMS (ESI):
Peptide mw	3602.63

DM1-SS(SO3H)- Series (Reference Compounds) DM1-SPDP(SO3H)-NHS Linker

To a solution of 4-sulfanylbutanoic acid (2.0 g, 16.64 mmol, 1 eq) and 2-(2-pyridyldisulfanyl) pyridine (11.0 g, 49.93 mmol, 3 eq) in EtOH (50 mL) was added AcOH (1.05 g, 17.48 mmol, 1 mL, 1.05 eq). The mixture was stirred at 40 °C for 16 hr under N₂. LC-MS showed one main peak with desired mass was detected and TLC indicated 4-sulfanylbutanoic acid was consumed completely. The reaction mixture was concentrated under reduced pressure to remove solvent to give a residue. The residue was purified by preparative HPLC (neutral condition). Compound 2 (2.0 g, 8.72 mmol, 52.4% yield) was obtained as yellow solid.

¹H NMR: 400 MHz CDCl₃

δ ppm 2.03-2.11 (m, 2 H), 2.54 (t, J=7.20 Hz, 2 H), 2.88 (t, J=7.20 Hz, 2 H), 7.11-7.14 (m, 1 H), 7.67-7.74 (m, 2 H), 8.50 (d, J=4.80 Hz, 1 H).

LCMS (ESI):
Molecular weight	229.31

To a solution of compound 2 (0.5 g, 2.18 mmol, 1 eq) in DCE (5 mL) was added chlorosulfonic acid (1.5 g, 13.08 mmol, 0.89 mL, 6 eq) in three portions and DIEA (1.13 g, 8.72 mmol, 1.52 mL, 4 eq) in two portions. The mixture was stirred at 75 °C for 2 hr. LC-MS showed compound 2 was consumed completely and one main peak with desired mass was detected. The reaction mixture was quenched by addition 3 mL of H₂O and the DCE was removed. The residue was The mixture was directly purified by preparative HPLC (neutral conditions). Compound 3 (0.68 g, 1.76 mmol, 80.6% yield, 80% purity) was obtained as light yellow oil.

¹H NMR: 400 MHz CDCl₃

δ ppm 2.49-2.54 (m, 2 H), 3.63-3.67 (m, 2 H), 3.90 (t, J=6.60 Hz, 2 H), 7.09-7.12 (m, 1 H), 7.66-7.76 (m, 2 H), 8.47 (dd, J=4.80 Hz, 0.80 Hz, 1 H), 8.56 (s, 1 H).

LCMS (ESI):
Molecular weight	309.37

DM1-SO₃H-SPDB

To a solution of DM1 (1.0 g, 1.35 mmol, 1 eq) and compound 3 (502.9 mg, 1.63 mmol, 1.2 eq) in DMF (10 mL) was added NaHCO₃(aq) until the pH reached 8. The mixture was stirred at 25 °C for 1 hr. LC-MS showed DM1 was consumed completely and one main peak with desired mass was detected. The residue was The mixture was directly purified by preparative HPLC (neutral condition). Compound DM1-SO₃H-SPDB (0.28 g, 299.0 µmol, 22.1% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	936.50

DM1-SO₃H-SPDB-NHS

To a solution of DM1-SO₃H-SPDB (103.2 mg, 896.95 µmol, 3 eq), 1-Hydroxypyrrolidine -2,5-dione (103.2 mg, 896.95 µmol, 3 eq) in DMA (6 mL) and DCM (2 mL) was added EDCI (171.9 mg, 896.95 µmol, 3 eq). The mixture was stirred at 25 °C for 16 hr. LC-MS showed DM1-SO3H-SPDB was consumed completely and one main peak with desired mass was detected. DCM was removed. The residue was The mixture was directly purified by preparative HPLC (neutral condition). Compound DM1-SO₃H-SPDB-NHS (0.22 g, 212.85 µmol, 71.2% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1033.57

General Procedure for Coupling DM1-SO3H-SPDB-NHS with Targeting Bicycles

To a solution of targeting Bicycle (1.1-1.3 eq) in DMA was added DIEA (3 eq) and DM1-SO3H-SPDB-NHS (1 eq). The mixture was stirred at 25 °C for 16 hr. The reaction was monitored by LC-MS and once complete, the mixture was directly purified by preparative HPLC.

BCY6173 (Reference Compound)

BCY6099 (200.15 mg, 62.89 µmol) was used as the bicycle reagent. 57.1 mg compound BCY6173 (3.40 µmol, 22.79% yield, 95.80% purity) was obtained as a white solid.

BCY6173 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	10.30 min
LCMS (ESI):
Peptide mw	4101.15

BCY6082 (Reference Compound)

BCY6014 (711.9 mg, 234.14 µmol) was used as the bicycle reagent. 308 mg compound BCY6082 (74.97 µmol, 35.2% yield, 96.36% purity) was obtained as a white solid.

BCY6082 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	11.95 min
LCMS (ESI):
Peptide mw	3911.04

BCY6150 (Reference Compound)

BCY6018 (77.91 mg, 29.03 µmol, 1 eq) was used as the bicycle reagent. BCY6150 (0.0249 g, 6.61 µmol, 22.78% yield) was obtained as a white solid.

BCY6150 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	12.31 min
LCMS (ESI):
Peptide mw	3602.63

BCY6151 (Reference Compound)

BCY6104 (120.17 mg, 37.73 µmol, 1.3 eq) was used as the bicycle reagent. BCY6151 (0.0256 g, 6.16 µmol, 21.22% yield) was obtained as a white solid.

BCY6151 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	8.68 min
LCMS (ESI):
Peptide mw	4105.16

BCY6162 (Reference Compound)

BCY6138 (82.80 mg, 26.61 µmol, 1.1 eq) was used as the bicycle reagent. BCY6162 (0.0362 g, 8.98 µmol, 37.13% yield) was obtained as a white solid.

BCY6162 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	21.09 min
LCMS (ESI):
Peptide mw	4026.74

BCY6161 (Reference Compound)

BCY6137 (79.67 mg, 24.48 µmol, 1.1 eq) was used as the bicycle reagent. BCY6161 (0.0232 g, 5.26 µmol, 21.76% yield) was obtained as a white solid.

BCY6161 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	10.22 min
LCMS (ESI):
Peptide mw	4192.33

DM1-SS-Me Series (Reference Compounds) DM1-SS-Me Linker

SPP

To a solution of 2-(2-pyridyldisulfanyl)pyridine (2.46 g, 11.18 mmol, 1.50 eq) and AcOH (1.05 g, 17.49 mmol, 1.00 mL, 2.35 eq) in EtOH (50.00 mL) was added 4-sulfanylpentanoic acid (1.00 g, 7.45 mmol, 1.00 eq). The mixture was stirred at 40 °C for 18 hours under N₂. LC-MS showed compound 1 was consumed completely and one main peak with desired mass was detected. The reaction mixture was concentrated under reduced pressure to remove solvent to give a residue. The residue was purified by preparative HPLC (neutral condition). Compound SPP (1.61 g, 6.62 mmol, 88.81% yield) was obtained as a yellow solid.

¹H NMR: 400 MHz DMSO-d₆

δ ppm 1.36 (d, J=6.78 Hz, 3 H), 1.88 - 2.07 (m, 2 H), 2.56 (td, J=7.53, 1.76 Hz, 2 H), 3.00 - 3.09 (m, 1 H), 7.11 (ddd, J=7.34, 4.96, 1.00 Hz, 1 H), 7.66 (td, J=7.78, 1.76 Hz, 1 H), 7.73 - 7.77 (m, 1 H), 8.48 (dt, J=4.02, 0.88 Hz, 1 H).

LCMS (ESI):
Molecular weight	243.34

DM1-SPP

A solution of DM1 (200 mg, 270.90 µmol, 1.00 eq), 4-(2-pyridyldisulfanyl)pentanoic acid (98.89 mg, 406.35 µmol, 1.50 eq) in H2O (5.00 mL) was adjusted PH = 8 using NaHCO₃ (aq). The mixture was stirred at 15 °C for 1 hour. LC-MS showed DM1 was consumed completely and one main peak with desired mass was detected (main MS was M+1-18). The mixture was directly purified by preparative HPLC (neutral condition). Compound DM1-SPP (120 mg, 137.86 µmol, 50.89% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	870.47

DM1-SPP-TFP

To a solution of DM1-SPP (0.175 g, 201.04 µmol, 1.0 eq), 2,3,5,6-tetrafluorophenol (100.16 mg, 603.13 µmol, 3.0 eq) in DCM (1.0 mL) and DMA (3.0 mL) was added EDCI (115.62 mg, 603.13 µmol, 3.0 eq). The mixture was stirred at 15 °C for 12 hour. LC-MS showed DM1-SPP was consumed completely and one main peak with desired MS was detected. The DCM was removed and the residue was purified by prep-HPLC (neutral condition). Compound DM1-SPP-TFP (0.123 g, 120.76 µmol, 60.07% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1018.53

General Procedure for Coupling DM1-SPP-TFP with Targeting Bicycles

To a solution of targeting Bicycle (1.1-1.3 eq) in DMA was added DIEA (3 eq) and DM1-SPP-TFP (1 eq). The mixture was stirred at 25 °C for 16 hr. The reaction was monitored by LC-MS and once complete, the mixture was directly purified by preparative HPLC.

BCY6032 (Reference Compound)

To a solution of DM1-SPP (30.00 mg, 34.46 µmol, 1.00 eq) in DMF (5.00 mL) was added DIEA (13.36 mg, 103.38 µmol, 18.05 µL, 3.00 eq) and HATU (13.10 mg, 34.46 µmol, 1.00 eq). After 1 h, BCY6014 (104.79 mg, 34.46 µmol, 1.00 eq) was added and the mixture was stirred at 15 °C for 2 hours. LC-MS showed 40% of DM1-SPP was remained. Several new peaks were observed on LC-MS and 20% of desired compound was detected. The mixture was directly purified by preparative HPLC (TFA condition). Compound BCY6032 (10.00 mg, 2.57 µmol, 7.45% yield) was obtained as a white solid.

BCY6032 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	25-55% B over 20 minutes, then 3 min 95% B
Retention Time:	13.38 min
LCMS (ESI):
Peptide mw	3892.94

BCY6052 (Reference Compound)

BCY6018 (86.96 mg, 32.40 µmol, 1.1 eq) was used as the bicycle reagent. BCY6052 (32.30 mg, 9.13 µmol, 31.01% yield) was obtained as a white solid.

BCY6052 Analytical Data
Mobile Phase:	A: 0.1% Formic acid in H2O B: ACN
Flow:	1.0ml/min
Column:	Eclipse XDB-Phenyl 3.5um 100*3.0mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	35-65% B over 20 minutes, then 3 min 95% B
Retention Time:	6.96 min
LCMS (ESI):
Peptide mw	3536.58

BCY6048 (Reference Compound)

BCY6017 (66.50 mg, 29.45 µmol, 1.2 eq) was used as the bicycle reagent. BCY6048 (40.80 mg, 13.12 µmol, 53.45% yield) was obtained as a white solid.

BCY6048 Analytical Data
Mobile Phase:	A: 0.1% Formic acid in H2O B: ACN
Flow:	1.0ml/min
Column:	Eclipse XDB-Phenyl 3.5um 100*3.0mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	35-65% B over 20 minutes, then 3 min 95% B
Retention Time:	7.56 min
LCMS (ESI):
Peptide mw	3110.13

BCY6036 (Reference Compound)

BCY6019 (113.60 mg, 32.40 µmol, 1.10 eq) was used as the bicycle reagent. BCY6036 (53.20 mg, 14.00 µmol, 47.54% yield, 96.26% purity) was obtained as a white solid.

BCY6036 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1% TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	35-65% B over 20 minutes, then 3 min 95% B
Retention Time:	8.19 min
LCMS (ESI):
Peptide mw	3657.76

BCY6028 (Reference Compound)

BCY6009 (99.00 mg, 29.45 µmol, 1.00 eq) was used as the bicycle reagent. BCY6028 (24.30 mg, 6.05 µmol, 20.56% yield, 96.61% purity) was obtained as a white solid.

BCY6028 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1% TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	35-65% B over 20 minutes, then 3 min 95% B
Retention Time:	6.43 min
LCMS (ESI):
Peptide mw	3877.96

Disulfide Linkers (Various Hindrances) (Reference Compounds) BCY6039 (DM1-Me-SS-Me-Bicycle) (Reference Compound)

To a solution of 2-(2-pyridyldisulfanyl)pyridine (2.46 g, 11.18 mmol, 1.50 eq) and AcOH (1.05 g, 17.49 mmol, 1.00 mL, 2.35 eq) in EtOH (50.00 mL) was added 4-sulfanylpentanoic acid (1A) (1.00 g, 7.45 mmol, 1.00 eq). The mixture was stirred at 40 °C for 18 hours under N₂. LC-MS showed 1A was consumed completely and one main peak with the desired mass was detected. The reaction mixture was concentrated under reduced pressure to give a residue, which was purified by preparative HPLC (neutral condition). Compound 2A (1.61 g, 6.62 mmol, 88.81% yield) was obtained as a light yellow solid.

LCMS (ESI):
Molecular weight	243.34

To a solution of 2A (0.01 g, 41.09 µmol, 1.00 eq), 1-hydroxypyrrolidine-2,5-dione (14.19 mg, 123.28 µmol, 3.00 eq) in DMA (1 mL) was added EDCI (23.63 mg, 123.28 µmol, 3.00 eq). The mixture was stirred at 15 °C for 16 hr. LC-MS showed 2A was consumed completely and one main peak with desired mass was detected. The residue was purified by preparative HPLC (neutral condition). Compound 3A (0.011 g, 32.31 µmol, 78.63% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	340.41

To a solution of BCY6014 (98.25 mg, 32.31 µmol, 1.00 eq) in DMA (3 mL) was added DIEA (8.26 mg, 64.62 µmol, 11.26 µL, 2.00 eq) and 3A (0.011 g, 32.31 µmol, 1.00 eq). The mixture was stirred at 15 °C for 18 hr. LC-MS showed 3A was consumed completely and one main peak with desired mass was detected. The mixture was directly purified by preparative HPLC (neutral condition). Compound 4A (0.04 g, 12.25 µmol, 37.90% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	3264.88

To a solution of 4A (0.04 g, 12.25 µmol, 1.00 eq) in MeCN (4 mL) and H₂O (2 mL) was added TCEP (4.21 mg, 14.70 µmol, 4.05 µL, 1.20 eq). The mixture was stirred at 15 °C for 1 hr. LC-MS showed 4A was consumed completely and one main peak with the desired mass was detected.

The residue was purified by preparative HPLC (neutral condition). Compound 5A (0.035 g, 11.09 µmol, 90.53% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	3155.73

DM3-SPy

To a solution of 4-(2-pyridyldisulfanyl)pentanoic acid (2A) (22.46 mg, 92.29 µmol, 1.20 eq), HATU (35.09 mg, 92.29 µmol, 1.20 eq), DIEA (29.82 mg, 230.71 µmol, 40.19 µL, 3.00 eq) in DMF (5 mL) was added 1B (0.05 g, 76.90 µmol, 1.00 eq). The mixture was stirred at 15 °C for 1 hr. LC-MS showed 1B was consumed completely and one main peak with the desired mass was detected. The residue was purified by preparative HPLC (neutral condition). Compound DM3-SPy (0.025 g, 28.56 µmol, 37.13% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	875.49

BCY6039

A solution of DM3-SPy (0.015 g, 17.13 µmol, 1.00 eq) and 5A (54.08 mg, 17.13 µmol, 1.00 eq) in DMF (3 mL) was adjusted to pH=8 using NaHCO₃(aq). The mixture was stirred at 15 °C for 1 hr. LC-MS showed DM3-SPy was consumed completely and one main peak with desired mass was detected. The mixture was directly purified by preparative HPLC (TFA condition). Compound BCY6039 (0.0263 g, 6.58 µmol, 38.39% yield) was obtained as a white solid.

BCY6039 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE (1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	13.01 min
LCMS (ESI):
Peptide mw	3921.01

BCY6055 (DM1-SS-Me₂-Bicycle) (Reference Compound)

To a solution of compound 1 (0.045 g, 126.96 µmol, 1 eq) in H₂O (1 mL) was adjusted pH = 13 using 1 N NaOH solution. The mixture was stirred at 15 °C for 16 hr. LC-MS showed compound 1 was consumed completely and one main peak with the desired mass was detected. The residue was purified by preparative HPLC (neutral condition). Compound 2 (0.03 g, 116.56 µmol, 91.81% yield) was obtained as a yellow solid.

LCMS (ESI):
Molecular weight	257.37

A solution of compound 2 (0.03, 116.56 µmol, 1.0 eq) and DM1 (111.87 mg, 151.53 µmol, 1.3 eq) in DMF (5 mL) was stirred at 15 °C for 2 hours. LC-MS showed DM1 was consumed completely and one main peak with desired mass was detected. The mixture was directly purified by preparative HPLC (NH₄HCO₃ condition). Compound 3 (0.05 g, 56.53 µmol, 48.50% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	884.49

To a solution of compound 3 (0.05 g, 56.53 µmol, 1.0 eq) and 2,3,5,6-tetrafluorophenol (28.16 mg, 169.59 µmol, 3.0 eq) in DMA (3 mL) and DCM (1 mL) was added EDCI (32.51 mg, 169.59 µmol, 3 eq). The mixture was stirred at 15 °C for 16 hr. LC-MS showed compound 3 was consumed completely and one main peak with desired mass was detected. DCM was removed and the mixture was directly purified by preparative HPLC (neutral condition). Compound 4 (0.03 g, 29.05 µmol, 51.40% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1032.55

BCY6055

To a solution of BCY6014 (106.01 mg, 34.87 µmol, 1.2 eq) in DMA (3 mL) was added DIEA (11.27 mg, 87.16 µmol, 15.18 µL, 3.0 eq) and compound 4 (0.03 g, 29.05 µmol, 1.0 eq). The mixture was stirred at 15 °C for 16 hr. LC-MS showed compound 4 was consumed completely and one main peak with desired mass was detected. The mixture was directly purified by preparative HPLC (TFA condition). Compound BCY6055 (0.0352 g, 9.01 µmol, 31.01% yield) was obtained as a white solid.

BCY6055 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE (1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	12.68 min
LCMS (ESI):
Peptide mw	3906.98

BCY6077 (DM1-SS-Me-(SO3H)-Bicycle) (Reference Compound)

General procedure for preparation of compound 2

To a solution of compound 1 (0.1 g, 410.94 µmol, 1 eq) in 1,2-dichloroethane (3 mL) was added sulfurochloridic acid (0.86 g, 7.38 mmol, 491.43 µL, 17.96 eq) on three parts and DIEA (318.67 mg, 2.47 mmol, 429.47 µL, 6 eq) was added on two parts. The mixture was stirred at 75 °C for 16 hr. LC-MS showed compound 1 was consumed completely and one main peak with desired MS was detected MS324, one main peak of byproduct MS 221 was PySSPy. The solvent was removed and dissolved in H2O/MeCN=15/1. Directly purified by prep-HPLC (neutral condition: MeCN/H₂O). Compound 2 (0.055 g, 170.06 µmol, 41.38% yield) was obtained as a yellow oil.

LCMS (ESI):
Molecular weight	323.4

General procedure for preparation of DM1-SO3H-SPP

To a solution of DM1 (113.00 mg, 153.06 µmol, 1.1 eq), compound 2(0.045 g, 139.14 µmol, 1 eq) in DMF (2 mL) was adjusted PH=8 used for NaHCO₃(aq) .The mixture was stirred at 15 °C for 1 hr. LC-MS showed DM1 was consumed completely and one main peak with desired MS was detected. Directly purified by prep-HPLC (neutral condition). Compound DM1-SO3H-SPP (0.075 g, 78.90 µmol, 56.71% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	950.52

General procedure for preparation of DM1-SO3H-SPP-NHS

To a solution of DM1-SO3H-SPP (0.06 g, 63.12 µmol, 1 eq), 1- hydroxypyrrolidine-2, 5-dione (7.99 mg, 69.43 µmol, 1.1 eq) in DMA (1.5 mL) and DCM (0.5 mL) was added EDCI (13.31 mg, 69.43 µmol, 1.1 eq). The mixture was stirred at 15 °C for 18 hr. LC-MS showed DM1-S03H-SPP was consumed completely and one main peak with desired MS was detected. Directly purified by prep-HPLC (neutral condition: MeCN/H₂O). Compound DM1-SO3H-SPP-NHS (0.045 g, 42.96 µmol, 68.05% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1047.6

General procedure for preparation of BCY6077

To a solution of BCY6014 (101.58 mg, 33.41 µmol, 1 eq) in DMA (1 mL) was added DIEA (12.95 mg, 100.23 µmol, 17.46 µL, 3 eq) and DM1-SO3H-SPP-TFP (0.035 g, 33.41 µmol, 1 eq). The mixture was stirred at 15 °C for 16 hr. LC-MS showed DM1-SO3H-SPP-TFP was consumed completely and one main peak with desired MS was detected. Directly purified by prep-HPLC (TFA condition). Compound BCY6077 (41.30 mg, 10.03 µmol, 30.01% yield, 96.44% purity) was obtained as a white solid.

BCY6077 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE (1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	11.80 min
LCMS (ESI):
Peptide mw	3972.06

Non-Cleavable Series (Reference Compounds) BCY6063 (MMAE) (Reference Compound)

Glutarate-MMAE

To a solution of MMAE (0.2 g, 278.56 µmol, 1.0 eq) in DMA (3 mL) was added DIEA (108.01 mg, 835.68 µmol, 145.56 µL, 3.0 eq) and tetrahydropyran-2,6-dione (63.57 mg, 557.12 µmol, 2.0 eq). The mixture was stirred at 15 °C for 16 hr. LC-MS showed MMAE was consumed completely and one main peak with desired mass was detected. The mixture was The mixture was directly purified by preparative HPLC (neutral condition). Compound Glutarate-MMAE (0.12 g, 144.22 µmol, 51.77% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	832.09

Glutarate-MMAE-NHS

To a solution of Glutarate-MMAE (0.12 g, 144.22 µmol, 1.0 eq), 1- hydroxypyrrolidine-2, 5-dione (49.79 mg, 432.65 µmol, 3.0 eq) in DMA (3 mL) and DCM (1 mL) was added EDCI (82.94 mg, 432.65 µmol, 3.0 eq). The mixture was stirred at 15 °C for 16 hr. LC-MS showed Glutarate-MMAE was consumed completely and one main peak with desired mass was detected. The mixture was The mixture was directly purified by preparative HPLC (TFA condition). Compound Glutarate-MMAE-NHS (0.055 g, 59.19 µmol, 41.04% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	929.17

BCY6063

To a solution of BCY6014 (98.17 mg, 32.29 µmol, 1.2 eq) in DMA (2 mL) were added DIEA (10.43 mg, 80.72 µmol, 14.06 µL, 3 eq) and Glutarate-MMAE-NHS (0.025 g, 26.91 µmol, 1 eq). The mixture was stirred at 15 °C for 16 hr. LC-MS showed Glutarate-MMAE-NHS was consumed completely and one main peak with desired mass was detected. The mixture was directly purified by preparative HPLC (TFA condition). Compound BCY6063 (32.10 mg, 8.33 µmol, 30.95% yield) was obtained as a white solid.

BCY6063 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	10.86 min
LCMS (ESI):
Peptide mw	3854.56

BCY6064 (DM1) (Reference Compound)

To a solution of DM1 (0.1 g, 135.45 µmol, 1 eq), 3-[(2-bromoacetyl)amino]propanoic acid (34.14 mg, 162.54 µmol, 1.2 eq) in DMF (5 mL) was added TEA (41.12 mg, 406.35 µmol, 56.56 µL, 3 eq). The mixture was stirred at 15 °C for 1 hr. LC-MS showed DM1 was consumed completely and one main peak with the desired mass was detected. The mixture was directly purified by preparative HPLC (neutral conditions). Compound 1 (0.08 g, 92.23 µmol, 68.09% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	867.41

To a solution of compound 1 (0.08 g, 92.23 µmol, 1 eq), 2,3,5,6-tetrafluorophenol (45.95 mg, 276.69 µmol, 3 eq) in DMA (3 mL) and DCM (1 mL) was added EDCI (53.04 mg, 276.69 µmol, 3 eq). The mixture was stirred at 15 °C for 4 hr. LC-MS showed compound 1 was consumed completely and one main peak with desired mass was detected. The mixture was directly purified by preparative HPLC (neutral condition). Compound 2 (0.06 g, 59.09 µmol, 64.06% yield) was obtained as a white solid.

LCMS (ESI):
Molecular weight	1015.46

BCY6064

To a solution of BCY6014 (107.79 mg, 35.45 µmol, 1.2 eq) in DMA (3 mL) was added DIEA (11.45 mg, 88.63 µmol, 15.44 µL, 3.0 eq) and compound 2 (0.030 g, 29.54 µmol, 1 eq). The mixture was stirred at 15 °C for 16 hr. LC-MS showed compound 2 was consumed completely and one main peak with desired mass was detected. The mixture was directly purified by preparative HPLC (TFA condition). Compound BCY6064 (28.40 mg, 7.30 µmol, 24.71% yield) was obtained as a white solid.

BCY6064 Analytical Data
Mobile Phase:	A: 0.1% TFA in H2O B: 0.1%TFA in ACN
Flow:	1.0ml/min
Column:	Gemini-NX C18 5um 110A 150*4.6mm
Instrument:	Agilent 1200 HPLC-BE(1-614)
Method:	28-68% B over 30 minutes, then 3 min 95% B
Retention Time:	10.26 min
LCMS (ESI):
Peptide mw	3889.89

BCY6105 (Reference Compound)

General procedure for preparation of Compound 2

To a solution of compound 1 (3.5 g, 5.68 mmol, 1.0 eq) in DCM (20 mL) and MeOH (10 mL), (4-aminophenyl)methanol (978.5 mg, 7.95 mmol, 1.4 eq) and EEDQ (2.81 g, 11.35 mmol, 2.0 eq) were added in the dark, and the mixture was stirred at 25 °C for 18 hr. LC-MS showed compound 1 was consumed completely and one main peak with desired MS was detected ([M+H⁺]=722.0). The resulting reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by flash silica gel chromatography (ISCO^®; 220g SepaFlash^® Silica Flash Column, Eluent of 0~10% Methanol/Dichloromethane @ 80 mL/min). Compound 2 (3.0 g, 4.16 mmol, 73.2% yield) was obtained as a yellow solid.

General procedure for preparation of Compound 3

To a solution of compound 2 (2.5 g, 3.46 mmol, 1.0 eq) in THF (30 mL) was added DIEA (2.69 g, 20.78 mmol, 3.62 mL, 6.0 eq) and bis(4-nitrophenyl) carbonate (6.32 g, 20.78 mmol, 6.0 eq), and the mixture was stirred at 25 °C for 16 hr. TLC indicated compound 2 was consumed completely and one new spot formed. The reaction was clean according to TLC. The reaction mixture was concentrated under reduced pressure to give a residue. The residue was purified by flash silica gel chromatography (ISCO^®; 220 g SepaFlash^® Silica Flash Column, Eluent of 0~5% Methanol/Dichloromethane @ 100 mL/min). Compound 3 (2.2 g, 2.48 mmol, 71.6% yield) was obtained as a yellow solid.

General procedure for preparation of Compound 4

To a solution of compound 3 (0.3 g, 338.24 umol, 1.0 eq) in DMF (5 mL), HOBt (50.3 mg, 372.06 umol, 1.1 eq), DIEA (131.1 mg, 1.01 mmol, 176.7 µL, 3.0 eq), and MMAE (218.6 mg, 304.42 umol, 0.9 eq) were added. The mixture was stirred at 40 °C for 16 hr. LC-MS showed one peak with desired MS ([M+H⁺]=1466.4, [M+2H⁺]/2=733.2). The reaction mixture was then directly purified by prep-HPLC (neutral condition), and compound 4 (0.2 g, 136.44 umol, 40.3% yield) was obtained as a white solid.

General procedure for preparation of Compound 5

Compound 4 (0.175 g, 119.39 umol, 1.0 eq) was first dissolved in TFA (1.8 mL), and then triisopropylsilane (13.5 g, 85.20 mmol, 17.5 mL, 713.7 eq) was added. The mixture was stirred at 0 °C for 30 min. LC-MS showed one peak with desired MS ([M+H⁺]=1123.4, [M+2H⁺]/2=562.2). The reaction mixture was concentrated under reduced pressure to remove solvent to give a residue. The residue was purified by prep-HPLC (neutral condition). Compound 5 (0.1 g, 89.02 umol, 74.6% yield) was obtained as a yellow solid.

General procedure for preparation of Compound 6

To a solution of compound 5 (0.07 g, 62.31 umol, 1.0 eq) in DMA (1.0 mL), DIEA (24.2 mg, 186.94 umol, 32.6 µL, 3.0 eq) and tetrahydropyran-2,6-dione (14.2 mg, 124.62 umol, 2.0 eq) were added. The mixture was stirred at 25 °C for 2 hr. LC-MS showed compound 5 was consumed completely and one main peak with desired MS was detected ([M+H⁺]=1237.4, [M+2H⁺]/2=619.3). The reaction mixture was then directly purified by prep-HPLC (neutral condition), and compound 6 (0.04 g, 32.32 umol, 51.8% yield) was obtained as a light yellow solid.

General procedure for preparation of Compound 7

To a solution of compound 6 (0.04 g, 32.32 umol, 1.0 eq), 1-hydroxypyrrolidine-2,5-dione (11.2 mg, 96.97 umol, 3.0 eq) in DMA (3.0 mL) and DCM (1.0 mL), EDCI (18.6 mg, 96.97 umol, 3.0 eq) was added. The mixture was stirred at 25 °C for 18 hr. LC-MS showed compound 6 was consumed completely and one main peak with desired MS was detected ([M+H⁺]=1334.5, [M+2H⁺]/2=667.7). The reaction mixture was then directly purified by prep-HPLC (TFA condition), and compound 7 (0.025 g, 18.73 umol, 57.9% yield) was obtained as a white solid.

General procedure for preparation of BCY6105

To a solution of BCY6014 (82.0 mg, 26.98 umol, 1.2 eq) in DMA (4 mL), DIEA (8.7 mg, 67.44 umol, 11.7 µL, 3.0 eq) and compound 7 (0.03 g, 22.48 umol, 1.0 eq) were added. The mixture was stirred at 25 °C for 18 hr. LC-MS showed compound 7 was consumed completely and one main peak with desired MS was detected ([M+4H⁺]/4=1065.2). The reaction mixture was then directly purified by prep-HPLC (TFA condition). Compound BCY6105 (0.024 g, 5.41 umol, 24.1% yield, 96.06% purity) was obtained as a white solid.

BCY6106 (Reference Compound)

General procedure for preparation of Compound 2

To a solution of compound 1 (5.0 g, 10.67 mmol, 1.0 eq) in DCM (30 mL) and MeOH (10 mL), EEDQ (5.28 g, 21.34 mmol, 2.0 eq) and (4-aminophenyl)methanol (2.63 g, 21.34 mmol, 2.0 eq) were added. The mixture was stirred at 20 °C for 18 hr. LC-MS showed compound 1 was consumed completely and one main peak with desired MS was detected (desired m/z=574, while Boc group falling off and partially falling off corresponded to m/z=474 and 518, respectively). The reaction mixture was concentrated under reduced pressure to remove solvent to give a residue. The residue was purified by prep-HPLC (neutral condition). Compound 2 (3.7 g, 6.45 mmol, 60.4% yield) was obtained as a yellow solid.

General procedure for preparation of Compound 3

To a solution of compound 2 (3.4 g, 5.93 mmol, 1.0 eq) in DMF (20 mL) was added DIEA (5.36 g, 41.49 mmol, 7.23 mL, 7.0 eq) and bis(4-nitrophenyl) carbonate (10.82 g, 35.56 mmol, 6.0 eq) in one part. The mixture was stirred at 25 °C for 2 hr. LC-MS showed one peak with desired MS (m/z=639 corresponded to the mass with Boc group falling off during ESI). The reaction mixture was directly purified by prep-HPLC (neutral condition). Compound 3 (3.0 g, 4.06 mmol, 68.5% yield) was obtained as a yellow solid.

General procedure for preparation of Compound 4

To a solution of compound 3 (707.4 mg, 957.55 umol, 1.0 eq) in DMF (15 mL), HOBt (155.3 mg, 1.15 mmol, 1.2 eq), DIEA (371.3 mg, 2.87 mmol, 500.4 µL, 3.0 eq), and MMAE (0.55 g, 766.04 umol, 0.8 eq) were added. The mixture was stirred at 30 °C for 16 hr. LC-MS showed one peak with desired MS (desired m/z=1317, and m/z=609 corresponded to the mass with two protons and Boc group falling off during ESI). The reaction mixture was then directly purified by prep-HPLC (neutral condition). Compound 4 (0.53 g, 402.23 umol, 42.0% yield) was obtained as a yellow solid.

General procedure for preparation of Compound 5

To a solution of compound 4 (0.526 g, 399.20 umol, 1.0 eq) in DMF (4 mL), piperidine (862.2 mg, 10.13 mmol, 1.0 mL, 25.4 eq) was added. The mixture was stirred at 25 °C for 30 min. LC-MS showed compound 4 was consumed completely and one main peak with desired MS was

detected (desired m/z=1095, and m/z=265 corresponded to Fmoc-piperidine adduct). The reaction mixture was then directly purified by prep-HPLC (neutral condition). Compound 5 (0.230 g, 209.97 umol, 52.6% yield) was obtained as a white solid.

General procedure for preparation of Compound 6

To a solution of Fmoc-(D-Ala)-Phe-OH (125.6 mg, 273.87 umol, 1.2 eq) in DMF (10 mL), EDCI (52.5 mg, 273.87 umol, 1.2 eq), HOBt (37.0 mg, 273.87 umol, 1.2 eq), and compound 5 (0.25 g, 228.23 umol, 1 eq) were added. The mixture was stirred at 25 °C for 3 hr. LC-MS showed compound 5 was consumed completely and one peak with desired MS was detected (m/z=718 corresponded to the mass with two protons and Boc group falling off during ESI). The reaction mixture was then directly purified by prep-HPLC (neutral condition). Compound 6 (0.18 g, 117.20 umol, 51.3% yield) was obtained as a white solid.

General procedure for preparation of Compound 7

To a solution of compound 6 (0.18 g, 117.20 umol, 1.0 eq) in DMF (8 mL), piperidine (1.72 g, 20.25 mmol, 2.0 mL, 172.8 eq) was added. The mixture was stirred at 25 °C for 1 hr. LC-MS showed compound 7 was consumed completely and one main peak with desired MS was detected (m/z=1314 and 657 corresponded to the desired mass, and m/z=265 corresponded to Fmoc-piperidine adduct). The reaction mixture was then directly purified by prep-HPLC (neutral condition). Compound 7 (0.13 g, 98.96 umol, 84.4% yield) was obtained as a white solid.

General procedure for preparation of Compound 8

To a solution of compound 7 (0.105 g, 79.93 umol, 1.0 eq) in DMA (4 mL), DIEA (31.0 mg, 239.79 umol, 41.8 µL, 3.0 eq) and tetrahydropyran-2,6-dione (27.4 mg, 239.79 umol, 3.0 eq) were added. The mixture was stirred at 25 °C for 2 hr. LC-MS showed compound 7 was consumed completely and one main peak with desired MS was detected (m/z 664.5 corresponded to the mass with two protons and Boc group falling off during ESI). The reaction mixture was then directly purified by prep-HPLC (neutral condition), and compound 8 (0.09 g, 63.04 umol, 78.8% yield) was obtained as a white solid.

General procedure for preparation of Compound 9

To a solution of compound 8 (0.09 g, 63.04 umol, 1.0 eq), 1-hydroxypyrrolidine-2,5-dione (21.7 mg, 189.11 umol, 3.0 eq) in DMA (3 mL) and DCM (1 mL), EDCI (36.2 mg, 189.11 umol, 3.0 eq) dissolved in 1 mL DCM was added. The mixture was stirred at 25 °C for 18 hr. LC-MS showed compound 8 was consumed completely and one main peak with desired MS was detected (desired m/z=1524 (one proton) and 763 (two protons), while m/z=713 corresponded to the mass with Boc group falling off during ESI). The reaction mixture was directly purified by prep-HPLC (neutral condition). Compound 9 (0.07 g, 45.91 umol, 72.8% yield) was obtained as a white solid.

General procedure for preparation of Compound 10

To a solution of BCY6014 (167.5 mg, 55.09 umol, 1.2 eq) in DMF (3 mL), DIEA (11.8 mg, 91.81 umol, 16.0 µL, 2.0 eq) and compound 9 (0.07 g, 45.91 umol, 1.0 eq) were added. The mixture was stirred at 25 °C for 16 hr. LC-MS showed compound 9 was consumed completely and one main peak with desired MS was detected ([M+4H+]/4=1112.9, [M+5H+]/5=890.5). The reaction mixture was concentrated under reduced pressure to remove solvent to give a residue. The crude product 10 (0.220 g, crude) was used in the next step without further purification.

General procedure for preparation of BCY6106

To a solution of compound 10 (0.200 g, 44.95 umol, 1.0 eq) in DCM (4 mL), 1 mL TFA was added. The mixture was stirred at 25 °C for 1 hr. LC-MS showed one main peak with desired MS ([M+4H⁺]/4=1088.0, [M+5H⁺]/5=870.8). The reaction mixture was concentrated under reduced pressure to give a residue, which was then directly purified by prep-HPLC (TFA condition). Compound BCY6106 (0.0297 g, 20.06 umol, 14.5% yield, 95.46% purity) was obtained as a white solid.

BCY6175 (Reference Compound)

General procedure for preparation of Compound 9

The synthesis of Compound 9 was performed in an analogous to manner to that described in BCY6106.

General procedure for preparation of Compound 10A

To a solution of BCY6099 (195.15 mg, 61.32 µmol, 1.1 eq) in DMA (3 mL) were added DIEA (21.61 mg, 167.23 µmol, 29.13 µL, 3 eq) and compound 9 (0.085 g, 55.74 µmol, 1.0 eq). The mixture was stirred at 25 °C for 16 hr. LC-MS showed compound 9 was consumed completely and one main peak with desired m/z was detected. The reaction mixture was concentrated under reduced pressure to remove solvent to afford a residue (light yellow oil). The reaction was directly purified by prep-HPLC (neutral condition). Compound 10A (0.160 g, 34.84 µmol, 62.50% yield) was obtained as a white solid.

General procedure for preparation of BCY6175

To a solution of compound 10A in DCM (4.5 mL) was added TFA (4.5 mL). The mixture was stirred at 0 °C for 30 min. LC-MS showed compound 10A was consumed completely and one main peak with desired m/z was detected. The reaction mixture was concentrated under reduced pressure to remove solvent to afford a residue, which was purified by prep-HPLC (TFA condition). Compound BCY6175 (61.40 mg, 13.56 µmol, 31.13% yield) was obtained as a white solid.

BCY6107 (Reference Compound)

General procedure for preparation of Compound 2

To a solution of compound 1 (3.0 g, 8.49 mmol, 1.0 eq) in DCM (30 mL) and MeOH (10 mL), EEDQ (2.52 g, 10.19 mmol, 1.2 eq) and (4-aminophenyl)methanol (1.25 g, 10.19 mmol, 1.2 eq) were added. The mixture was stirred at 25 °C for 16 hr. LC-MS showed compound 1 was consumed completely and one main peak with desired MS was detected ([M+H]⁺ 459.5). In addition, TLC indicated compound 1 was consumed completely and new spots formed. The reaction mixture was concentrated under reduced pressure to remove solvent to give a residue. The residue was purified by flash silica gel chromatography (ISCO^®; 120 g SepaFlash^® Silica Flash Column, Eluent of 0-60% Ethylacetate/Petroleum ethergradient @ 80 mL/min). Compound 2 (3.5 g, 7.63 mmol, 89.9% yield) was obtained as a yellow solid.

General procedure for preparation of Compound 3

To a solution of compound 2 (3.3 g, 7.20 mmol, 1.0 eq) in THF (100 mL), DIEA (4.65 g, 35.98 mmol, 6.27 mL, 5.0 eq) and bis(4-nitrophenyl) carbonate (8.76 g, 28.79 mmol, 4.0 eq) were added. The mixture was stirred at 25 °C for 16 hr. LC-MS showed compound 2 was consumed completely and one main peak with desired MS was detected ([M+H]⁺ 624.0). In addition, TLC indicated compound 2 was consumed completely and new spots formed. The reaction mixture was concentrated under reduced pressure to remove solvent to give a residue. The residue was purified by flash silica gel chromatography (ISCO^®; 120 g SepaFlash^® Silica Flash Column, Eluent of 0-15% Ethylacetate/Petroleum ethergradient @ 80 mL/min). Compound 3 (3.0 g, 4.81 mmol, 66.8% yield) was obtained as a yellow solid.

General procedure for preparation of Compound 4

To a solution of compound 3 (124.09 mg, 198.97 umol, 1.0 eq) in DMF (5 mL), HOBt (32.3 mg, 238.77 umol, 1.2 eq), DIEA (77.1 mg, 596.92 µmol, 103.9 µL, 3.0 eq), and MMAE (0.1 g, 139.28 umol, 0.7 eq) were added. The mixture was stirred at 25°C for 1 hr. LC-MS showed compound 3 was consumed completely and one main peak with desired MS was detected ([M+H]⁺ 1202.5, [M+Na]⁺ 1224.5). The reaction mixture was then directly purified by prep-HPLC (neutral condition). After lyophilization, compound 4 (0.08 g, 66.53 umol, 33.4% yield) was obtained as a white solid.

General procedure for preparation of Compound 5

To a solution of compound 4 (0.08 g, 66.53 umol, 1.0 eq) in DMF (4 mL), piperidine (862.2 mg, 10.13 mmol, 1 mL, 152.2 eq) was added. The mixture was stirred at 25 °C for 1 hr. LC-MS showed compound 4 was consumed completely and one main peak with desired MS was detected ([M+H]⁺ 981.5, [M+Na]⁺ 1003.5, while m/z=264.0 corresponded to Fmoc-piperidine adduct). The reaction mixture was directly purified by prep-HPLC (neutral condition). Compound 5 (0.055 g, 56.11 umol, 84.3% yield) was obtained as a white solid.

General procedure for preparation of Compound 6

To a solution of Fmoc-Glu(t-Bu)-Pro-Cit-Gly-HPhe-Tyr(t-Bu)-OH (74.1 mg, 66.31 umol, 1.3 eq) in DMF (4 mL), EOCI (12.7 mg, 66.31 umol, 1.3 eq), HOBt (8.9 mg, 66.31 umol, 1.3 eq), and compound 5 (0.05 g, 51.01 umol, 1.0 eq) were added. The mixture was stirred at 25 °C for 30 min. LC-MS indicated 20% of compound 5 remained, several new peaks formed, and 60% of the reaction mixture was desired product ([M+2H⁺]/2=1040.4). The reaction mixture was directly purified by prep-HPLC (neutral condition). Compound 6 (0.07 g, 33.66 umol, 66.0% yield) was obtained as a white solid.

General procedure for preparation of Compound 7

To a solution of compound 6 (0.07 g, 33.66 umol, 1.0 eq) in DMF (4 mL), piperidine (2.9 mg, 33.66 umol, 3.3 µL, 1.0 eq) was added. The mixture was stirred at 25 °C for 15 min. LC-MS showed compound 6 was consumed completely and one main peak with desired MS was detected ([M+2H⁺]/2=929.1, while m/z=264.2 corresponded to Fmoc-piperidine adduct). The reaction mixture was directly purified by prep-HPLC (neutral condition). Compound 7 (0.045 g, 24.23 umol, 72.0% yield) was obtained as a white solid.

General procedure for preparation of Compound 8

To a solution of compound 7 (0.04 g, 21.54 umol, 1.0 eq) in DMA (1 mL), DIEA (8.3 mg, 64.61 umol, 11.2 µL, 3.0 eq) and tetrahydropyran-2,6-dione (7.4 mg, 64.61 umol, 3.0 eq) were added. The mixture was stirred at 25 °C for 1 hr. LC-MS showed compound 7 was consumed completely and one main peak with desired MS was detected ([M+2H⁺]/2=986.4). The reaction mixture was then directly purified by prep-HPLC (neutral condition). Compound 8 (0.035 g, 17.75 umol, 82.4% yield) was obtained as a white solid.

General procedure for preparation of Compound 9

To a solution of compound 8 (0.035 g, 17.75 umol, 1.0 eq), 1-hydroxypyrrolidine-2,5-dione (6.1 mg, 53.26 umol, 3.0 eq) in DMA (3 mL) and DCM (1 mL), EDCI (10.2 mg, 53.26 umol, 3.0 eq) was added. The mixture was stirred at 25 °C for 16 hr. LC-MS showed compound 8 was partially remained and one peak with desired MS was detected ([M+2H+]/2=1034.7). DCM was then removed, following by mixture being purified by prep-HPLC (neutral condition). Compound 9 (0.03 g, 14.50 umol, 81.7% yield) was obtained as a white solid.

General procedure for preparation of Compound 10

To a solution of BCY6014 (52.9 mg, 17.40 umol, 1.59 µL, 1.2 eq) in DMF (2 mL), DIEA (5.6 mg, 43.51 umol, 7.6 µL, 3.0 eq) and compound 9 (0.03 g, 14.50 umol, 1.0 eq) were added. The mixture was stirred at 25 °C for 16 hr. LC-MS showed one main peak with desired MS ([M+4H+]/4=1249.2, [M+5H+]/5=999.3). The solvent was then removed and the resulting crude product 10 (0.06 g, crude) was used into the next step without further purification.

General procedure for preparation of BCY6107

To a solution of compound 10 (0.055 g, 11.01 umol, 1.0 eq) in DCM (1 mL), 1 mL TFA was added. The mixture was stirred at 0 °C for 15 min. LC-MS showed compound 10 was consumed completely and one main peak with desired MS was detected ([M+4H+]/4=1221.0, [M+5H+]/5=977.0). The reaction mixture was concentrated under reduced pressure to remove solvent, resulting a residue which was then directly purified by prep-HPLC (TFA condition). Compound BCY6107 (20.4 mg, 4.03 umol, 36.6% yield, 96.36% purity) was obtained as a white solid.

BIOLOGICAL DATA Study 1: Fluorescence polarisation measurements (a) Direct Binding Assay

Peptides with a fluorescent tag (either fluorescein, SIGMA or Alexa Fluor488^™, Fisher Scientific) were diluted to 2.5nM in PBS with 0.01% tween 20 or 50mM HEPES with 100mM NaCl and 0.01% tween pH 7.4 (both referred to as assay buffer). This was combined with a titration of protein in the same assay buffer as the peptide to give 1nM peptide in a total volume of 25µL in a black walled and bottomed low bind low volume 384 well plates, typically 5µL assay buffer, 10µL protein (Table 1) then 10µL fluorescent peptide. One in two serial dilutions were used to give 12 different concentrations with top concentrations ranging from 500nM for known high affinity binders to 10µM for low affinity binders and selectivity assays. Measurements were conducted on a BMG PHERAstar FS equipped with an "FP 485 520 520" optic module which excites at 485nm and detects parallel and perpendicular emission at 520nm. The PHERAstar FS was set at 25°C with 200 flashes per well and a positioning delay of 0.1 second, with each well measured at 5 to 10 minute intervals for 60 minutes. The gain used for analysis was determined for each tracer at the end of the 60 minutes where there was no protein in the well. Data was analysed using Systat Sigmaplot version 12.0. mP values were fit to a user defined quadratic equation to generate a Kd value: f = ymin+(ymaxymin)/Lig*((x+Lig+Kd)/2-sqrt((((x+Lig+Kd)/2)^2)-(Lig*x))). "Lig" was a defined value of the concentration of tracer used.

(b) Competition Binding Assay

Peptides without a fluorescent tag were tested in competition with a peptide with a fluorescent tag and a known Kd (Table 2). Reference Compound A has the sequence Fl-G-Sar₅-ACPWGPAWCPVNRPGCA (FI-G-Sar₅-(SEQ ID NO: 94)). Reference Compound B has the sequence Fl-G-Sar₅-ACPWGPFWCPVNRPGCA (Fl-G-Sar₅-(SEQ ID NO: 95)). Reference Compound C has the sequence Fl-G-Sar₅-ADVTCPWGPFWCPVNRPGCA (Fl-G-Sar₅-(SEQ ID NO: 96). Each of Reference Compounds A, B and C contain a TBMB molecular scaffold. Peptides were diluted to an appropriate concentration in assay buffer as described in the direct binding assay with a maximum of 5% DMSO, then serially diluted 1 in 2. Five µL of diluted peptide was added to the plate followed by 10µL of human or mouse EphA2 (Table 1) at a fixed concentration which was dependent on the fluorescent peptide used (Table 2), then 10µL fluorescent peptide added. Measurements were conducted as for the direct binding assay, however the gain was determined prior to the first measurement. Data analysis was in Systat

Sigmaplot version 12.0 where the mP values were fit to a user defined cubic equation to generate a Ki value: f=ymin+(ymax-ymin)/Lig*((Lig*((2*((Klig+Kcomp+Lig+Comp-Prot*c)"2-3*(Kcomp*(Lig-Prot*c)+Klig*(Comp-Prot*c)+Klig*Kcomp))^0.5*COS(ARCCOS((-2*(Klig+Kcomp+Lig+Comp-Prot*c)^3+9*(Klig+Kcomp+Lig+Comp-Prot*c)*(Kcomp*(Lig-Prot*c)+Klig*(Comp-Prot*c)+Klig*Kcomp)-27*(-1*Klig*Kcomp*Prot*c))/(2*((((Klig+Kcomp+Lig+Comp-Prot*c)^2-3*(Kcomp*(Lig-Prot*c)+Klig*(Comp-Prot*c)+Klig*Kcomp))^3)^0.5)))/3))-(Klig+Kcomp+Lig+Comp-Prot*c)))/((3*Klig)+((2*((Klig+Kcomp+Lig+Comp-Prot*c)^2-3*(Kcomp*(Lig-Prot*c)+Klig*(Comp-Prot*c)+Klig*Kcomp))^0.5*COS(ARCCOS((-2*(Klig+Kcomp+Lig+Comp-Prot*c)^3+9*(Klig+Kcomp+Lig+Comp-Prot*c)*(Kcomp*(Lig-Prot*c)+Klig*(Comp-Prot*c)+Klig*Kcomp)-27*(-1*Klig*Kcomp*Prot*c))/(2*((((Klig+Kcomp+Lig+Comp-Prot*c)^2-3*(Kcomp*(Lig-Prot*c)+Klig*(Comp-Prot*c)+Klig*Kcomp))*3)^0.5)))/3))-(Klig+ Kcomp+Lig+Comp-Prot*c)))). "Lig", "KLig" and "Prot" were all defined values relating to: fluorescent peptide concentration, the Kd of the fluorescent peptide and EphA2 concentration respectively. Table 1: Ephrin receptors and source

EphA1 (Ecto)	Human	Fc fusion	R&D systems	7146-A1
EphA2 (Ecto)	Human	C-terminal polyHis	R&D systems	3035-A2
EphA2 (Ecto)	Human	C-terminal polyHis	In-house	N/A
EphA2 (Ecto)	Mouse	Fc fusion	R&D Systems	639-A2
EphA2 (Ecto)	Mouse	C-terminal polyHis	Sino Biological	50586-M08H
EphA2 (ligand binding)	Rat	C-terminal polyHis	In-house	N/A
EphA2 (ligand binding)	Dog	C-terminal polyHis	In-house	N/A
EphA3 (Ecto)	Human	Fc fusion	R&D systems	6444-A3
EphA3 (Ecto)	Human	N-terminal polyHis	In-house	N/A
EphA3 (Ecto)	Rat	C-terminal polyHis	Sino Biological	80465-R08H
EphA4 (Ecto)	Human	Fc fusion	R&D systems	6827-A4
EphA4 (Ecto)	Human	C-terminal polyHis	Sino Biological	11314-H08H
EphA4 (Ecto)	Rat	C-terminal polyHis	Sino Biological	80123-R08H
EphA6 (Ecto)	Human	Fc fusion	R&D systems	5606-A6
EphA7 (Ecto)	Human	Fc fusion	R&D systems	6756-A7
EphB1 (Ecto)	Rat	Fc fusion	R&D systems	1596-B1
EphB4 (Ecto)	human	C-terminal polyHis	R&D systems	3038-B4

Table 2: Final concentrations of fluorescent peptide and EphA2 as used with Competition Binding Assays

Reference Compound A	10	75
Reference Compound B	1	30
Reference Compound C	0.8 (human) 1 (mouse)	2.4	50

Certain peptide ligands were tested in the above mentioned assays and the results are shown in Tables 3-7: Table 3: Biological Assay Data for Peptide Ligands (TATA peptides, Direct Binding Assay)

1		304 ± 91.99
2		74.91 ± 6.6
3		129.8 ± 80.75
4		124.6 ± 51.74
5		93.95 ± 23.62
6		168.5 ± 20.58
7		149.73 ± 39.2
8		218.33 ± 10.51
9		6.43 ± 1.15
10		9.07 ± 2.49
11		3.08 ± 0.43
12		10.56 ± 0.77
13		5.29 ± 0.79
14		9.96 ± 0.55

Table 4: Biological Assay Data for Peptide Ligands (TATA peptides, Competition Binding Assay)

		15	ACMNDWWCAMGWKCA (SEQ ID NO: 3)	277.5 ± 38.22
16	ACVPDRRCAYMNVCA (SEQ ID NO: 4)	69.97 ± 8.67
17		85.05 ± 1.08
18	DLRCGGDPRCAYMNVCA (SEQ ID NO: 17)	70.8 ± 2.35
19	SRPCVIDSRCAYMNVCA (SEQ ID NO: 18)	94.75 ± 24.01
20	ESRCSPDARCAYMNVCA (SEQ ID NO: 19)	57.05 ± 4.61
21	HSGCRPDPRCAYMNVCA (SEQ ID NO: 20)	62.15 ± 4.61
22	GSGCKPDSRCAYMNVCA (SEQ ID NO: 21)	63.25 ± 13.82
23	ETVCLPDSRCAYMNVCA (SEQ ID NO: 22)	130 ± 15.68
24	GQVCIVDARCAYMNVCA (SEQ ID NO: 23)	168.5 ± 16.66
25	ACVPDRRCAFENVCVDH (SEQ ID NO: 24)	97.3 ± 3.33
26	ACVPDRRCAFMNVCEDR (SEQ ID NO: 25)	39.05 ± 10.29
27	ACVPDRRCAFQDVCDHE (SEQ ID NO: 26)	159 n=1
28	ACVPDRRCAFRDVCLTG (SEQ ID NO: 27)	1700 n=1
29	ACYVGKECAYMNVCA (SEQ ID NO: 9)	209.5 ± 110.74	106.65 ± 24.94	87.7 n=1
30	ACQPSNHCAFMNYCA (SEQ ID NO: 28)	293 n=1	186.53 ± 86.86	137 n=1
31	ACSPTPACAVQNLCA (SEQ ID NO: 29)	223 n=1	177 ± 60.76
32	ACTSCWAYPDSFCA (SEQ ID NO: 30)	232 ± 52.19	151 n=1
33	ACTKPTGFCAYPDTICA (SEQ ID NO: 31)	268.5 ± 16.66
34	ACRGEWGYCAYPDTICA (SEQ ID NO: 32)	347.5 ± 57.82
35	ACRNWGMYCAYPDTICA (SEQ ID NO: 33)	282.5 ± 65.66
36	ACPDWGKYCAYPDTICA (SEQ ID NO: 34)	160 ± 1.96
37	ACRVYGPYCAYPDTICA (SEQ ID NO: 35)	294.5 ± 20.58
38	ACSSCWAYPDSVCA (SEQ ID NO: 36)	400.33 ± 205.19
39	ACQSCWAYPDTYCA (SEQ ID NO: 37)	321.33 ± 119.53
40	ACGFMGLEPCETFCA (SEQ ID NO: 38)	187.5 ± 20.58
41	ACGFMGLVPCEVHCA (SEQ ID NO: 39)	155 ± 9.8
42	ACGFMGLEPCEMVCA (SEQ ID NO: 40)	320.5 ± 14.7
43	ACGFMGLEPCVTYCA (SEQ ID NO: 41)	233.5 ± 20.58
44	ACGFMGLEPCELVCA (SEQ ID NO: 42)	126.8 ± 21.17
45	ACGFMGLVPCNVFCA (SEQ ID NO: 43)	142 ± 41.16
46	ACGFMGLEPCELFCA (SEQ ID NO: 44)	81.7 ± 7.06
47	ACGFMGLEPCELFCMPK (SEQ ID NO: 45)	185 ± 74.48
48	ACGFMGLEPCELYCA (SEQ ID NO: 46)	127.5 ± 14.7
49	ACGFMGLEPCELYCAHT (SEQ ID NO: 47)	144 ± 17.64
50	ACGFMGLEPCEMYCA (SEQ ID NO: 48)	140 ± 45.08
51	ACGFMGLVPCELYCADN (SEQ ID NO: 49)	84.4 ± 36.46
52	ACPLVNPLCLTSGWKCA (SEQ ID NO: 50)	115.33 ± 11.33
53	ACPMVNPLCLHPGWICA (SEQ ID NO: 51)	15.4 ± 3.17
54	ACPLVNPLCLHPGWICA (SEQ ID NO: 52)	15.25 ± 2.84
55	ACPLVNPLCLHPGWRCA (SEQ ID NO: 53)	20.55 ± 0.88
56	ACPLVNPLCNLPGWTCA (SEQ ID NO: 54)	184 ± 115.64
57	ACPLVNPLCLVPGWSCA (SEQ ID NO: 55)	35.4 ± 10
58	ACPLVNPLCLLDGWTCA (SEQ ID NO: 56)	38.35 ± 5.39
59	ACPLVNPLCLMPGWGCA (SEQ ID NO: 57)	114.5 ± 10.78
60	ACPLVNPLCMIGNWTCA (SEQ ID NO: 58)	96.2 ± 0.59
61	ACPLVNPLCLMTGWSCA (SEQ ID NO: 59)	241.5 ± 44.1
62	ACPLVNPLCMMGGWKCA (SEQ ID NO: 60)	67.1 ± 19.21
63	ACPLVNPLCLYGSWKCA (SEQ ID NO: 61)	59.05 ± 28.32
64	ACPLVNPLCLHPGWTCA (SEQ ID NO: 62)	30 n=1
65	ARDCPLVNPLCLHPGWTCA (SEQ ID NO: 63)	6.05 ± 1.38	39.1 ± 0.39
66 (BCY6099)		4.94 ± 1.41	57.6 ± 24.86
67 (BCY6014)		8.51 ± 0.17	61.7 ± 15.48
68		19.3 ± 4.92	166.5 ± 30.38
69		17.5 ± 0.98	164.5 ± 2.94
70	RPACPLVNPLCLHPGWTCA (SEQ ID NO: 64)	10.06 ± 2.96
71	RPPCPLVNPLCLHPGWTCA (SEQ ID NO: 65)	11.11 ± 2.25
72	KHSCPLVNPLCLHPGWTCA (SEQ ID NO: 66)	11.92 ± 6.04
73	ACPLVNPLCLHPGWTCLHG (SEQ ID NO: 67)	1.98 ± 0.49	7.27 ± 1.09
74	Ac-CPLVNPLCLHPGWTCLHG (Ac-(SEQ ID NO: 12))	1.76 ± 0.54
75		2.48 ± 0.27	18 ± 1.18
76		10.01 ± 1.55	75.15 ± 14.41
77 (BCY6019)		5.41 ± 0.86	48.23 ± 15.72
78		15.6 ± 4.7	115.03 ± 41.16
79		162 ± 17.64
80	RHDCPLVNPLCLLPGWTCA (SEQ ID NO: 70)	7.11 ± 0.72
81	TPRCPLVNPLCLMPGWTCA (SEQ ID NO: 71)	9.8 ± 2.61
82	ACPLVNPLCLAPGWTCA (SEQ ID NO: 72)	46.2 n=1
83	ACPLVNPLCLAPGWTCSRS (SEQ ID NO: 73)	7.05 ± 1.11
84	ACPLVNPLCLEPGWTCA (SEQ ID NO: 74)	53.9 n=1
85	ACPLVNPLCLEPGWTCAKR (SEQ ID NO: 75)	10.95 ± 1.6
86	ACPLVNPLCLHPGWSCA (SEQ ID NO: 76)	56.15 ± 11.27
87 (BCY6026)	ACPLVNPLCLHPGWSCRGQ (SEQ ID NO: 77)	2.57 ± 0.63	18.6 ± 0.59
88	Ac-CPLVNPLCLHPGWSCRGQ (Ac-(SEQ ID NO: 14))	1.64 ± 0.75
89		2.86 ± 1.29	29.55 ± 4.61
90		5.41 ± 0.67	47.05 ± 11.47
91 (BCY6042)		5.98 ± 1.42	49.87 ± 14.44
92		10.56 ± 6.56	75.27 ± 21.72
93	ACPLVNPLCLHPG(2Nal)SCRGQ (SEQ ID NO: 79)	228 ± 103.88
94	ACPLVNPLCLTPGWTCTNT (SEQ ID NO: 80)	13.25 ± 4.05
95	ACPMVNPLCLHPGWKCA (SEQ ID NO: 81)	11.91 ± 3.73
96	ACPMVNPLCLTPGWICA (SEQ ID NO: 82)	16.07 ± 4.58
97	ACPMVNPLCLHPGWTCA (SEQ ID NO: 83)	20 ± 1.02

Table 5: Biological Assay Data for TATA Peptide Ligands (Competition Binding Assay)

98		251.5 ± 73.5

Table 6: Biological Assay Data for Peptide Ligands (BDC competition binding data with TATA Scaffolds)

BCY6027	BCY6099	Formula (A)	10.23
BCY6028	BCY6099	Formula (B)	13.04
BCY6031	BCY6014	Formula (A)	12.62	34.70
BCY6032	BCY6014	Formula (B)	11.42	35.90

Table 7: Selectivity Data for Peptide Ligands (Selectivity Direct Binding Assay)

2	516.5 ± 236.1 8	210 ± 1.96	>100 0	>100 0	>1000	10890 n=1	>600 0
7	216	252.5 ± 6.86
9	>3000
11	>3000
12	>3000
13	>3000
14	>3000

Study 2: Fluorescence polarisation measurements (Alternative Protocol) (a) Competition binding

Peptides without a fluorescent tag were tested in competition with a peptide with a fluorescent tag and a known Kd (Table 9). Five µL of increasing (2 fold) concentrations of test compound was added to the plate followed by 10µL of EphA2 protein (Table 8) at a fixed concentration which was dependent on the fluorescent peptide used (Table 9), then 10µL fluorescent peptide added. Buffer was assay buffer as above with DMSO <1%. Measurements were conducted on a BMG PHERAstar FS equipped with an "FP 485 520 520" optic module which excites at 485nm and detects parallel and perpendicular emission at 520nm. The PHERAstar FS was set at 25°C with 200 flashes per well and a positioning delay of 0.1 second, with each well measured at 5 to 10 minute intervals for 60 minutes. Alternatively, measurements were done on at similar time intervals on a Perkin Elmer Envision equipped with FITC FP Dual Mirror, FITC FP 480 excitation filter and FITC FP P-pol 535 and FITC FP S-pol emission filters with 30 flashes and a G-Factor of 1.2. Data analysis was in Systat Sigmaplot version 12.0 or 13.0 where the mP values at 60 minutes were fit to a user defined cubic equation to generate a Ki value: f=ymin+(ymax-ymin)/Lig*((Lig*((2*((Klig+Kcomp+Lig+Comp-Prot*c)^2-3*(Kcomp*(Lig- Prot*c)+Klig*(Comp-Prot*c)+Klig*Kcomp))^0.5*COS(ARCCOS((-2*(Klig+Kcomp+Lig+Comp- Prot*c)^3+9*(Klig+Kcomp+Lig+Comp-Prot*c)*(Kcomp*(Lig-Prot*c)+Klig*(Comp- Prot*c)+Klig*Kcomp)-27*(-1*Klig*Kcomp*Prot*c))/(2*((((Klig+Kcomp+Lig+Comp-Prot*c)^2- 3*(Kcomp*(Lig-Prot*c)+Klig*(Comp-Prot*c)+Klig*Kcomp))^3)^0.5)))/3))- (Klig+Kcomp+Lig+Comp-Prot*c)))/((3*Klig)+((2*((Klig+Kcomp+Lig+Comp-Prot*c)^2- 3*(Kcomp*(Lig-Prot*c)+Klig*(Comp-Prot*c)+Klig*Kcomp))^0.5*COS(ARCCOS((- 2*(Klig+Kcomp+Lig+Comp-Prot*c)^3+9*(Klig+Kcomp+Lig+Comp-Prot*c)*(Kcomp*(Lig- Prot*c)+Klig*(Comp-Prot*c)+Klig*Kcomp)-27*(- 1*Klig*Kcomp*Prot*c))/(2*((((Klig+Kcomp+Lig+Comp-Prot*c)^2-3*(Kcomp*(Lig- Prot*c)+Klig*(Comp-Prot*c)+Klig*Kcomp))^3)^0.5)))/3))-(Klig+Kcomp+Lig+Comp-Prot*c)))). "Lig", "KLig" and "Prot" were all defined values relating to: fluorescent peptide concentration, the Kd of the fluorescent peptide and EphA2 concentration respectively. Table 8: Eph receptors and source

EphA2 (Ecto)	Human	C-terminal polyHis	R&D systems	3035-A2
EphA2 (Ecto)	Human	C-terminal polyHis	In-house	N/A
EphA2 (Ecto)	Mouse	C-terminal polyHis	Sino Biological	50586-M08H
EphA2 (ligand binding)	Rat	C-terminal polyHis	In-house	N/A

Table 9: Final concentrations of fluorescent peptide and EphA2 as used with competition binding assays

Reference Compound C

0.8

2.4 or 25

50 or 15nM

25

Certain peptide ligands and bicycle drug conjugates were tested in the above mentioned competition binding assay and the results are shown in Tables 10 to 11: Table 10: Competition Binding with Selected Bicyclic Peptides

BCY6009 (Compound 108)	12.7	26.7	18.0
BCY6014 (Compound 67)	14.5	39.6	24.4
BCY6017 (Compound 109)	8.3
BCY6018 (Compound 110)	13.1
BCY6019 (Compound 77)	6.4	16.0
BCY6026 (Compound 87)	4.4
BCY6042 (Compound 91)	6.7
BCY6059	43.2
(Compound 106)
BCY6099 (Compound 66)	2.7	4.5	1.9
BCY6101 (Compound 101)	9.7	6.9
BCY6102 (Compound 102)	14.6	25.1
BCY6103 (Compound 100)	14.8	20.8
BCY6104 (Compound 99)	5.1	19.8
BCY6137 (Compound 105)	2.2
BCY6138 (Compound 104)	566.0
BCY6139 (Compound 103)	5.7
BCY6141 (Compound 112)	90.4
BCY6152 (Compound 111)	23.3
BCY6153 (Compound 113)	18.2
BCY6160 (Compound 107)	14.0
BCY6039	9.4
BCY6105	8.86
BCY6106	12.9
BCY6175	1
BCY6107	19.18

The results from the competition binding assay in Table 10 show that Bicycle peptides targeting human EphA2 (BCY6014 and BCY6099) bind with high affinity to mouse and rat EphA2. Similarly, BCY6019 binds to both human and mouse EphA2. These results show that certain peptides can be used in in vivo mouse and rat efficacy and toxicology models. Table 11: Competition Binding with Selected Bicycle Drug Conjugates (BDCs)

BCY6061	12.0	32.3	14.2
BCY6174	1.7	3.9	3.0
BCY6029	2.3
BCY6033	9.9	34.2	13.4
BCY6037	7.3
BCY6049	8.8	28.1
BCY6053	48.2	29.7
BCY6122	13.7	10.4
BCY6136	1.9	5.5	3.2
BCY6030	5.6
BCY6034	5.9	35.9
BCY6038	2.8
BCY6050	168.1	62.2
BCY6054	53.6	73.6
BCY6027	10.2
BCY6031	12.5	35.1	20.0
BCY6035	15.2
BCY6047	53.2	34.2
BCY6051	54.0	43.6
BCY6134	7.4	12.6
BCY6135	2.4	5.0	2.9
BCY6154	8.0
BCY6155	12.5
BCY6063	7.8	66.8
BCY6028	13.0
BCY6032	11.4	35.9
BCY6036	18.6
BCY6048	120.7	87.2
BCY6052	30.5	27.1
BCY6064	12.5	40.7
BCY6162	44.9
BCY6082	10.5	34.1	13.9
BCY6150	17.9
BCY6151	9.0
BCY6161	2.1
BCY6173	1.7	4.3	2.5
BCY6077	6.5	25.3
BCY6055	15.8
BCY6062	12.9	20.3

Table 11 shows that certain Bicycle Drug Conjugates exhibit excellent cross reactivity between human, mouse and rodent EphA2. Peptides can therefore be used in mouse and rat efficacy and toxicology in vivo models.

(b) SPR Measurements

Non-Fc fusion proteins were biotinylated with EZ-Link^™ Sulfo-NHS-LC-Biotin for 1 hour in 4mM sodium acetate, 100mM NaCl, pH 5.4 with a 3x molar excess of biotin over protein. The degree of labelling was determined using a Fluorescence Biotin Quantification Kit (Thermo) after dialysis of the reaction mixture into PBS. For analysis of peptide binding, a Biacore T200 instrument was used utilising a XanTec CMD500D chip. Streptavidin was immobilized on the chip using standard amine-coupling chemistry at 25°C with HBS-N (10 mM HEPES, 0.15 M NaCl, pH 7.4) as the running buffer. Briefly, the carboxymethyl dextran surface was activated with a 7 min injection of a 1:1 ratio of 0.4 M 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC)/0.1 M N-hydroxy succinimide (NHS) at a flow rate of 10 µl/min. For capture of streptavidin, the protein was diluted to 0.2 mg/ml in 10 mM sodium acetate (pH 4.5) and captured by injecting 120µl onto the activated chip surface. Residual activated groups were blocked with a 7 min injection of 1 M ethanolamine (pH 8.5):HBS-N (1:1). Buffer was changed to PBS/0.05% Tween 20 and biotinylated EphA2 was captured to a level of 500-1500 RU using a dilution of protein to 0.2µM in buffer. A dilution series of the peptides was prepared in this buffer with a final DMSO concentration of 0.5% with a top peptide concentration was 50 or 100nM and 6 further 2-fold dilutions. The SPR analysis was run at 25°C at a flow rate of 90µl/min with 60 seconds association and 900-1200 seconds dissociation. Data were corrected for DMSO excluded volume effects. All data were double-referenced for blank injections and reference surface using standard processing procedures and data processing and kinetic fitting were performed using Scrubber software, version 2.0c (BioLogic Software). Data were fitted using simple 1:1 binding model allowing for mass transport effects where appropriate.

For binding of Bicycle Drug Conjugates a Biacore 3000 instrument was used. For biotinylated proteins immobilisation levels were 1500 RU and the top concentration was 100nM. Otherwise the method was the same as described above using either the CMD500D or a CM5 chip (GE Healthcare). For the Fc-tagged proteins, a CM5 chip was activated as described above and then goat anti-human IgG antibody (Thermo-Fisher H10500) was diluted to 20µg/ml in 10mM sodium acetate pH5.0 and captured to approximately 3000 RU. The surface was then blocked as described above. Subsequent capture of the Fc-tagged proteins was carried out to obtain approximately 200-400 RU of the target protein. The proteins used are described below. All proteins were reconstituted as per manufacturer's suggested buffers and concentrations and captured using 5-10µg/ml protein in PBS/0.05% Tween 20. Table 12

EphA1	Human	Fc fusion	Sino Biologics	15789-H02H
EphA2	Human	0.95mol biotin/monomer	In house	N/A
EphA2	Mouse	Fc fusion	R&D Systems	639-A2
EphA2	Rat	1.4mol biotin/ monomer	In house	N/A
EphA3	Human	Fc fusion	R&D Systems	6444-A3
EphA3	Mouse	Fc fusion	Sino Biologics	51122-M02H
EphA3	Rat	Fc fusion	Sino Biologics	80465-R02H
EphA4	Human	Fc fusion	Sino Biologics	11314-H03H
EphA4	Mouse	Fc fusion	Sino Biologics	50575-M02H
EphA4	Rat	Fc fusion	Sino Biologics	80123-R02H
EphA5	Human	3.1mol biotin/monomer	R&D Systems	3036-A5
EphA6	Human	Fc fusion	R&D Systems	5606-A6
EphA7	Human	Fc fusion	R&D Systems	6756-A7
EphB1	Rat	Fc fusion	R&D Systems	1596-B1
EphB4	Human	Fc fusion	Sino Biologics	10235-H02H

Certain peptide ligands and bicycle drug conjugates were tested in the above mentioned competition binding assay and the results are shown in Tables 13 to 15: Table 13: SPR Binding Analysis with Selected Bicyclic Peptides and Bicycle Drug Conjugates

BCY6026	1.02	1.02E-03	11.3	9.92E+05
BCY6031	1.99	4.95E-03	2.3	2.49E+06
BCY6032	2.10	5.27E-03	2.2	2.52E+06
BCY6033	3.41	3.43E-03	3.5	9.99E+05	21.8	6.37E-03	1.8	2.92E+05	166	4.42E-03	2.6	2.67E+04
BCY6034	1.64	3.65E-03	3.2	2.23E+06
BCY6082	2.42	2.42E-03	4.8	9.87E+05	18.3	5.97E-03	1.9	3.27E+05	28.8	3.64E-03	3.2	1.26E+05
BCY6136	1.17	1.15E-03	10.0	9.86E+05	2.53	1.11E-03	10.4	4.37E+05	2.96	9.11E-04	12.6	3.07E+05
BCY6173	0.73	1.24E-03	9.3	1.69E+06	2.95	1.14E-03	10.1	3.86E+05	1.10	9.60E-04	12.0	8.81E+05

Table 13 details binding affinities and kinetic parameters (Koff and Kon) for binding of selected Bicycle Drug Conjugates to human EphA2 determined using the SPR assay. Table 14: SPR Binding Analysis with Selected Bicycle Drug Conjugates with Human Eph Homologs

BCY6033	no binding @ 5µM	no binding @ 5µM	no binding @ 5µM	no binding @ 25µM	no binding @ 20µM	no binding @ 20µM	no binding @ 20µM
BCY6082	no binding @ 5µM	no binding @ 5µM	no binding @ 5µM	no binding @ 25µM	no binding @ 20µM	no binding @ 20µM	no binding @ 20µM
BCY6136	no binding @ 5µM	no binding @ 5µM	no binding @ 5µM	no binding @ 25µM	no binding @ 20µM	no binding @ 20µM	no binding @ 20µM
BCY6173	no binding @ 5µM	no binding @ 5µM	no binding @ 5µM	no binding @ 25µM	no binding @ 20µM	no binding @ 20µM	no binding @ 20µM

Table 14 illustrates binding results with four Bicycle Drug Conjugates (BCY6033, BCY6082, BCY6136 and BCY6173) in the SPR assay with closely related human Ephrin homologs. The results show that compounds of the invention exhibit no significant binding to closely related human homologs: EphA1, EphA3, EphA4, EphA5, EphA6, EphA7 and EphB4. Table 15: SPR Binding Analysis with Selected Bicycle Drug Conjugates with Mouse and Rat Eph Orthologs

BCY6033	no binding @ 20µM	no binding @ 20µM	no binding @ 20µM	no binding @ 20µM
BCY6082	no binding @ 20µM	no binding @ 20µM	no binding @ 20µM	no binding @ 20µM
BCY6136	no binding @ 20µM	no binding @ 20µM	no binding @ 20µM	no binding @ 20µM
BCY6173	no binding @ 20µM	no binding @ 20µM	no binding @ 20µM	no binding @ 20µM

The results in Table 15 show that certain Bicycle Drug Conjugates (BCY6033, BCY6082, BCY6136 and BCY6173) are also selective for mouse and rat EphA2 and exhibit no significant binding to closely related homologs: mouse EphA3 and EphA4; and rat EphA3 and EphB1.

Studies 3 and 7-23

In each of Studies 3 and 7-23, the following methodology was adopted for each study:

(a) Materials (i) Animals and Housing Condition Animals

• Species: Mus Musculus
• Strain: Balb/c nude or CB17-SCID
• Age: 6-8 weeks
• Body weight: 18-22 g
• Number of animals: 9-90 mice
• Animal supplier: Shanghai Lingchang Biotechnology Experimental Animal Co. Limited

Housing condition

The mice were kept in individual ventilation cages at constant temperature and humidity with 3-5 animals in each cage.

• Temperature: 20~26 °C.
• Humidity 40-70%.

• Cages: Made of polycarbonate. The size is 300 mm x 180 mm x 150 mm. The bedding material is corn cob, which is changed twice per week.
• Diet: Animals had free access to irradiation sterilized dry granule food during the entire study period.
• Water: Animals had free access to sterile drinking water.
• Cage identification: The identification labels for each cage contained the following information: number of animals, sex, strain, the date received, treatment, study number, group number and the starting date of the treatment.
• Animal identification: Animals were marked by ear coding.

(ii) Test and Postitive Control Articles

BCY6031	Lyophilised powder	3878.92	97.99%	Stored at -80°C
BCY6033	Lyophilised powder	4260.01	99.12%	Stored at -80°C
BCY6082	Lyophilised powder	3911.04	96.8%	Stored at -80°C
BCY6135	Lyophilised powder	4021	95.14%	Stored at -80°C
BCY6136	Lyophilised powder	4402.23	97.5-98.6%	Stored at -80°C
BCY6173	Lyophilised powder	4101.15	95.80%	Stored at -80°C
BCY6174	Lyophilised powder	4537	99.50%	Stored at -80°C
BCY6175	Lyophilised powder	4492.29	96.20%	Stored at -80°C
BCY8245	Lyophilised powder	4173.85	99.30%	Stored at -80°C
BCY8781	Lyophilised powder	4173.83	99.00%	Stored at -80°C
Solution (10.47 mg/ml concentration)	-	> 99.00%	Stored at -80°C

(b) Experimental Methods and Procedures (i) Observations

All the procedures related to animal handling, care and the treatment in the study were performed according to the guidelines approved by the Institutional Animal Care and Use Committee (IACUC) of WuXi AppTec, following the guidance of the Association for Assessment and Accreditation of Laboratory Animal Care (AAALAC). At the time of routine monitoring, the animals were daily checked for any effects of tumor growth and treatments on normal behavior such as mobility, food and water consumption (by looking only), body weight gain/loss, eye/hair matting and any other abnormal effect as stated in the protocol. Death and observed clinical signs were recorded on the basis of the numbers of animals within each subset.

(ii) Tumor Measurements and the Endpoints

The major endpoint was to see if the tumor growth could be delayed or mice could be cured. Tumor volume was measured three times weekly in two dimensions using a caliper, and the volume was expressed in mm³ using the formula: V = 0.5 a x b² where a and b are the long and short diameters of the tumor, respectively. The tumor size was then used for calculations of T/C value. The T/C value (in percent) is an indication of antitumor effectiveness; T and C are the mean volumes of the treated and control groups, respectively, on a given day.

TGI was calculated for each group using the formula: TGI (%) = [1-(T_i-T₀)/ (V_i-V₀)] ×100; T_i is the average tumor volume of a treatment group on a given day, T₀ is the average tumor volume of the treatment group on the day of treatment start, V_i is the average tumor volume of the vehicle control group on the same day with T_i, and V₀ is the average tumor volume of the vehicle group on the day of treatment start.

(iii) Sample Collection

At the end of study the tumors of all groups were collected for FFPE.

(iv) Statistical Analysis

Summary statistics, including mean and the standard error of the mean (SEM), are provided for the tumor volume of each group at each time point.

Statistical analysis of difference in tumor volume among the groups was conducted on the data obtained at the best therapeutic time point after the final dose.

A one-way ANOVA was performed to compare tumor volume among groups, and when a significant F-statistics (a ratio of treatment variance to the error variance) was obtained, comparisons between groups were carried out with Games-Howell test. All data were analyzed using GraphPad Prism 5.0. P < 0.05 was considered to be statistically significant.

Reference Study 3: In vivo efficacy in the LU-01-0046 PDX model

Cancer cell lines (CCL) are originally derived from patient tumors, but acquire the ability to proliferate within in vitro cell cultures. As a result of in vitro manipulation, CCL that have been traditionally used in cancer research undergo genetic transformations that are not restored when cells are allowed to grow in vivo. Because of the cell culturing process cells that are better adapted to survive in culture are selected, tumor resident cells and proteins that interact with cancer cells are eliminated, and the culture becomes phenotypically homogeneous. Researchers are beginning to attribute the reason that only 5% of anti-cancer agents are approved by the Food and Drug Administration after pre-clinical testing to the lack of tumor heterogeneity and the absence of the human stromal microenvironment. Specifically, CCL-xenografts often are not predictive of the drug response in the primary tumors because CCL do not follow pathways of drug resistance or the effects of the microenvironment on drug response found in human primary tumors. To overcome these problems, the inventors have used PDX models to improve the predictive power of pre-clinical models.

PDX are created when cancerous tissue from a patient's primary tumor is implanted directly into an immunodeficient mouse. PDX can maintain patient histology, including the presence of non-tumor cells (eg stromal cells) and thus better mimic the tumor microenvironment. In general PDX are therefore more reflective of the heterogeneity and histology of primary tumors than CCL-xenografts.

BCY6031 was screened in a primary adenocarcinoma PDX xenograft (LU-01-0046) derived from a patient with non-small cell lung carcinomas (NSCLC). LU-01-0046 has been shown to express high levels of EphA2 using RNA sequencing. BCY6031 exhibited excellent efficacy in the LU-01-0046 model and is therefore a promising novel therapy for the treatment of non-small cell lung cancer.

(a) Treatment Arms

The experiment was designed to compare tumour growth in vehicle treated animals and animals treated with BCY6031 at 5 mg/kg qw for four weeks. Table 16

1	6	Vehicle	-	10	i.v.	biw*1week
2	3	BCY6031	5	10	i.v.	qw*4weeks

Table 16

Note: n: animal number; Dosing volume: adjust dosing volume based on body weight.

(b) Experimental Method (i) PDX information

Table 17

LU-01-0046	NSCL C	6.790	31.312	High

(ii) Tumor Inoculation

Each mouse was inoculated subcutaneously in the right flank with an approximately 30 mm³ LU-01-0046 tumor fragment. Drug treatment was started when the average tumor volume reached 943 mm³. The test article, route of administration, dosing frequency and the animal numbers in each group are described above.

(iii) Testing Article Formulation Preparation

Table 18

Vehicle	--	50 mM Acetate, 10% Sucrose pH5 (without DMSO)
BCY6031	5	Dissolve 4.59 mg BCY6031 into 4.498 ml formulation buffer to get the 1 mg/ml BCY6031 stock solution; Dilute 450ul 1 mg/ml BCY6031 with 450 µl formulation buffer.

(c) Results (i) Mortality, Morbidity, and Body Weight Gain or Loss

Animal body weight was monitored regularly as an indirect measure of toxicity. Body weight change in female Balb/C nude mice bearing LU-01-0046 tumor dosed with BCY6031 is shown in Figure 1.

(ii) Tumor Growth Curve

The tumor growth curve is shown in Figure 2.

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCY6031 in the PDX model LU-01-0046 was calculated based on tumor volume measurements on day 7 after the start of treatment. Table 19: Tumor growth inhibition analysis (T/C and TGI) on Day 7

2191±473	--	--	--
463±158	21.1	138.6	p<0.05

Table 19: Tumor growth inhibition analysis (T/C and TGI) on Day 7

a. Mean ± SEM. b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Discussion

The study evaluated the therapeutic efficacy of BCY6031 in the LU-01-0046 PDX model. The measured body weights are shown in the Figure 1. Tumor volumes of the treatment group at various time points are shown in Table 19 and Figure 2.

The mean tumor size of vehicle treated mice reached 2191 mm³ on day 7. BCY6031 at 5 mg/kg produced potent antitumor activity with tumor measured as 463 mm³ (TGI=138.6%, p<0.05) by day 7. Furthermore, the BCY6031 treatment completely eradicated the tumors from day 32 and no tumour regrowth occurred following dosing suspension on day 28. BCY6031 gave rise to no significant body weight loss (Figure 1) and there were no adverse clinical observations on drug treated mice throughout the study.

Study 4: In vivo efficacy of BCY6136 in CDX xenograft models

The study evaluated the therapeutic efficacy of BCY6136 in three Cancer Cell Line Derived (CDX) models: the HT1080 fibrosarcoma line, the MDA-MB-231 triple negative breast cancer line and the NCI-H1975 non-small cell lung cancer (NSCLC) line.

(a) Experimental method

Balb/c mice were inoculated subcutaneously with tumour cells at the right flank and drug treatment started when the average the average tumour volume reached between 150 and 200 mm³. Tumour measurements and statistical analysis were performed as described above. Tumour bearing animals were treated once weekly with BCY6136 or vehicle.

(b) Discussion

Figures 4-6 show that BCY6136 is effective in breast, lung and fibrosarcoma xenograft models following once weekly dosing.

The HT1080 fibrosarcoma model:

In the HT1080 model complete regression of tumour growth was achieved by day 14 following once weekly dosing with BCY6136 on days 0 and 7 at 3 and 5 mg/kg (Figure 4). Once weekly dosing with BCY6136 at 2 mg/kg on days 0 and 7 gave rise to tumour stasis (partial regression) (Figure 4). BCY6136 treatment gave rise to no significant body weight loss (Figure 4 inset) and there were no adverse clinical observations on drug treated mice throughout the study.

The NCI-H1975 NSCLC model:

Complete regression of tumour growth in the NCI-H1975 model was observed by around day 28 following 2 and 3 mg/kg once weekly dosing with BCY6136 (Figure 5). Following dosing cessation on day 35 no tumour regrowth was observed in the 3 mg/kg treated animals from day 35 to day 72 when the 3 mg/kg arm measurements ended (Figure 5). Dosing with BCY6136 at 2 mg/kg gave rise to complete regression in this model from around day 28. Following dosing cessation on day 35 there was no tumour regrowth until around day 51 at the 2 mg/kg dose. At this dose level moderate tumour re-growth was observed from around day 51 until study termination on day 77. 1 mg/kg treatment with BCY6136 gave rise to tumour stasis (partial regression) (Figure 5). BCY6136 treatment gave rise to no significant body weight loss (Figure 5 inset) and there were no adverse clinical observations on drug treated mice throughout the study.

The MDA-MB-231 breast model:

Tumour stasis (partial regression) was observed in the MDA-MB231 model following once weekly dosing at 2 and 3 mg/kg from days 0 to day 45 (Figure 6). Some body weight loss (attributed to tumour burden) was observed in the 2 mg/kg treated animals (Figure 6 inset).

These results demonstrate that BCY6136 gives rise to profound tumour growth inhibition in mice implanted with fibrosarcoma, breast and lung CDX xenografts following once daily dosing.

Study 5: Safety studies in the rat

Six (6) female rats were randomly assigned to 3 groups of 2 rats/group to determine the toxicity of BCY6136, following administered by IV bolus injection at 5, 7.5 and 10 mg/kg on days 1 and 8. The study was terminated on day 15.

No significant effects on coagulation parameters (Prothrombin time (sec), Activated partial thromboplastin time (sec) or Fibroginogen levels (g/L) were observed on days 2, 12 and 15 (data not shown). No in-life bleeding events were reported and no evidence of internal bleeding was detected following pathology examination.

Study 6: Safety studies in the cynomologous monkeys

Twenty eight day toxicology studies with BCY6136 we conducted in cynomologous monkeys. BCY6136 was dosed at 1.0 and 2.0 mg/kg on days 1, 8, 15 and 22. Animals were euthanised and necropsied on day 29 (7 days after the final dose).

No significant effects on coagulation parameters relative to baseline were observed on days 18, 22 and 25 (data not shown) and day 29 (Table 20). No in-life bleeding events were reported and no evidence of internal bleeding was detected following pathology examination. Table 20: Day 29 coagulation parameters following 1.0 and 2.0 mg/kg BCY6136 dosing to cynomolgus monkeys

1.0 mg/kg x 4		2.0 mg/kg x 4
Baseline	Day 29	Baseline	Day 29
PT(s)	13.4	11.7	9.4	9.7
PT(s)	11	9.2	11.2	11.0
APTT(s)	18.9	19.4	19.4	20.9
APTT(s)	16.1	15.7	18.7	18.2
FIB(g/L)	2.08	2.42	1.86	6.1
FIB(g/L)	2.28	2.35	1.82	3.1

Study 7: In vivo efficacy study of BCY6033 and BCY6136 and ADC in treatment of PC-3 xenograft in Balb/c nude mice (a) Study Objective

The objective of the research is to evaluate the in vivo anti-tumor efficacy of BCY6033 and BCY6136 in treatment of PC-3 xenograft.

(b) Experimental Design

1	Vehicle	3	-	10	qw
2	BCY6136	3	1	10	qw
3	BCY6136	3	2	10	qw
4	BCY6136	3	3	10	qw
5	ADC	3	3	10	qw
6	BCY6033	3	3	10	qw

(c) Experimental Methods and Procedures (i) Cell Culture

The PC-3 tumor cells will be maintained in F12K medium supplemented with 10% heat inactivated fetal bovine serum at 37°C in an atmosphere of 5% CO₂ in air. The tumor cells will be routinely subcultured twice weekly. The cells growing in an exponential growth phase will be harvested and counted for tumor inoculation.

(ii) Tumor Inoculation

Each mouse will be inoculated subcutaneously at the right flank with PC-3 (10*10⁶) tumor cells for tumor development. The animals will be randomized and treatment will be started when the average tumor volume reaches approximately 150 mm³. The test article administration and the animal numbers in each group are shown in the following experimental design table.

(iii) Testing Article Formulation Preparation

Vehicle	-	50 mM Acetate/acetic acid pH 5 10%sucrose
BCY6136	0.1	Dilute 90 µl 1 mg/ml BCY6136 stock with 810 µl vehicle buffer
	0.2	Dilute 180 µl 1 mg/ml BCY6136 stock with 720 µl vehicle buffer
	0.3	Dilute 270 µl 1 mg/ml BCY6136 stock with 630 µl vehicle buffer
ADC	0.3	Dilute 26 µl 10.47 mg/ml ADC stock with 874 µl ADC buffer
BCY6033	0.3	Dilute 270 µl 1 mg/ml BCY6033 stock with 630 µl vehicle buffer

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve are shown in Figures 7 to 9.

(ii) Tumor Volume Trace

Mean tumor volume over time in female Balb/c nude mice bearing PC-3 xenograft is shown in Table 21. Table 21: Tumor volume trace over time

149±9	235±9	377±9	718±30	1126±41	1431±79	1792±69	2070±152
150±11	185±25	228±31	201±17	183±23	153±38	137±33	107±32	64±28	45±23
149±18	179±28	158±22	137±16	122±15	114±20	101±16	79±20	57±19	42±17
149±2	155±8	144±16	132±20	107±28	94±23	83±22	70±27	38±16	35±17
151±27	203±10	210±12	189±11	185±16	190±37	158±36	124±35	103±27	74±14
151±33	214±53	204±51	192±53	163±43	151±40	141±39	116±36	83±28	63±32

Table 21: Tumor volume trace over time

35±18	28±14	37±19	34±17	42±21	42±23	43±21	28±14	18±9
21±11	22±12	22±12	24±12	33±16	22±11	26±14	22±12	16±9
21±10	23±12	27±14	22±11	24±12	20±11	27±14	12±6	12±6
53±16	50±22	46±23	70±35	78±39	53±27	60±30	53±27	40±22
59±31	44±27	39±24	40±29	47±32	41±27	41±30	34±24	33±27

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for test articles in the PC-3 xenograft model was calculated based on tumor volume measurements at day 16 after the start of treatment. Table 22: Tumor growth inhibition analysis

Vehicle, qw	2070±152	--	--	--
BCY6136, 1mpk, qw	107±32	5.2	102.2	p<0.001
BCY6136, 2 mpk, qw	79±20	3.8	103.6	p<0.001
BCY6136, 3 mpk, qw	70±27	3.4	104.1	p<0.001
ADC, 3 mpk, qw	124±35	6.0	101.4	p<0.001
116±36	5.6	101.8	p<0.001

Table 22: Tumor growth inhibition analysis

a. Mean ± SEM. b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of test articles in the PC-3 xenograft model was evaluated. The measured body weights and tumor volumes of all treatment groups at various time points are shown in the Figures 7 to 9 and Tables 21 and 22.

The mean tumor size of vehicle treated mice reached 2070 mm³ on day 16. BCY6136 at 1 mg/kg, qw (TV=107 mm³, TGI=102.2%, p<0.001), BCY6136 at 2 mg/kg, qw (TV=79 mm³, TGI=103.6%, p<0.001) and BCY6136 at 3 mg/kg, qw (TV=70 mm³, TGI=104.1 %, p<0.001) showed potent anti-tumor effect.

BCY6033 at 3 mg/kg, qw (TV=116 mm³, TGI=101.8%, p<0.001) and ADC at 3 mg/kg, qw (TV=124 mm³, TGI=101.4%, p<0.001) showed comparable anti-tumor effect.

In this study, animal body weight was monitored regularly. All mice maintained their body weight well.

Study 8. In vivo efficacy study of BCY6136 in treatment of PC-3 xenograft in Balb/c nude mice (a) Study Objective

The objective of the research is to evaluate the in vivo anti-tumor efficacy of BCY6136 in treatment of PC-3 xenograft in Balb/c nude mice.

(b) Experimental Design

1	Vehicle	--	4	i.v.	qw x4 weeks
2	BCY6136	0.167	4	i.v.	qw x4 weeks
BCY6136	0.5	4	i.v.	qw x4 weeks
4	BCY6136	1.5	4	i.v.	qw x4 weeks
BCY6136	0.5	4	i.v.	q2w x2 weeks
BCY6136	1.5	4	i.v.	q2w x2 weeks
7	EphA2-ADC	0.33	4	i.v.	qw x4 weeks
8	EphA2-ADC	1	4	i.v.	qw x4 weeks
9	EphA2-ADC	3	4	i.v.	qw x4 weeks
Docetaxel	15	4	i.v.	qw x4 weeks

a. N, the number of animals in each group. b. After 4 weeks' treatment demonstrated in the experimental design table, the mice of group 3, 5 and 6 were treated with BCY6136 1.5 mg/kg qw from day 52 during the monitoring schedule. c. Due to the severe body weight loss of the Docetaxel treated mice after the first dosing, the treatment was suspended for 2 weeks, then a lower dosage (Docetaxel, 10 mg/kg) was performed on day 28. After that, the mice were treated with BCY6136 1.5 mg/kg qw from day 42 to day 70.

(c) Experimental Methods and Procedures (i) Cell Culture

The tumor cells were maintained in F-12K medium supplemented with 10% heat inactivated fetal bovine serum at 37°C in an atmosphere of 5% CO₂ in air. The tumor cells were routinely subcultured twice weekly. The cells growing in an exponential growth phase were harvested and counted for tumor inoculation.

(ii) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with PC-3 tumor cells (10 x 10⁶) in 0.2 ml of PBS for tumor development. 52 animals were randomized when the average tumor volume reached 454 mm³. The test article administration and the animal numbers in each group were shown in the experimental design table.

(iii) Testing Article Formulation Preparation

Vehicle	-	-	25 mM Histidine pH 7 10%sucrose
BCY6136	98.6%	-	50 mM Acetate 10% sucrose pH 5
		1	Dissolve 2.70 mg BCY6136 in 2.662 ml Acetate buffer
		0.3
		0.15	Dilute 600 µl 0.3 mg/ml BCY6136 stock with 600 µl Acetate buffer
		0.05	Dilute 200 µl 0.3 mg/ml BCY6136 stock with 1000 µl Acetate buffer
		0.0167	Dilute 66.7 µl 0.3 mg/ml BCY6136 stock with 1133.3 µl Acetate buffer
EphA2-ADC	-	-	25 mM Histidine pH 5.5
		0.033	Dilute 9.3 µl 4.24 mg/ml EphA2-ADC stock with 1191 µl His buffer
		0.1	Dilute 28 µl 4.24 mg/ml EphA2-ADC stock with 1172 µl His buffer
		0.3	Dilute 84.9 µl 4.24 mg/ml EphA2-ADC stock with 1115 µl His buffer
Docetaxel	-	10	Mix 0.5 ml 20mg Docetaxel with 1.5 ml buffer
		1.5	Dilute 180 µl 10 mg/ml Docetaxel stock with 1020 µl saline buffer

(c) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve is shown in Figure 10.

(ii) Tumor Volume Trace

Mean tumor volume over time in male Balb/c nude mice bearing PC-3 xenograft is shown in Table 23. Table 23: Tumor volume trace over time (Day 0 to day 20)

		456± 25	648± 50	880 ±23	1022±2 9	1178±1 18	1327±1 33	1631±9 3	1868±9 0	2052±1 39	2364±1 02
		450± 33	631± 55	695 ±78	739 ±39	850 ±68	904 ±73	975 ±47	1089±7 4	1124±9 2	1188±1 11
		451± 47	622± 96	519 ±70	460 ±55	398 ±50	329 ±38	260 ±33	249 ±33	231 ±38	234 ±42
		458± 49	587± 63	494 ±54	363 ±32	283 ±32	237 ±24	192 ±13	164 ±16	155 ±20	131 ±19
		454± 37	643± 25	531 ±37	458 ±33	411 ±32	382 ±49	430 ±88	522 ±124	560 ±129	530 ±147
		452± 42	590± 75	457 ±49	375 ±44	328 ±47	242 ±63	206 ±61	197 ±62	182 ±55	128 ±36
		457± 43	636± 57	712 ±70	792 ±78	870 ±87	900 ±58	1049±6 6	1242±1 23	1443±1 29	1637±1 81
		450± 49	617± 48	673 ±50	721 ±61	782 ±78	755 ±67	840 ±93	913 ±91	978 ±100	981 ±100
				643	593	433	290	268	232	225	184
		452± 60	593± 98	±141	±106	±103	±81	±64	±60	±66	±62
		453± 62	584± 72	632 ±56	636 ±48	568 ±50	408 ±31	374 ±26	388 ±36	361 ±25	419 ±31

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for test articles in the PC-3 xenograft model was calculated based on tumor volume measurements at day 20 after the start of the treatment. Table 24: Tumor growth inhibition analysis

2364±102	--	--	--
1188±111	50.2	61.4
234±42	9.9	111.4
131±19	5.5	117.2
530±147	22.4	96.0
128±36	5.4	117.0
1637±181	69.2	38.1
981±100	41.5	72.2
184±62	7.8	114.0
419±31	17.7	101.8

Table 24: Tumor growth inhibition analysis

a. Mean ± SEM. b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(d) Results Summary and Discussion

In this study, the therapeutic efficacy of test articles in the PC-3 xenograft model was evaluated. The measured body weights and tumor volumes of all treatment groups at various time points are shown in the Figure 10 and Tables 23 and 24.

The mean tumor size of vehicle treated mice reached 2364 mm³ on day 20. BCY6136 at 0.167 mg/kg, qw (TV=1188 mm³, TGI=61.4%, p<0.001), 0.5 mg/kg, q2w (TV=530 mm³, TGI=96.0%, p<0.001), 0.5 mg/kg, qw (TV=234 mm³, TGI=111.4%, p<0.001) and 1.5 mg/kg, qw (TV=131 mm³, TGI=117.2%, p<0.001) produced significant anti-tumor activity in dose or dose-frequency dependent manner on day 20. BCY6136 at 1.5 mg/kg, q2w (TV=128 mm³, TGI=117.0%, p<0.001) produced comparable anti-tumor activity with BCY6136 1.5 mg/kg qw. Among them, the mice treated with BCY6136, 0.5 mg/kg qw or BCY6136, 0.5 mg/kg q2w showed obvious tumor relapse after ceasing the treatment, further treatment with BCY6136, 1.5 mg/kg qw from day 52 worked well on the tumor regression. The mice treated with BCY6136, 1.5 mg/kg q2w also showed tumor relapse after ceasing the treatment, but further dosing didn't work on complete tumor regression. The mice treated with BCY6136, 1.5 mpk qw didn't show any tumor relapse until day 48.

EphA2-ADC at 0.33 mg/kg, qw (TV=1637 mm³, TGI=38.1%, p<0.001), 1 mg/kg, qw (TV=981 mm³, TGI=72.2%, p<0.001) and 3 mg/kg, qw (TV=184 mm³, TGI=114.0%, p<0.001) produced significant anti-tumor activity in dose dependent manner on day 20. The mice treated with EphA2-ADC, 3 mg/kg qw didn't show any tumor relapse until day 59.

Docetaxel at 15 mg/kg, qw (TV=419 mm³, TGI=101.8%, p<0.001) produced significant anti-tumor activity but caused severe animal body weight loss. After ceasing the treatment, the mice showed obvious tumor relapse. The treatment with BCY6136, 1.5 mg/kg qw from day 42 worked well on tumor regression of these mice.

Study 9. In vivo efficacy test of BCY6033, BCY6136 and BCY6082 in treatment of NCI-H1975 xenograft in Balb/c nude mice (a) Study Objective

The objective of the research was to evaluate the in vivo anti-tumor efficacy of BCY6033, BCY6136 and BCY6082 in treatment of NCI-H1975 xenograft model in Balb/c nude mice.

(b) Experimental Design

1	Vehicle	3	--s	10	qw
2	BCY6033	3	1	10	qw
3	BCY6033	3	2	10	qw
4	BCY6033	3	3	10	qw
5	BCY6136	3	1	10	qw
6	BCY6136	3	2	10	qw
7	BCY6136	3	3	10	qw
8	BCY6082	3	2	10	qw
9	BCY6082	3	5	10	qw

(c) Experimental Methods and Procedures (i) Cell Culture

The cells growing in an exponential growth phase were harvested and counted for tumor inoculation.

(ii) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with NCI-H1975 tumor cells (10× 10^6) in 0.2ml of PBS for tumor development. 36 animals were randomized when the average tumor volume reached 149 mm³. The test article administration and the animal numbers in each group were shown in the experimental design table.

(iii) Testing Article Formulation Preparation

Vehicle		50 mM Acetate, 10% sucrose pH=5
BCY6033	1	Dissolve 6.71 mg BCY6033 in 6.710 ml formulation buffer
	0.3	Dilute 270 µl 1 mg/ml BCY6033 with 630 µl formulation buffer
	0.2	Dilute 180 µl 1 mg/ml BCY6033 with 720 µl formulation buffer
	0.1	Dilute 90 µl 1 mg/ml BCY6033 with 810 µl formulation buffer
BCY6136	1	Dissolve 3.79 mg BCY6136 in 3.695ml formulation buffer
	0.3	Dilute 270 µl 1 mg/ml BCY6136 with 630 µl formulation buffer
	0.2	Dilute 180 µl 1 mg/ml BCY6136 with 720 µl formulation buffer
	0.1	Dilute 90 µl 1 mg/ml BCY6136 with 810 µl formulation buffer
BCY6082	1	Weigh and dissolve 4.30 mg BCY6082 in 4.162 ml formulation buffer
	0.5	Dilute 450 µl 1 mg/ml BCY6082 with 450 µl formulation buffer
	0.2	Dilute 180 µl 1 mg/ml BCY6082 with 720 µl formulation buffer

(iv) Sample Collection

On PG-D23, we fixed the tumors of Group 1 for FFPE.

On PG-D44, we fixed the tumors of Group 2 and 5 for FFPE.

At the end of study, we the tumors of Group 6 for FFPE.

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth are shown in Figures 11 to 13.

(ii) Tumor Volume Trace

Mean tumor volume over time in female Balb/c nude mice bearing NCI-H1975 xenograft is shown in Table 25 to 29. Table 25: Tumor volume trace (PG-D0~PG-D17)

		148 ±4	195±1 1	297±3 3	466±6 4	732±1 07	1028±1 92	1278±2 52	1543±2 98
		149 ±10	160±4	207±1 3	259±4 9	330±6 9	365±83	341±59	336±54
		149 ±10	183±1 1	276±2 4	365±4 2	405±2 0	364±19	319±32	304±33
		149 ±6	161±4	207±2 6	260±2 1	270±4 2	243±52	187±53	131±43
		150 ±6	178±2 0	232±4 9	336±4 3	400±2 4	407±42	299±11 3	261±12 7
		150 ±14	181±2 6	237±2 7	277±3 6	297±3 7	306±55	256±53	218±49
		148 ±9	168±1 0	231±6	365±1 6	390±1 3	423±42	319±26	228±16
		148 ±5	157±4	223±1 9	370±8 4	447±1 02	658±18 8	906±33 2	1123±4 10
		148 ±6	176±1 2	235±1 9	378±5 9	436±6 8	510±82	484±78	491±10 3

Table 26: Tumor volume trace (PG-D18~PG-D35)

		186 4±3 95	2371± 470	--	--	--	--	--	--
		278 ±71	306±8 1	343±8 6	366±8 9	466±1 15	481±1 12	619±1 70	780±2 36
		172 ±25	95±12	61±6	39±4	13±1	12±1	6±3	6±3
		75± 15	29±4	20±6	13±2	6±0	4±0	1±0	2±1
		215 ±11 3	205±1 17	197±1 13	200±1 05	202±1 12	202±1 17	230±1 42	241±1 27
		149 ±31	99±30	69±22	42±13	30±10	16±8	20±9	4±2
		149 ±17	94±30	50±15	41±21	21±8	6±6	10±6	3±1
		119 9±4 08	1528± 604	1978± 792	2499± 931	--	--	--	--
		471 ±14 3	390±1 33	368±1 22	295±1 02	227±8 6	--	--	--

Table 27: Tumor volume trace (PG-D37~PG-D53)

		877±188	945±145	1258±173	--	--	--	--	--
		3±1	1±0	1±0	1±0	1±0	1±0	1±0	1±0
		0±0	0±0	0±0	0±0	1±0	0±0	1±0	1±0
		277±149	294±159	351±188	--	--	--	--	--
		7±4	2±1	1±0	3±1	2±1	3±2	6±3	14±10
		3±3	2±1	1±0	0±0	0±0	0±0	1±0	1±0

Table 28: Tumor volume trace (PG-D56~PG-D74)

		1±0	1±0	1±0	1±0	1±0	2±1	4±3	7±6	--
		1±0	1±0	0±0	0±0	0±0	0±0	0±0	0±0	--
		16± 11	27±18	34±23	45±31	63±40	71±47	95±70	111±7 3	122±7 5
		1±0	1±0	1±0	0±0	0±0	0±0	0±0	0±0	--

Table 29: Tumor volume trace (PG-D77~PG-D98)

		208±112	337±123	501±172	626±182	856±245	1035±169	1266±39

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCY6033, BCY6136 and BCY6082 in the NCI-H1975 xenograft model was calculated based on tumor volume measurements at day 21 after the start of treatment. Table 30: Tumor growth inhibition analysis

2371±470	--	--	--
306±81	12.9	92.9	p<0.001
95±12	4.0	102.5	p<0.001
29±4	1.2	105.4	p<0.001
205±117	8.6	97.5	p<0.001
99±30	4.2	102.3	p<0.001
94±30	4.0	102.4	p<0.001
1528±604	64.4	37.9	p>0.05
390±133	16.4	89.1

Table 30: Tumor growth inhibition analysis

a. Mean ± SEM. b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of BCY6033, BCY6136 and BCY6082 in the NCI-H1975 xenograft model was evaluated. The measured body weights and tumor volumes of all treatment groups at various time points are shown in the Figures 11 to 13 and Tables 25 to 30.

The mean tumor size of vehicle treated mice reached 2371 mm³ on day 21. BCY6033 at 1 mg/kg (TV=306 mm³, TGI=92.9%, p<0.001), 2 mg/kg (TV=95 mm³, TGI=102.5%, p<0.001) and 3 mg/kg (TV=29 mm³, TGI=105.4%, p<0.001) produced dose-dependent antitumor activity. BCY6033 at 2 mg/kg and 3 mg/kg eradicated the tumors or regressed the tumor to small size, the treatments was suspended from day 35, and the tumors didn't show obvious re-growth in following 5-6 weeks monitoring.

BCY6136 at 1 mg/kg (TV=205 mm³, TGI=97.5%, p<0.001), 2 mg/kg (TV=99 mm³, TGI=102.3%, p<0.001) and 3 mg/kg (TV=94 mm³, TGI=102.4%, p<0.001) produced potent antitumor activity. BCY6136 at 2 mg/kg and 3 mg/kg eradicated the tumors or regressed the tumor to small size. The treatments was suspended from day 35, and the tumors in 3 mg/kg group didn't show obvious re-growth in following 5-6 weeks monitoring, however tumors in 2 mg/kg group showed obvious regrowth and didn't show significant tumor inhibition when resuming the dosing.

BCY6082 at 2 mg/kg (TV=1528 mm3, TGI=37.9%, p>0.05) didn't show obvious antitumor activity, BCY6082 at 5 mg/kg (TV=390 mm3, TGI=89.1%, p<0.001) produced significant antitumor activity.

In this study, one mouse treated with BCY6033 3mg/kg lost over 15% bodyweight during the monitoring, other mice maintained the bodyweight well.

Study 10. In vivo efficacy study of BCY6136 in the LU-01-0251 PDX model in Balb/c nude mice (a) Study Objective

The objective of the research is to evaluate the in vivo anti-tumor efficacy of BCY6136 in the LU-01-0251 PDX model in Balb/c nude mice.

(b) Experimental Design

1	Vehicle	5	--	10	iv	qw
2	BCY6136	5	1	10	iv	qw
3	BCY6136	5	2	10	iv	qw
4	BCY6136	5	3	10	iv	qw
5	ADC	5	3	10	iv	qw

(c) Experimental Methods and Procedures (i) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with LU-01-0251 of tumor fragment (~30 mm³) for tumor development. The treatment was started when the average tumor volume reached 174 mm³ for efficacy study. The test article administration and the animal number in each group are shown in the experimental design table.

(ii) Testing Article Formulation Preparation

Vehicle	--	50 mM Acetate 10% sucrose pH 5
BCY6136	0.3
	0.2	Dilute 940 µl 0.3 mg/ml BCY6136 stock with 470 µl Acetate buffer
	0.1	Dilute 470 µl 0.3 mg/ml BCY6136 stock with 940 µl Acetate buffer
ADC	0.3

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve are shown in Figure 14.

(ii) Tumor Volume Trace

Mean tumor volume on day 28 after the start of treatment in female Balb/c nude mice bearing LU-01-0251 xenograft is shown in Table 31. Table 31: Tumor volume trace over time

0	174±17	175±15	174±17	175±14	174±16
3	264±33	230±29	205±21	187±19	227±12
7	403±68	281±55	154±21	118±13	239±42
10	562±83	370±104	111±19	72±12	241±46
14	777±163	362±104	62±17	30±5	191±47
17	1021±246	437±136	46±13	17±3	139±39
21	1472±342	526±167	30±18	4±3	101±31
24	1790±417	491±132	32±24	1±1	70±23
28	2208±512	499±128	32±30	0±0	39±14

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCY6136 and ADC in the LU-01-0251 PDX model was calculated based on tumor volume measurements at day 28 after the start of the treatment. Table 32: Tumor growth inhibition analysis

2208±512	--	--	--
499±128	22.6	84.0
32±30	1.4	107.0
0±0	0.0	108.6
39±14	1.8	106.6

Table 32: Tumor growth inhibition analysis

a. Mean ± SEM; b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of BCY6136 and ADC in LU-01-0251 PDX model was evaluated. The measured body weight and tumor volume of all treatment groups at various time points are shown in the Figure 14 and Tables 31 and 32.

In this study, the mean tumor volume of vehicle treated mice reached 2208 mm³ on day 28 after the start of treatment. BCY6136 at 1 mg/kg, qw (TV=499 mm³, TGI=84.0%, p<0.001), 2 mg/kg, qw (TV=32 mm³, TGI=107.0%, p<0.001) and 3 mg/kg, qw (TV=0 mm³, TGI=108.6%, p<0.001) produced dose-dependent anti-tumor activity. ADC at 3 mg/kg, qw (TV=39 mm³, TGI=106.6%, p<0.001) showed significant anti-tumor activity.

Study 11: In vivo efficacy study of BCY6136 in the LU-01-0251 PDX model in Balb/c nude mice (a) Study Objective

The objective of the research is to evaluate the in vivo anti-tumor efficacy of BCY6136 in the LU-01-0251 PDX model in Balb/c nude mice.

(b) Experimental Design

1	Vehicle	5	--	10	iv	Qw*21
2	BCY6136	5	1	10	iv	Qw*28
BCY6136	5	2	10	iv	Qw*70
BCY6136	5	3	10	iv	Qw*56
ADC	5	3	10	iv	Qw*70

a. The dosing schedule was kept from day 0 to day 70 for all the mice of this group, then the mouse 3-2 and mouse 3-4 were further dosed with BCY6136 3 mg/kg qw from day 77 while the treatment of the other 3 mice was suspended. The dosing schedule was kept from day 0 to day 56 for all the mice of this group. b. The dosing schedule was kept from day 0 to day 70 for all the mice of this group.

(c) Experimental Methods and Procedures (i) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with LU-01-0251 of tumor fragment (~30 mm³) for tumor development. The treatment was started when the average tumor volume reached 960 mm³ for efficacy study. The test article administration and the animal number in each group are shown in the experimental design table.

(ii) Testing Article Formulation Preparation

Vehicle	--	25 mM Histidine 10% sucrose pH 7
BCY6136	0.3	0.3 mg/ml BCY6136 was prepared as in Study 10 hereinbefore
	0.2
	0.1	Dilute 470 µl 0.3 mg/ml BCY6136 stock with 940 µl His-buffer
ADC	0.3

(iii) Sample Collection

Tumor of mouse #3-2 was collected for FFPE on Day94. Tumors of mice #5-2 and 5-3 were collected and embed into 1 FFPE block on Day140.

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve are shown in Figure 15.

(ii) Tumor Volume Trace

Mean tumor volume on day 0 to day 28 after the start of treatment in female Balb/c nude mice bearing LU-01-0251 xenograft is shown in Table 33. Table 33: Tumor volume trace over time

0	962±102	963±97	962±137	960±103	959±124
3	1176±108	1003±121	973±105	989±128	1043±158
7	1351±142	1056±151	873±125	890±98	1100±156
10	1591±179	1122±139	722±157	674±96	1172±188
14	1951±225	1417±191	503±151	342±64	1228±174
17	2301±344	1672±262	398±160	216±43	1143±186
21		1794±328	307±169	94±26	996±187
24		1867±408	261±168	62±14	867±178
28		2120±483	217±167	45±16	713±178

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCY6136 and ADC in the LU-01-0251 PDX model was calculated based on tumor volume measurements at day 17 after the start of the treatment. Table 34: Tumor growth inhibition analysis

2301±344	--	--	--
1672±262	72.7	47.0
398±160	17.3	142.1
216±43	9.4	155.6
1143±186	49.7	86.3

Table 34: Tumor growth inhibition analysis

a. Mean ± SEM; b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of BCY6136 and ADC in LU-01-0251 PDX model was evaluated. The measured body weight and tumor volume of all treatment groups at various time points are shown in the Figure 15 and Tables 33 and 34.

In this study, the treatment was started when the average tumor volume reached 960 mm³. On day 17 after the start of treatment, the mean tumor volume of vehicle treated mice reached 2301 mm³. BCY6136 at 1 mg/kg qw (TV=1672 mm³, TGI=47.0%, p>0.05) didn't show obvious antitumor activity; BCY6136 at 2 mg/kg qw (TV=398 mm³, TGI=142.1%, p<0.001) and 3 mg/kg qw (TV=216 mm³, TGI=155.6%, p<0.001) produced dose-dependent anti-tumor activity on day 17.

After 70 days' treatment with BCY6136 at 2 mg/kg qw, 3 in 5 of these mice showed complete tumor regression, the other 2 mice showed obvious tumor relapse from day 42 to day 77. Then further treatment with BCY6136 3 mg/kg qw was performed to the two relapse tumors from day 7, one of tumor showed obvious tumor regress while another one showed resistance to the treatment.

After 56 days' treatment with BCY6136 at 3 mg/kg qw, all the mice of this group showed complete tumor regression.

ADC at 3 mg/kg qw (TV=1143 mm³, TGI=86.3%, p<0.01) showed obvious anti-tumor activity on day 17, after another 53 day' treatment, these mice showed further but not complete tumor regression.

In this study, there were some mice showed sudden bodyweight loss, this may have the relationship with the long term feeding of the immune-deficiency mice.

Study 12: In vivo efficacy study of BCY6033, BCY6136, BCY6082 and BCY6031 in the LU-01-0046 NSCLC PDX model in Balb/c nude mice (a) Study Objective

The objective of the research is to evaluate the in vivo anti-tumor efficacy of BCY6033, BCY6136, BCY6082 and BCY6031 in large LU-01-0046 PDX tumors in Balb/c nude mice.

(b) Experimental Design

1	Vehicle	5	--	10	iv	qw
2	BCY6082	5	1	10	iv	qw
3	BCY6082	5	3	10	iv	qw
4	BCY6033	5	1	10	iv	qw
5	BCY6033	5	3	10	iv	qw
6	BCY6136	5	1	10	iv	qw
7	BCY6136	5	3	10	iv	qw
8	ADC	5	3	10	iv	qw
9	BCY6031	5	3	10	iv	qw

(c) Experimental Methods and Procedures (i) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with LU-01-0046 of tumor fragment (~30 mm³) for tumor development. The treatment was started when the average tumor volume reaches 955 mm³ for BT17BDCs study and 1039 mm³ for BCYs study. The test article administration and the animal numbers in each group are shown in the experimental design table.

(ii) Testing Article Formulation Preparation

Vehicle	-	50 mM Acetate 10% sucrose pH 5
BCY6033	0.1
	0.3	Dilute 450 µl 1 mg/ml BCY6033 stock with 1050 µl Acetate buffer
BCY6136	0.1	Dilute 150 µl 1 mg/ml BCY6136 stock with 1350 µl Acetate buffer
	0.3	Dilute 450 µl 1 mg/ml BCY6136 stock with 1050 µl Acetate buffer
BCY6082	0.1	Dilute 150 µl 1 mg/ml BCY6082 stock with 1350 µl Acetate buffer
	0.3	Dilute 450 µl 1 mg/ml BCY6082 stock with 1050 µl Acetate buffer
BCY6031	0.3	Dissolve 5.72 mg BCY6031 in 5.6 ml Acetate buffer to make 1 mg/ml stock. Dilute 450 µl 1 mg/ml BCY6031 with 1050 µl Acetate buffer
ADC	0.3

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve are shown in Figure 16.

(ii) Tumor Volume Trace

Mean tumor volume over time in female Balb/c nude mice bearing LU-01-0046 is shown in Table 35. Table 35: Tumor volume trace over time (BCYs Section)

		1044±115	1762±178	2404±262	--	--	--	--
		1049±133	1592±178	2279±168	--	--	--	--
		1033±111	1040±124	1294±182	1298±101	1849±189	2052±168	1999±425
		1030±124	1173±227	1791±324	2408±484	--	--	--
		1046±128	555±85	441±144	182±76	163±94	114±54	88±76
		1037±130	1163±146	1927±283	2483±530	--	--	--
		1036±100	784±146	548±107	362±110	325±122	275±152	233±187
		1033±114	1155±230	2200±505	--	--	--	--
		1042±117	820±149	1319±233	901±188	672±198	522±315	515±323

Table 35: Tumor volume trace over time (BCYs Section)

Note: the tumor volume trace didn't show after the day22 for the group3, 5, 7 and 9.

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for test articles in the LU-01-0046 PDX model was calculated based on tumor volume measurements at day 22 and day 28 respectively for the two section studies after the start of the treatment. Table 36: Tumor growth inhibition analysis (BCYs section on day 22)

6186±596*	--	--	--
5805±428*	93.8	7.5
1999±425	32.3	81.2
4384±881 *	70.9	34.8
88±76	1.4	118.6
4564±981*	73.8	31.4
233±187	3.8	115.6
5446±1250*	88.0	14.2
515±323	8.3	110.2

Table 36: Tumor growth inhibition analysis (BCYs section on day 22)

a. Mean ± SEM; b. Tumor Growth Inhibition is calculated by dividing the average tumor volume of the treated group by the average tumor volume of the control group (T/C). *Some groups was terminated before day 22, and the tumor size was calculated by exponential growth equation acquisition as below: Vehicle group: Y = 995.4 × exp (0.1134 × X). BCY6082, 1mpk group: Y = 939.1 × exp (0.1128 × X). BCY6033, 1mpk group: Y = 846.6 × exp (0.0945 × X). BCY6136, 1mpk group: Y = 855.0 × exp (0.0974 × X). ADC, 3mpk group: Y = 757.4× exp (0.1312 × X).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of test articles in large LU-01-0046 tumors was evaluated. The measured body weights and tumor volumes of all treatment groups at various time points are shown in the Figure 16 and Tables 35 and 36.

In BCYs study, the mean tumor size of vehicle treated mice was calculated as 6186 mm³ on day 22. BCY6082, BCY6033, BCY6136 at 1 mg/kg and ADC at 3mg/kg didn't show obvious anti-tumor activity when starting treatment from tumor size of 1000mm³.

BCY6082 (TV=1999 mm³, TGI=81.2%, p<0.01), BCY6033 (TV=88 mm³, TGI=118.6%, p<0.001), BCY6136 (TV=233 mm³, TGI=115.6%, p<0.001) and BCY6031 (TV=115 mm³, TGI=110.2%, p<0.001) at 3 mg/kg produced significant anti-tumor antitumor activity. Among them, BCY6033 and BCY6136 eradicated 2/5 and 4/5 tumors completely.

Study 13: In vivo efficacy of BCY6136 in Balb/c nude mice bearing LU-01-0046 NSCLC PDX model (a) Study Objective

The objective of the research was to evaluate the in vivo therapeutic efficacy of BCY6136 in Balb/c nude mice bearing LU-01-0046 NSCLC PDX model.

(b) Experimental Design

1	Vehicle	5	--	i.v.	qw*2 w
2	BCY6136	5	1	i.v.	qw*3 w
3	BCY6136	5	2	i.v.	qw*4 w
4	BCY6136	5	3	i.v.	qw*4 w
5	ADC	5	3	i.v.	qw*3 w
6	ADC	5	5	i.v.	qw*3 w

(c) Experimental Methods and Procedures (i) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with certain kind of tumor fragment (~30 mm³) for tumor development. The treatments were started when the average tumor volume reached approximately 198 mm³. The test article administration and the animal numbers in each group are shown in the experimental design table.

(ii) Testing Article Formulation Preparation

1	Vehicle	-	-	50 mM Acetate, 10% Sucrose pH 5 (without DMSO)
2	BCY6136	1	0.1	Dissolve 10.93 mg BCY6136 in 10.766 ml vehicle, ultrasonic simply to make the 1 mg/ml BCY6136 stock solution
				Dilute 150 µl 1 mg/ml BCY6136 stock solution with 1350 µl vehicle
3	BCY6136	2	0.2	Dilute 300 µl 1 mg/ml BCY6136 stock solution with 1200 µl vehicle
4	BCY6136	3	0.3	Dilute 450 µl 1 mg/ml BCY6136 stock solution with 1050 µl vehicle
Buffer 2: Dissolve 0.419 g His. hydrochloride in 100 ml water, use 1 M HCl adjust pH to 5.5
5	ADC	3	0.3	Dilute 43 µl 10.47 mg/ml ADC stock solution with 1457 µl with buffer 2
6	ADC	5	0.5	Dilute 71.6 µl 10.47 mg/ml ADC stock solution with1428.4 µl with buffer 2

Note: The dosing formulation frequently is fresh prepared timely.

(iii) Sample Collection

Groups were terminated when average tumor volume reached over 2000 mm³ and tumors were harvested for FFPE after the last measurement: Group 1 on PG-D14, group 5 on PG-D18, group 2 & 6 on PG-D21 and group 3 & 4 on PG-D31.

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve are shown in Figure 17.

(ii) Tumor Volume Trace

Mean tumor volume over time in female Balb/c nude mice bearing LU-01-0046 NSCLC PDX model is shown in Table 37. Table 37: Tumor volume trace over time (mm³)

0	201 ± 37	198 ± 39	201 ± 40	200 ± 46	195 ± 28	195 ± 40
3	441 ± 82	310 ± 59	283 ± 77	155 ± 40	418 ± 99	389 ± 68
7	927 ± 171	547 ± 88	423 ± 132	74 ± 19	643 ± 159	596 ± 116
10	1546 ± 377	747 ± 121	321 ± 108	31 ± 8	938 ± 230	882 ± 134
14	2307 ± 594	1058 ± 140	264 ± 95	26 ± 11	1475 ± 466	1215 ± 193
17	-	1390 ± 205	127 ± 41	26 ± 13	2281 ± 556	1576 ± 228
21	-	2138 ± 301	118 ± 34	64 ± 42	-	2049 ± 242
24	-	-	101 ± 40	99 ± 63	-	-
28	-	-	255 ± 140	276 ± 176	-	-
31	--	-	582 ± 346	477 ± 283	-	-

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for test articles in Balb/c nude mice bearing LU-01-0046 PDX model was calculated based on tumor volume measured on PG-D14. Table 38: Tumor growth inhibition analysis

2307 ± 594	--	--	--
1058 ± 140	45.9	59.1	p<0.05
264 ± 95	11.4	97.0	p<0.001
26 ± 11	1.1	108.3	p<0.001
1475 ± 466	63.9	39.2	p>0.05
1215 ± 193	52.7	51.6

Table 38: Tumor growth inhibition analysis

(e) Results Summary and Discussion

In the present study, the therapeutic efficacy of test articles in the LU-01-0046 PDX model was evaluated. The measured body weights and tumor volumes of all treatment groups at various time points were shown in the Figure 17 and Tables 37 and 38.

The mean tumor size of vehicle treated mice reached 2307 mm³ on PG-D14. BCY6136 at 1 mg/kg (TV=1058 mm³, TGI=59.1%, p<0.05), at 2 mg/kg (TV=264 mm³, TGI=97.0%, p<0.001) and at 3 mg/kg (TV=26 mm³, TGI=108.3%, p<0.001) produced dose-dependent antitumor activity. ADC at 3 mg/kg and 5 mg/kg did not show obvious antitumor activity (p>0.05).

In this study, all of the group's animals maintained the body weight well.

Study 14: In vivo efficacy study of BCY6033, BCY6136, BCY6082, BCY6173, BCY6175 and BCY6031 in the LU-01-0046 NSCLC PDX model in Balb/c nude mice (a) Study Objective

The objective of the research is to evaluate the in vivo anti-tumor efficacy of test articles in the LU-01-0046 NSCLC PDX model in Balb/c nude mice.

(b) Experimental Design

1	Vehicle	5	--	10	iv	qw
2	BCY6033	5	1/2	10	iv	qw
3	BCY6033	5	3	10	iv	qw
4	BCY6136	5	1/2	10	iv	qw
5	BCY6136	5	3	10	iv	qw
6	BCY6082	5	1	10	iv	qw
7	BCY6082	5	3	10	iv	qw

8	Vehicle	5	--	10	iv	qw
9	BCY6173	5	1	10	iv	qw
10	BCY6173	5	3	10	iv	qw
11	BCY6175	5	3	10	iv	qw
12	BCY6031	5	3	10	iv	qw

(c) Experimental Methods and Procedures (i) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with LU-01-0046 of tumor fragment (~30 mm³) for tumor development. The treatment was started when the average tumor volume reaches 200 mm³ for part 1 study and 192 mm³ for part 2 study. The test article administration and the animal numbers in each group are shown in the experimental design table.

(ii) Testing Article Formulation Preparation

Vehicle	-	50mM Acetate 10% sucrose pH 5
BCY6033	0.1
	0.3	Dilute 450 µl 1 mg/ml BCY6033 stock with 1050 µl Acetate buffer
BCY6136	0.1	Dilute 150 µl 1 mg/ml BCY6136 stock with 1350 µl Acetate buffer
	0.3	Dilute 450 µl 1 mg/ml BCY6136 stock with 1050 µl Acetate buffer
BCY6082	0.1	Dilute 150 µl 1 mg/ml BCY6082 stock with 1350 µl Acetate buffer
	0.3	Dilute 450 µl 1 mg/ml BCY6082 stock with 1050 µl Acetate buffer
BCY6173	0.1	Dissolve 3.65 mg BCY6173 in 3.5 ml Acetate buffer to make 1 mg/ml stock. Dilute 150 µl 1 mg/ml BCY6173 with 1350 µl Acetate buffer
	0.3	Dilute 450 µl 1 mg/ml BCY6173 stock with 1050 µl Acetate buffer
BCY6175	0.3	Dissolve 3.02 mg BCY6175 in 2.9 ml Acetate buffer to make 1mg/ml stock. Dilute 450 µl 1 mg/ml BCY6175 with 1050 µl Acetate buffer
BCY6031	0.3	Dissolve 5.72 mg BCY6031 in 5.6 ml Acetate buffer to make 1mg/ml stock. Dilute 450 µl 1 mg/ml BCY6031 with 1050 µl Acetate buffer

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve are shown in Figures 18 to 22.

(ii) Tumor Volume Trace

Mean tumor volume on day 21 after the start of treatment in female Balb/c nude mice bearing LU-01-0046 is shown in Tables 39 and 40. Table 39: Tumor volume trace over time (Part 1)

		202±2 6	328±4 8	536±6 8	953±10 7	1386±97	1833±13 2	2551±24 2
		201±2 3	285±4 7	449±8 7	623±11 2	891±196	967±228	1285±23 4
		201±2 6	187±4 3	91±34	37±14	3±3	0±0	0±0
		200±3 3	293±5 6	426±9 1	682±15 1	964±194	976±258	1285±23 4
		201±3 3	194±3 1	135±2 7	52±18	13±9	4±4	0±0
		201±2 9	295±4 3	466±6 5	877±80	1201±10 6	1502±10 8	1826±22 4
		201±3 4	235±3 6	310±4 4	398±65	634±136	729±184	1042±29 0

Table 40: Tumor volume trace over time (Part 2)

		192±3 0	311±8 3	562±14 6	830±23 0	1320±44 4	1652±52 8	2342±65 1
		191±3 3	318±5 8	553±88	817±16 5	1314±27 6	1546±27 6	2151±26 2
		192±3 7	259±5 1	400±53	455±28	636±92	646±138	890±260
		192±4 2	186±5 7	92±38	19±11	0±0	0±0	0±0
		191±3 8	207±4 6	387±70	355±11 0	544±159	643±185	874±281

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for test articles in the LU-01-0046 PDX model was calculated based on tumor volume measurements at day 21 after the start of the treatment. Table 41: Tumor growth inhibition analysis (Part 1)

2551±242	--	--	--
1285±234	50.4	53.9
0±0	0.0	108.6
1285±234	50.4	53.9
0±0	0.0	108.5
1826±224	71.6	30.8
1042±290	40.8	64.2

Table 41: Tumor growth inhibition analysis (Part 1)

a. Mean ± SEM; b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

Table 42: Tumor growth inhibition analysis (Part 2)

2342±651	--	--	--
2151±262	91.8	8.9
890±260	38.0	67.5
0±0	0.0	108.9
874±281	37.3	68.2

Table 42: Tumor growth inhibition analysis (Part 2)

a. Mean ± SEM; b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of test articles in the LU-01-0046 PDX model was evaluated. The measured body weights and tumor volumes of all treatment groups at various time points are shown in the Figures 18 to 22 and Tables 39 to 42.

In part 1 study, the mean tumor size of vehicle treated mice reached 2551 mm³ on day 21 after the start of treatment.

BCY6033 at 1/2 mg/kg, qw (TV=1285 mm³, TGI=53.9%, p<0.001) and BCY6136 at 1/2 mg/kg, qw (TV=1285 mm³, TGI=53.9%, p<0.001) produced significant anti-tumor activity, but didn't exhibit any tumor regression. BCY6033 at 3 mg/kg, qw (TV=0 mm³, TGI=108.6%, p< 0.001) and BCY6136 at 3 mg/kg, qw (TV=0 mm³, TGI=108.5%, p<0.001) completely eradicated the tumors, 1 of 5 tumors respectively in BCY6033 and BCY6136 3 mg/kg groups showed regrowth after the dosing suspension and the tumors were resistant to BCY6033 or BICY6136 treatment when resuming the dosing. The remaining tumors in the BCY6033 and BCY6136 groups (4/5 for each group) showed no regrowth after 80 days of dosing suspension. BCY6082 at 1 mg/kg, qw (TV=1826 mm³, TGI=30.8%, p<0.05) and 3 mg/kg, qw (TV=1042 mm³, TGI=64.2%, p<0.001) produced dose-dependent anti-tumor activity, but didn't show tumor regression.

In part 2 study, the mean tumor size of vehicle treated mice reached 2342 mm³ on day 21 after the start of treatment. BCY6173 at 1 mg/kg, qw (TV=2151 mm³, TGI=8.9%,p>0.05) did not show anti-tumor antitumor activity. BCY6173 at 3 mg/kg, qw (TV=890 mm³, TGI=67.5%, p<0.05) produced obvious anti-tumor activity.

BCY6175 at 3 mg/kg, qw (TV=0 mm³, TGI=108.9%, p<0.001) completely eradicated 4/5 tumors on day 14. BCY6031 at 3 mg/kg, qw (TV=874 mm³, TGI=68.2%, p<0.05) produced obvious anti-tumor activity, but didn't show any tumor regression.

Study 15: In vivo efficacy study of BCY6136 in the LU-01-0412 NSCLC PDX model in Balb/c nude mice (a) Study Objective

The objective of the project is to evaluate the in vivo therapeutic efficacy of BCY6136 in the LU-01-0412 NSCLC PDX model in BALB/c nude mice.

(b) Experimental Design

1	Vehicle	6	--	10	iv	Qw, 4
2	BCY6136	6	1	10	iv	Qw, 4
3	BCY6136	6	3	10	iv	Qw, 4
4	BCY8245	6	3	10	iv	Qw, 4
5	BCY8781	6	3	10	iv	Qw, 4

(c) Experimental Methods and Procedures (i) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with LU-01-0412 tumor fragment (~30 mm³) for tumor development. Animals were randomized when the average tumor volume reached 159 mm³. The test article administration and the animal numbers in each group were shown in the experimental design table.

(ii) Testing Article Formulation Preparation

Vehicle	-	25 mM Histidine 10% sucrose pH7
BCY6136	1	Dissolve 6.06 mg BCY6136 in 5.969 ml 50 mM Acetate/acetic acid pH5 10%sucrose
	0.1	Dilute 180 µl 1 mg/ml BT5528 with 1620 µl 50 mM Acetate/acetic acid pH5 10%sucrose

	0.3	Dilute 540 µl 1 mg/ml BT5528 with 1260 ul 50 mM Acetate/acetic acid pH5 10%sucrose
BCY8245	1	Dissolve 4.15 mg BCY8245 powder in 4.121 ml vehicle buffer
	0.3	Dilute 540 µl 1 mg/ml BCY8245 with 1260 µl vehicle buffer
BCY8781	1	Dissolve 4.08 mg BCY8781 powder in 80.8 µl DMSO, then dilute to 1 mg/ml with 3.958 vehicle buffer
	0.3	Dilute 540 µl 1 mg/ml BCY8781 with 1260 µl vehicle buffer

(iii) Sample Collection

Plasma from vehicle and 3 extra mice treated with BCY6136, BCY8245 and BCY8781 were collected at 30 min and 24 h post dosing. Tumor from vehicle and 3 extra mice treated with BCY6136, BCY8245 and BCY8781 were collected at 24 h post dosing.

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curves are shown in Figure 23.

(ii) Tumor Volume Trace

Mean tumor volume over time in female BALB/c nude mice bearing LU-01-0412 xenograft is shown in Table 43. Table 43: Tumor volume trace over time

	159±11	159±13	159±11	159±12	159±11
	255±12	214±16	197±16	168±18	176±21
	309±20	237±16	195±16	132±10	167±13
	395±31	246±19	156±18	78±4	107±15
	464±31	300±18	177±29	45±5	72±12
	521±26	369±32	210±32	21±2	44±8
	611±33	470±46	225±32	11±1	31±6
	737±68	632±47	252±37	6±1	20±6
	788±80	664±52	299±37	2±1	14±5
	1104±142	758±70	416±52	1±1	12±5

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCY6136, BCY8245 and BCY8781 in the LU-01-0412 xenograft model was calculated based on tumor volume measurements on day 32 after the start of the treatment. Table 44: Tumor growth inhibition analysis

1104±142	--	--	--
		758±70	68.6	36.7
		416±52	37.6	72.9
		1±1	0.1	116.8
		12±5	1.0	115.6

Table 44: Tumor growth inhibition analysis

a. Mean ± SEM; b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of BCY6136, BCY8245 and BCY8781 in the LU-01-0412 xenograft model was evaluated. The measured body weight and tumor volume of all treatment groups at various time points are shown in Figure 23 and Tables 43 and 44.

The mean tumor volume of vehicle treated mice reached 1104 mm³ on day 32 after the start of treatment. BCY6136 at 1 mg/kg, qw *4 (TV=758 mm³, TGI=36.7%, p<0.05) and 3 mg/kg, qw*4 (TV=416 mm³, TGI=72.9%, p<0.001) produced dose-dependent antitumor activity, but didn't show any tumor regression. BCY8245 at 3 mg/kg, qw*4 (TV=1 mm³, TGI=116.8%, p<0.001) and BCY8781 at 3 mg/kg, qw*4 (TV=12 mm³, TGI=115.6%, p<0.001) regressed the tumors obviously. Among them, 5 of 6 tumor treated with BCY8245 3 mg/kg and 2 of 6 tumor treated with d BCY8781 3 mg/kg were completely eradicated on day 32.

In this study, animals in all groups maintained the body weight well.

Study 16: In vivo efficacy study of BCY6136 in treatment of LU-01-0486 PDX model in Balb/c nude mice (a) Study Objective

The objective of the research is to evaluate the in vivo anti-tumor efficacy of BCY6136 in the LU-01-0486 PDX model in Balb/c nude mice.

(b) Experimental Design

1	Vehicle	5	--	10	iv	qw
2	BCY6136	5	1	10	iv	qw
3	BCY6136	5	2	10	iv	qw
4	BCY6136	5	3	10	iv	qw

(c) Experimental Methods and Procedures (i) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with LU-01-0486 of tumor fragment (~30 mm³) for tumor development. The treatment was started when the average tumor volume reached 180 mm³ for efficacy study. The test article administration and the animal number in each group are shown in the experimental design table.

(ii) Testing Article Formulation Preparation

Vehicle	--	50 mM Acetate 10% sucrose pH 5
BCY6136	0.3	0.3 mg/ml BCY6136 was prepared as described in Study 10
	0.2
	0.1	Dilute 470 µl 0.3 mg/ml BCY6136 with 940 µl Acetate buffer

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve are shown in Figure 24.

(ii) Tumor Volume Trace

Mean tumor volume on day 14 after the start of treatment in female Balb/c nude mice bearing LU-01-0486 xenograft is shown in Table 45. Table 45: Tumor volume trace over time

1	Vehicle, qw	179±20	232±30	358±45	450±47	651±112
2	BCY6136, 1 mpk, qw	180±23	221±20	326±34	420±34	638±71
3	BCY6136, 2 mpk, qw	179±27	222±26	365±44	459±82	645±105
4	BCY6136, 3 mpk, qw	180±25	209±37	304±51	348±77	449±115

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCY6136 in the LU-01-0486 PDX model was calculated based on tumor volume measurement at day 14 after the start of the treatment. Table 46: Tumor growth inhibition analysis

651±112	--	--	--
638±71	98.0	3.0
645±105	99.1	1.2
449±115	68.9	43.1

Table 46: Tumor growth inhibition analysis

a. Mean ± SEM; b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of BCY6136 in LU-01-0486 PDX model was evaluated. The measured body weight and tumor volume of all treatment groups at various time points are shown in the Figure 24 and Tables 45 and 46.

In this study, the mean tumor volume of vehicle treated mice reached 651 mm³ on day 14 after the start of treatment. BCY6136 at 1 mg/kg, qw (TV=638 mm³, TGI=3.0%, p>0.05) and 2 mg/kg, qw (TV=645 mm³, TGI=1.2%, p>0.05) didn't show any anti-tumor activity. BCY6136 at 3 mg/kg, qw (TV=449 mm³, TGI=43.1%, p> 0.05) produced slight anti-tumor activity without statistical significance.

Study 17: In vivo efficacy test of BCY6033, BCY6136 and BCY6082 in treatment of MDA-MB-231-luc xenograft in Balb/c nude mice (a) Study Objective

The objective of the research was to evaluate the in vivo anti-tumor efficacy of BCY6033, BCY6136 and BCY6082 in treatment of MDA-MB-231-luc xenograft model in Balb/c nude mice.

(b) Experimental Design

1	Vehicle	3	--	10	qw
2	BCY6033	3	1	10	qw
3	BCY6033	3	2	10	qw
4	BCY6033	3	3	10	qw
5	BCY6136	3	1	10	qw
6	BCY6136	3	2	10	qw
7	BCY6136	3	2	10	qw
8	BCY6082	3	2	10	qw
9	BCY6082	3	5	10	qw

(c) Experimental Methods and Procedures (i) Cell Culture

The cells growing in an exponential growth phase were harvested and counted for tumor inoculation.

(ii) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with MDA-MB-231-luc tumor cells (10× 10^6) in 0.1ml of PBS with 0.1 ml matrigel for tumor development. 36 animals were randomized when the average tumor volume reached 159 mm³. The test article administration and the animal numbers in each group were shown in the experimental design table.

(iii) Testing Article Formulation Preparation

Vehicle
BCY6033	1	Dissolve 6.71 mg BCY6033 into 6.710 ml formulation buffer
	0.3	Dilute 270 µl 1 mg/ml BCY6033 into 630 µl formulation buffer
	0.2	Dilute 180 µl 1 mg/ml BCY6033 into 720 µl formulation buffer
	0.1	Dilute 90 µl 1 mg/ml BCY6033 into 810 µl formulation buffer
BCY6136	1	Dissolve 3.79 mg BCY6136 into 3.695ml formulation buffer
	0.3	Dilute 270 µl 1 mg/ml BCY6136 into 630 µl formulation buffer
	0.2	Dilute 180 µl 1 mg/ml BCY6136 into 720 µl formulation buffer
	0.1	Dilute 90 µl 1 mg/ml BCY6136 into 810 µl formulation buffer
BCY6082	1	Weigh and dissolve 4.30 mg BCY6082 into 4.162 ml formulation buffer
	0.5	Dilute 450 µl 1 mg/ml BCY6082 into 450 µl formulation buffer
	0.2*	Dilute 180 µl 1 mg/ml BCY6082 into 720 µl formulation buffer

(iv) Sample Collection

On PG-D24, we collected and fixed the tumors of Group 1, 8 and 9 for FFPE.

On PG-D33, we collected and fixed the tumors of Group 2 and 5 for FFPE.

At the end of study, we collected and fixed the tumors of Group 3, 4, 6 and 7 for FFPE.

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth are shown in Figures 25 to 27.

(ii) Tumor Volume Trace

Mean tumor volume over time in female Balb/c nude mice bearing MDA-MB-231-luc xenograft is shown in Tables 47 to 49. Table 47: Tumor volume trace (PG-D0~PG-D17)

		159±1 4	269±8	306±1 9	425±5 2	688±5 4	908±5 4	1064±9 8	1315±9 5
		159±6	219±1 9	221±5 5	296±7 6	329±6 4	421±7 7	479±84	609±12 2
		159±1 0	240±7 3	215±5 7	201±4 7	109±3 6	84±34	64±32	59±35
		158±7	189±2 7	147±3 2	109±2 6	79±11	66±7	41±5	31±6
		159±1 0	226±3 6	221±5 4	310±7 2	416±8 9	526±7 7	636±92	809±13 5
		159±1 6	218±1 7	182±2 2	182±2 6	101±2 0	77±24	36±4	41±10
		158±5	241±1 2	259±6	325±1 4	258±1 2	246±1 5	162±19	178±10
		159±1 3	210±1 0	242±1 6	305±1 9	445±5 8	611±7 6	734±13 9	926±10 5
		159±7	227±3 1	247±4 7	250±6 5	276±7 9	241±6 1	220±56	184±85

Table 48: Tumor volume trace (PG-D19~PG-D33)

		1453±12 8	1661±17 3	--	--	--	--	--
		724±162	880±156	1069±18 9	1182±16 4	1342±16 6	1647±11 3	--
		61±35	67±44	100±76	133±96	163±106	221±143	257±15 2
		29±7	22±12	22±8	21±9	21±10	43±20	57±29
		879±190	994±213	1253±31 3	1431±35 3	1507±25 3	2181±60 9	--
		35±9	33±9	31±17	41±32	59±45	82±59	87±71
		171±21	132±19	108±19	85±15	81±8	87±14	92±18
		1034±17 8	1287±94	--	--	--	--	--
		214±120	218±146	--	--	--	--	--

Table 49: Tumor volume trace (PG-D35~PG-D47)

		352±210	456±271	525±302	683±400	738±429	853±476
		79±47	118±71	139±82	220±125	312±176	423±222
		124±106	156±120	179±142	239±197	285±239	350±298
		129±38	173±65	181±65	269±113	293±114	371±128

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCY6033, BCY6136 and BCY6082 in the MDA-MB-231-luc xenograft model was calculated based on tumor volume measurements at day 21 after the start of treatment. Table 50: Tumor growth inhibition analysis

1661±173	--	--	--
880±156	53.0	52.0
67±44	4.1	106.1
22±12	1.3	109.1
994±213	59.8	44.4
33±9	2.0	108.4
132±19	8.0	101.7
1287±94	77.5	24.9
218±146	13.1	96.1

Table 50: Tumor growth inhibition analysis

a. Mean ± SEM. b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of BCY6033, BCY6136 and BCY6082 in the MDA-MB-231-luc xenograft model was evaluated. The measured body weights and tumor volumes of all treatment groups at various time points are shown in the Figures 25 to 27 and Tables 47 to 50.

The mean tumor size of vehicle treated mice reached 1661 mm³ on day 21. BCY6033 at 1 mg/kg (TV=880 mm³, TGI=52.0%, p<0.001), 2 mg/kg (TV=67 mm³, TGI=106.1%, p<0.001) and 3 mg/kg (TV=22 mm³, TGI=109.1%, p<0.001) produced dose-dependent antitumor activity. BCY6033 at 2 mg/kg and 3 mg/kg regressed the tumors potently, but the tumors showed obvious re-growth from day 21.

BCY6136 at 1 mg/kg (TV=994 mm³, TGI=44.4%, p<0.01) showed moderate antitumor activity, BCY6136 at 2 mg/kg (TV=33 mm³, TGI=108.4%, p<0.001) and 3 mg/kg (TV=132 mm³, TGI=101.1%, p<0.001) produced potent antitumor activity, but the tumors showed obvious re-growth from day 28.

BCY6082 at 2 mg/kg (TV=1287 mm3, TGI=24.9%, p>0.05) didn't show obvious antitumor activity, BCY6082 at 5 mg/kg (TV=218 mm3, TGI=96.1%, p<0.001) produced significant antitumor activity.

In this study, one mouse treated with BCY6136 2 mg/kg lost over 15% bodyweight during the treatment schedule, other mice maintained the bodyweight well.

Study 18: In vivo efficacy test of BCY6136 in treatment of EMT-6 syngeneic model in BALB/c mice (a) Study Objective

The objective of the research was to evaluate the in vivo anti-tumor efficacy of BCY6136 in treatment of EMT-6 syngeneic model in BALB/c mice.

(b) Experimental Design

1	Vehicle	--	5	iv	qw*4	tumors from spare mice will be collected for FACS
2	BCY6136	3	5	iv	qw*4
3	BCY6136		5	iv	qw*4
4	BCY6136		5	iv	qw*4

a. The injection volume of each mouse is 10 ml/kg. b. The dosage of group 3 and group 4 was changed to 5 mpk and 3 mpk from Day 14.

(c) Experimental Methods and Procedures (i) Cell Culture

The EMT-6 tumor cells were maintained in vitro as a monolayer culture in EMEM medium supplemented with 10% heat inactivated fetal bovine serum at 37°C in an atmosphere of 5% CO₂ in air. The tumor cells were routinely subcultured twice weekly by trypsin-EDTA treatment.

The cells growing in an exponential growth phase were harvested and counted for tumor inoculation.

(ii) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with EMT-6 tumor cells (5 x 10⁶) in 0.1 ml of PBS for tumor development. 44 animals were randomized when the average tumor volume reached 75 mm³. The test article administration and the animal numbers in each group were shown in the experimental design table.

(iii) Testing Article Formulation Preparation

Vehicle/buffer	--	50 mM Acetate, 10% sucrose pH=5
BCY6136	1	Dissolve 6.2 mg BCY6136 with 6113 ul buffer
BCY6136	0.3	Dilute 450 µl 1 mg/ml BCY6136 stock with 1050 µl buffer
BCY6136	0.1	Dilute 150 µl 1 mg/ml BCY6136 stock with 1350 µl buffer
BCY6136	0.03	Dilute 45 µl 1 mg/ml BCY6136 stock with 1455 µl buffer

Vehicle/buffer	--	50 mM Acetate, 10% sucrose pH=5
BCY6136	1	stock
BCY6136	0.3	Dilute 420 µl 1 mg/ml BCY6136 stock with 980 µl buffer
BCY6136	0.3	Dilute 420 µl 1 mg/ml BCY6136 stock with 980 µl buffer
BCY6136	0.5	Dilute 700 µl 1 mg/ml BCY6136 stock with 700 µl buffer

(iv) Sample Collection

3 tumors from spare mice were collected for FACS on day 11. The data was supplied by biology team.

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve are shown in Figure 28.

(ii) Tumor Volume Trace

Mean tumor volume over time in female BALB/c mice bearing EMT-6 syngeneic is shown in Table 51. Table 51: Tumor volume trace over time

		82± 4	141± 11	260± 24	443± 90	557± 99	703± 119	812± 139	948± 191	1129 ±248	1499 ±340
		82± 4	58± 1	59± 2	125± 18	240± 23	322± 23	374± 22	431± 37	486± 50	561± 61
		82± 4	108± 18	204± 27	350± 57	426± 49	588± 72	691± 65	850± 98	1018 ±115	1272 ±140
		82± 4	130± 16	255± 35	358± 34	450± 67	607± 94	731± 112	872± 119	1082 ± 133	1394 ±161

Table 51: Tumor volume trace over time

The dosage of group 3 and group 4 was changed to 5 mpk and 3 mpk from Day 14.

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCY6136 in EMT-6 syngeneic model was calculated based on tumor volume measurements on day 21 after the start of treatment. Table 52: Tumor growth inhibition analysis

1499±340	--	--	--
561±61	37.4	66.2
1272±140	84.8	16.1	ns
1394±161	93.0	7.4	ns

Table 52: Tumor growth inhibition analysis

a. Mean ± SEM. b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C). c. The dosage of group 3 and group 4 was changed to 5 mpk and 3 mpk from Day 14.

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of BCY6136 in EMT-6 syngeneic model was evaluated. The measured body weights and tumor volumes of all treatment groups at various time points are shown in the Figure 28 and Tables 51 and 52.

The mean tumor size of vehicle treated mice reached 1499 mm³ on day 21. BCY6136 at 3 mg/kg, qw (TV=561 mm³, TGI=66.2%, p<0.05) showed obvious antitumor activity. BCY6136 at 1/5 mg/kg, qw (TV=1272 mm³, TGI=16.1%, p>0.05) and BCY6136 at 0.3/3 mg/kg, qw (TV=1394 mm³, TGI=7.4%, p>0.05) didn't show any antitumor activity.

The dosage of group 3 and group 4 was changed to 5 mpk and 3 mpk from day 14. Tumor ulceration was found in mouse 3-5 on Day 14, and the mice was deal with antibiotic cream. In this study, all mice maintained the bodyweight well.

Study 19: In vivo efficacy study of BCY6136 in treatment of NCI-N87 xenograft in Balb/c nude mice (a) Study Objective

The objective of the research is to evaluate the in vivo anti-tumor efficacy of BCY6136 in treatment of NCI-N87 xenograft in Balb/c nude mice.

(b) Experimental Design

1	Vehicle	3	--	10	Qw
2	BCY6136	3	1	10	Qw
3	BCY6136	3	2	10	Qw
4	BCY6136	3	3	10	Qw

(c) Experimental Methods and Procedures (i) Cell Culture

The NCI-N87 tumor cells were maintained in RPMI-1640 medium supplemented with 10% heat inactivated fetal bovine serum at 37°C in an atmosphere of 5% CO₂ in air. The tumor cells were routinely subcultured twice weekly. The cells growing in an exponential growth phase were harvested and counted for tumor inoculation.

(ii) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with NCI-N87 tumor cells (10 x 10⁶) with matrigel (1:1) in 0.2 ml of PBS for tumor development. The animals were randomized and treatment was started when the average tumor volume reached approximately 176 mm³. The test article administration and the animal number in each group are shown in the experimental design table.

(iii) Testing Article Formulation Preparation

Vehicle	-	50 mM Acetate 10% sucrose pH 5
BCY6136	1
	0.1	Dilute 90 µl 1 mg/ml BCY6136 stock with 810 µl Acetate buffer
	0.2	Dilute 180 µl 1 mg/ml BCY6136 stock with 720 µl Acetate buffer
	0.3	Dilute 270 µl 1 mg/ml BCY6136 stock with 630 µl Acetate buffer

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve is shown in Figure 29.

(ii) Tumor Volume Trace

Mean tumor volume over time in female Balb/c nude mice bearing NCI-N87 xenograft is shown in Table 53. Table 53: Tumor volume trace over time

		17 4± 7	21 3± 5	26 6± 6	42 1± 10	53 7± 17	59 8± 30	73 4± 46	82 1± 55	91 8± 91	1024 ±83	1151 ±68	1305 ±57	1407 ±64	1465 ±90
		17 6± 7	20 0± 8	21 0± 14	22 4± 27	23 8± 21	18 4± 18	24 4± 23	27 6± 35	30 8± 44	343 ±37	390 ±43	406 ±48	422 ±42	425 ±47
		17 6± 18	19 7± 25	16 8± 25	17 0± 26	16 5± 34	96 ±2 7	13 3± 35	15 0± 52	16 0± 49	190 ±63	203 ±65	218 ±66	201 ±53	210 ±60
		17 7± 8	19 7± 9	16 9± 7	15 8± 3	14 8± 8	95 ±1 6	14 1± 12	14 5± 24	16 4± 28	202 ±28	205 ±30	201 ±16	196 ±21	201 ±22

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCY6136 in the NCI-N87 xenograft was calculated based on tumor volume measurements at day 30 after the start of treatment. Table 54: Tumor growth inhibition analysis

1465±90	--	--	--
425±47	29.0	80.7
210±60	14.3	97.4
201±22	13.7	98.1

Table 54: Tumor growth inhibition analysis

a. Mean ± SEM. b. Tumor growth inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of BCY6136 in the NCI-N87 model was evaluated. The measured body weight and tumor volume of all treatment groups at various time points are shown in the Figure 29 and Tables 53 and 54.

The mean tumor size of vehicle treated mice reached 1465 mm³ on day 30. BCY6136 at 1 mg/kg, qw (TV=425 mm³, TGI=80.7%, p<0.001) and 2 mg/kg, qw (TV=210 mm³, TGI=97.4%, p<0.001) produced significant antitumor activity in a dose-dependent manner, BCY6136 at 3 mg/kg, qw (TV=201 mm³, TGI=98.1%, p<0.001) showed comparable antitumor activity with BCY6136 at 2 mpk.

In this study, no obvious body weight loss was found in all the groups during the treatment schedule.

Study 20: In vivo efficacy study of BCY6136 in treatment of SK-OV-3 xenograft in Balb/c nude mice (a) Study Objective

The objective of the research is to evaluate the in vivo anti-tumor efficacy of BCY6136 in treatment of SK-OV-3 xenograft in Balb/c nude mice.

(b) Experimental Design

1	Vehicle	3	--	10	Qw
2	ADC	3	3	10	Qw
3	BCY6136	3	1	10	Qw
4	BCY6136	3	2	10	Qw
5	BCY6136	3	3	10	Qw

(c) Experimental Methods and Procedures (i) Cell Culture

The SK-OV-3 tumor cells were maintained in McCoy's 5a medium supplemented with 10% heat inactivated fetal bovine serum at 37°C in an atmosphere of 5% CO₂ in air. The tumor cells were routinely subcultured twice weekly. The cells growing in an exponential growth phase were harvested and counted for tumor inoculation.

(ii) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with SK-OV-3 tumor cells (10 x 10⁶) with matrigel (1:1) in 0.2 ml of PBS for tumor development. The animals were randomized and treatment was started when the average tumor volume reached approximately 186 mm³. The test article administration and the animal number in each group are shown in the experimental design table.

(iii) Testing Article Formulation Preparation

Vehicle	-	-	50 mM Acetate 10% sucrose pH5
BCY6136	98.5%	1
		0.1
		0.2
		0.3
ADC	ADC	0.3

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve is shown in Figure 30.

(ii) Tumor Volume Trace

Mean tumor volume over time in female Balb/c nude mice bearing SK-OV-3 xenograft is shown in Table 55. Table 55: Tumor volume trace over time

		18 7± 16	24 3± 24	31 3± 28	39 9± 37	47 0± 23	60 6± 61	742 ±10 3	891 ±133	1076 ±185	1173 ±214	1340 ±236	1490 ±273	1560 ±305
		18 7± 16	18 1± 15	21 2± 16	26 3± 35	26 8± 14	33 5± 23	353 ±18	392 ±63	449 ±4	481 ±27	573 ±33	647 ±26	684 ±111
		18 6± 23	22 2± 19	29 3± 34	33 1± 21	35 6± 23	44 0± 8	503 ±28	587 ±33	702 ±43	752 ±26	893 ±34	1002 ±68	1035 ±67
		18 6± 23	17 0± 18	16 4± 28	18 8± 33	18 0± 34	20 2± 29	200 ±29	230 ±46	229 ±48	231 ±58	236 ±49	240 ±48	277 ±58
		18 4± 24	16 8± 18	15 0± 12	16 4± 12	15 8± 8	18 0± 8	187 ±4	212 ±17	208 ±29	204 ±12	205 ±17	227 ±31	254 ±48

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCY6136 in the SK-OV-3 xenograft was calculated based on tumor volume measurements at day 28 after the start of treatment. Table 56: Tumor growth inhibition analysis

1560±305	--	--	--
684±111	43.9	63.8
1035±67	66.4	38.1
277±58	17.8	93.3
254±48	16.3	95.0

Table 56: Tumor growth inhibition analysis

a. Mean ± SEM. b. Tumor growth inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of BCY6136 in the SK-OV-3 model was evaluated. The measured body weight and tumor volume of all treatment groups at various time points are shown in the Figure 30 and Tables 55 and 56.

The mean tumor size of vehicle treated mice reached 1560 mm³ on day 28. ADC at 3 mg/kg, qw (TV=684 mm³, TGI=63.8%, p<0.01) showed moderate anti-tumor efficacy. BCY6136 at 1 mg/kg, qw (TV=1035 mm³, TGI=38.1%, p>0.05) didn't show obvious anti-tumor activity. BCY6136 at 2 mg/kg, qw (TV=277 mm³, TGI=93.3%, p<0.001) and 3 mg/kg, qw (TV=254 mm³, TGI=95.0%, p<0.001) produced significant anti-tumor activity.

In this study, no obvious body weight loss was found in all the groups during the treatment schedule.

Study 21: In vivo efficacy study of BCY6136 in treatment of OE21 xenograft in Balb/c nude mice (a) Study Objective

The objective of the research is to evaluate the in vivo anti-tumor efficacy of BCY6136 in treatment of OE21 xenograft in Balb/c nude mice.

(b) Experimental Design

1	Vehicle	3	--	10	qw
2	BCY6136	3	1	10	qw
3	BCY6136	3	2	10	qw
4	BCY6136	3	3	10	qw

(c) Experimental Methods and Procedures (i) Cell Culture

The OE21 tumor cells were maintained in RPMI-1640 medium supplemented with 10% heat inactivated fetal bovine serum at 37°C in an atmosphere of 5% CO₂ in air. The tumor cells were routinely subcultured twice weekly. The cells growing in an exponential growth phase were harvested and counted for tumor inoculation.

(ii) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with OE21 tumor cells (5 x 10⁶) with matrigel (1:1) in 0.2 ml of PBS for tumor development. The animals were randomized and treatment was started when the average tumor volume reached approximately 157 mm³. The test article administration and the animal number in each group are shown in the experimental design table.

(iii) Testing Article Formulation Preparation

Vehicle	-	50 mM Acetate 10% sucrose pH 5
BCY6136	1
	0.1	Dilute 90 µl 1 mg/ml BCY6136 stock with 810 µl Acetate buffer
	0.2	Dilute 180 µl 1 mg/ml BCY6136 stock with 720 µl Acetate buffer
	0.3	Dilute 270 µl 1 mg/ml BCY6136 stock with 630 µl Acetate buffer

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve is shown in Figure 31.

(ii) Tumor Volume Trace

Mean tumor volume over time in female Balb/c nude mice bearing OE21 xenograft is shown in Table 57. Table 57: Tumor volume trace over time

		155±9	211±16	291±16	379±14	456±32	539±13	828±42	955±40	1035±58	1250±46	1586±57
		159±14	202±28	251±29	282±6	331±19	392±35	609±56	694±44	777±68	1083±85	1155±98
		157±19	197±13	219±6	235±27	268±35	243±37	346±78	371±98	396±109	515±94	537±122
		155±19	200±16	197±7	209±11	229±26	211±14	289±38	318±53	330±40	474±42	489±51

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCY6136 in the OE21 xenograft was calculated based on tumor volume measurements at day 23 after the start of treatment. Table 58: Tumor growth inhibition analysis

1586±57	--	--	--
1155±98	72.8	30.4
537±122	33.9	73.4
489±51	30.8	76.7

Table 58: Tumor growth inhibition analysis

a. Mean ± SEM. b. Tumor growth inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of BCY6136 in the OE21 model was evaluated. The measured body weight and tumor volume of all treatment groups at various time points are shown in the Figure 31 and Tables 57 and 58.

The mean tumor size of vehicle treated mice reached 1586 mm³ on day 23. BCY6136 at 1 mg/kg, qw (TV= 1155 mm³, TGI = 30.4% p<0.05) showed slight anti-tumor activity. BCY6136 at 2 mg/kg, qw (TV=537 mm³, TGI=73.4%, p<0.001) and 3 mg/kg, qw (TV=489 mm³, TGI=76.7%, p<0.001) produced significant anti-tumor activity.

In this study, no obvious body weight loss was found in all the groups during the treatment schedule.

Study 22: In vivo efficacy test of BCY6136 and BCY6082 in treatment of MOLP-8 xenograft in CB17-SCID mice (a) Study Objective

The objective of the research is to evaluate the in vivo anti-tumor efficacy of BCY6136 and BCY6082 in treatment of MOLP-8 xenograft in CB17-SCID mice.

(b) Experimental Design

1	Vehicle	3	--	10	qw
2	BCY6136	3	1	10	qw
3	BCY6136	3	2	10	qw
4	BCY6136	3	3	10	qw
5	BCY6082	3	1	10	qw
6	BCY6082	3	2	10	qw
7	BCY6082	3	3	10	qw

(c) Experimental Methods and Procedures (i) Cell Culture

The MOLP-8 tumor cells were maintained in vitro as a monolayer culture in RMPI-1640 supplemented with 20% heat inactivated fetal bovine serum at 37°C in an atmosphere of 5% CO₂ in air. The tumor cells were routinely subcultured by trypsin-EDTA treatment. The cells growing in an exponential growth phase were harvested and counted for tumor inoculation.

(ii) Tumor Inoculation

Each mouse was inoculated subcutaneously at the right flank with MOLP-8 tumor cells (10 x 10⁶) in 0.2 ml PBS with 50% matrigel for tumor development. 36 animals were randomized when the average tumor volume reached 141 mm³. The test article administration and the animal numbers in each group were shown in the experimental design table.

(iii) Testing Article Formulation Preparation

Vehicle	--	50 mM Acetate, 10% sucrose pH=5
BCY6136	0.1	Dilute 90 µl 1 mg/ml BCY6136 stocks* with 810 µl buffer***
	0.2	Dilute 180 µl 1 mg/ml BCY6136 stocks* with 720 µl buffer***
	0.3	Dilute 270 µl 1 mg/ml BCY6136 stocks* with 630 µl buffer***
BCY6082	0.1	Dilute 90 µl 1 mg/ml BCY6082 stocks** with 810 µl buffer***
	0.2	Dilute 180 µl 1 mg/ml BCY6082 stocks** with 720 µl buffer***
	0.3	Dilute 270 µl 1 mg/ml BCY6082 stocks** with 630 µl buffer***

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve are shown in Figures 32 and 33.

(ii) Tumor Volume Trace

Mean tumor volume over time in female CB17-SCID mice bearing MOLP-8 xenograft is shown in Table 59. Table 59: Tumor volume trace over time

		139±2	375±3 6	604±2 8	984±8 8	1451±1 33	1981±1 96	2528±2 95
		143±1 3	299±6	444±4 9	576±3 1	806±85	1132±1 70	1446±2 34
		140±1 5	271±4 3	250±2	509±2 3	662±78	873±49	1218±1 44
		142±1 9	239±6 7	197±2 0	342±7 8	425±90	693±13 3	938±15 5
		142±4	303±4 9	456±8 3	809±1 69	1365±2 77	1708±1 90	2296±5 11
		139±5	273±4 6	428±1 8	682±5 0	945±73	1240±8 5	1554±8 4
		142±4	219±7	369±7 7	471±8 1	656±11 5	997±21 2	1321±3 36

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCY6136 and BCY6082 in the MOLP-8 xenograft model was calculated based on tumor volume measurements at day 14 after the start of treatment. Table 60: Tumor growth inhibition analysis

2528±295	--	--	--
1446±234	57.2	45.5
1218±144	48.2	54.9
938±155	37.1	66.7
2296±511	90.8	9.8
1554±84	61.5	40.8
1321±336	52.3	50.6

Table 60: Tumor growth inhibition analysis

a. Mean ± SEM. b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of BCY6136 and BCY6082 in the MOLP-8 xenograft model was evaluated. The measured body weights and tumor volumes of all treatment groups at various time points are shown in the Figures 32 and 33 and Tables 59 and 60.

The mean tumor size of vehicle treated mice reached 2528 mm³ on day 14. BCY6136 at 1 mg/kg (TV=1146 mm³, TGI=45.5%, p>0.05), 2 mg/kg (TV=1218 mm³, TGI=54.9%, p<0.05) and 3 mg/kg (TV=938 mm³, TGI=66.7%, p<0.01) produced dose-dependent antitumor activity, but all of dosage didn't regress the tumors in MOLP-8 xenografts.

BCY6082 at 1 mg/kg (TV=2296 mm³, TGI=9.8%, p>0.05) and 2 mg/kg (TV=1554 mm³, TGI=40.8%, p>0.05) didn't show obvious anti-tumor activity. BCY6082 at 3 mg/kg inhibited the tumor growth significantly (TV=1321 mm³, TGI=50.6%, p<0.05), but didn't regress the tumors in MOLP-8 xenografts.

In this study, all of mice maintained the bodyweight well.

Study 23: In vivo efficacy test of BCYs in treatment of HT1080 xenograft in BALB/c nude mice (a) Study Objective

The objective of the research was to evaluate the in vivo anti-tumor efficacy of BCYs in treatment of HT1080 xenograft model in BALB/c nude mice.

(b) Experimental Design

1	Vehicle	3	--	10	qw
2	BCY6082	3	2	10	qw
3	BCY6031	3	2	10	qw
4	BCY6173	3	1	10	qw
5	BCY6173	3	2	10	qw
6	BCY6173	3	3	10	qw
7	BCY6135	3	1	10	qw
8	BCY6135	3	2	10	qw
9	BCY6135	3	3	10	qw
10	BCY6033	3	3	10	qw
11	BCY6033	3	5	10	qw
12	BCY6136	3	2	10	qw
13	BCY6136	3	3	10	qw
14	BCY6136	3	5	10	qw
15	BCY6174	3	1	10	qw
16	BCY6174	3	2	10	qw
17	BCY6174	3	3	10	qw
18	BCY6175	3	1	10	qw
19	BCY6175	3	2	10	qw
20	BCY6175	3	3	10	qw
21	ADC	3	3	10	qw

Note: n: animal number; Dosing volume: adjust dosing volume based on body weight 10 µl/g.

(c) Experimental Methods and Procedures (i) Cell Culture

The HT1080 tumor cells will be maintained in medium supplemented with 10% heat inactivated fetal bovine serum at 37°C in an atmosphere of 5% CO₂ in air. The tumor cells will be routinely subcultured twice weekly. The cells growing in an exponential growth phase will be harvested and counted for tumor inoculation.

(ii) Tumor Inoculation

Each mouse will be inoculated subcutaneously at the right flank with HT1080 tumor cells (5*10⁶) for tumor development. The animals will be randomized and treatment will be started when the average tumor volume reaches approximately 150-200 mm³. The test article administration and the animal numbers in each group are shown in the following experimental design table.

(iii) Testing Article Formulation Preparation

Vehicle	--	50 mM Acetate/acetic acid pH5 10%sucrose
BCY6082	0.2	Dilute 160 µl 1 mg/ml BCY6082 stock with 640 µl buffer
BCY6031	0.2	Dilute 180 µl 1 mg/ml BCY6031 stock with 720 µl buffer
BCY6173	1	Dissolve 2.13 mg BCY6173 with 2.04 ml buffer
	0.1	Dilute 90 µl 1 mg/ml BCY6173 stock with 810 µl buffer
	0.2	Dilute 180 µl 1 mg/ml BCY6173 stock with 720 µl buffer
	0.3	Dilute 270 µl 1 mg/ml BCY6173 stock with 630 µl buffer
BCY6135	1	Dissolve 2 mg BCY6135 with 1.9 ml buffer
	0.1	Dilute 90 µl 1 mg/ml BCY6135 stock with 810 µl buffer
	0.2	Dilute 180 µl 1 mg/ml BCY6135 stock with 720 µl buffer
	0.3	Dilute 270 µl 1 mg/ml BCY6135 stock with 630 µl buffer
BCY6033	0.3	Dilute 270 µl 1 mg/ml BCY6033 stock with 630 µl buffer
	0.5	Dilute 450 µl 1 mg/ml BCY6033 stock with 450 µl buffer
BCY6136	0.2	Dilute 200 µl 1 mg/ml BCY6136 stock with 800 µl buffer
	0.3	Dilute 300 µl 1 mg/ml BCY6136 stock with 700 µl buffer
	0.5	Dilute 500 µl 1 mg/ml BCY6136 stock with 500 µl buffer
BCY6174	1	Dissolve 2.69 mg BCY6174 with 2.677 ml buffer
	0.1	Dilute 90 µl 1 mg/ml BCY6174 stock with 810 µl buffer
	0.2	Dilute 180 µl 1 mg/ml BCY6174 stock with 720 µl buffer
	0.3	Dilute 270 µl 1 mg/ml BCY6174 stock with 630 µl buffer
BCY6175	1	Dissolve 2 mg BCY6175 with 1.924 ml buffer
	0.1	Dilute 90 µl 1 mg/ml BCY6175 stock with 810 µl buffer
	0.2	Dilute 180 µl 1 mg/ml BCY6175 stock with 720 µl buffer
	0.3	Dilute 270 µl 1 mg/ml BCY6175 stock with 630 µl buffer
ADC	0.3	Dilute 25.78 µl 10.47 mg/ml ADC stock with 874.22 µl 25 mM Histidine pH 7 10%sucrose

(d) Results (i) Body Weight change and Tumor Growth Curve

Body weight and tumor growth curve are shown in Figures 34 to 42.

(ii) Tumor Volume Trace

Mean tumor volume over time in female Balb/c nude mice bearing HT1080 xenograft is shown in Table 61. Table 61: Tumor volume trace over time

		179±2 2	312±8 4	529±13 5	886±20 7	1185±17 2	1467±22 4	1737±25 8
		177±1 6	183±3 1	99±27	61±17	33±10	12±5	5±3
		177±2 4	215±3 5	133±37	63±31	53±37	45±36	71±67
		178±2 6	276±8	328±73	594±62	745±22	960±53	1074±15 0
		178±2 8	277±6 1	262±12 5	309±23 8	425±334	436±323	480±347
		179±4 3	182±7 1	133±88	87±68	77±65	60±54	47±42
		178±2 2	267±6 6	262±58	436±67	599±89	703±36	871±28
		178±2 3	176±4 8	117±43	70±23	67±23	52±21	62±7
		177±3 9	178±7 9	92±67	62±46	62±51	57±51	44±40
		178±2 6	186±3 4	79±30	29±15	12±8	6±4	9±7
		178±3 6	117±2 0	41±10	12±4	6±2	4±0	0±0
		178±1 9	249±2 2	115±8	126±53	158±71	140±89	245±116
		178±3 6	168±2 1	72±18	22±7	21±15	8±6	3±2
		178±2 6	165±3 3	52±10	18±7	9±4	5±2	2±1
		180±3 5	231±1 9	226±29	432±37	602±63	742±62	1066±13 0
		178±3 1	203±5 0	123±29	216±47	291±40	326±68	532±91
		178±3 3	195±1 3	110±39	58±23	34±17	21±11	11±7
		178±2 7	248±6 2	244±74	347±18	435±18	558±38	769±26
		178±2 2	223±4 2	158±59	116±35	156±52	166±51	295±88
		179±3 9	189±4 8	116±50	43±18	33±18	25±13	11±9
		180±2 6	158±3 0	58±8	18±2	7±1	2±2	0±0

(iii) Tumor Growth Inhibition Analysis

Tumor growth inhibition rate for BCYs in the HT1080 xenograft model was calculated based on tumor volume measurements at day 14 after the start of treatment. Table 62: Tumor growth inhibition analysis

1737±258	--	--	--
5±3	0.3	111.1
71±67	4.1	106.8
1074±150	61.8	42.5
480±347	27.6	80.6
47±42	2.7	108.4
871±28	50.1	55.5
62±7	3.5	107.5
44±40	2.5	108.6
9±7	0.5	110.8
0±0	0.0	111.4
245±116	14.1	95.7
3±2	0.2	111.2
2±1	0.1	111.3
1066±130	61.4	43.1
532±91	30.6	77.3
11±7	0.6	110.7
769±26	44.3	62.1
295±88	17.0	92.5
11±9	0.6	110.8
0±0	0.0	111.5	-

Table 62: Tumor growth inhibition analysis

a. Mean ± SEM. b. Tumor Growth Inhibition is calculated by dividing the group average tumor volume for the treated group by the group average tumor volume for the control group (T/C).

(e) Results Summary and Discussion

In this study, the therapeutic efficacy of BCYs in the HT1080 xenograft model was evaluated. The measured body weights and tumor volumes of all treatment groups at various time points are shown in the Figures 34 to 42 and Tables 61 and 62.

The mean tumor size of vehicle treated mice reached 1737 mm³ on day 14.

BCY6082 at 2 mg/kg, qw (TV=5 mm³, TGI=111.1%, p<0.01) and BCY6031 at 2 mg/kg qw (TV=7 mm³, TGI=106.8%, p<0.01) showed potent anti-tumor activity.

BCY6173 at 1 mg/kg, qw (TV=1074 mm³, TGI=42.5%, p>0.05), 2 mg/kg, qw (TV=480 mm³, TGI=80.6%, p<0.05) and 3 mg/kg, qw (TV=7 mm³, TGI=108.4%, p<0.01) produced dose-dependent antitumor activity.

BCY6135 at 1 mg/kg, qw (TV=871 mm³, TGI=55.5%, p<0.01), 2 mg/kg, qw (TV=62 mm³, TGI=107.5%, p<0.001) and 3 mg/kg, qw (TV=44 mm³, TGI=108.6%, p<0.001) produced dose-dependent antitumor activity.

BCY6033 at 3 mg/kg, qw (TV=9 mm³, TGI=110.8%, p<0.001) and 5 mg/kg, qw (TV=0 mm³, TGI=111.4%, p<0.001) showed potent anti-tumor activity, and completely eradicated the tumors by day 14 at 5 mg/kg.

BCY6136 at 2 mg/kg, qw (TV=345 mm³, TGI=95.7%, p<0.001), 3 mg/kg, qw (TV=3 mm³, TGI=111.2%, p<0.001) and 5 mg/kg, qw (TV=2 mm³, TGI=111.3%, p<0.001) showed potent anti-tumor activity.

BCY6174 at 1 mg/kg, qw (TV=1066 mm³, TGI=43.1 %, p<0.05), 2 mg/kg, qw (TV=532 mm³, TGI=77.3%, p<0.01) and 3 mg/kg, qw (TV=11 mm³, TGI=110.7%, p<0.001) produced dose-dependent antitumor activity.

BCY6175 at 1 mg/kg, qw (TV=769 mm³, TGI=62.1%, p<0.01), 2 mg/kg, qw (TV=295 mm³, TGI=92.5%, p<0.001) and 3 mg/kg, qw (TV=11 mm³, TGI=110.8%, p<0.001) produced dose-dependent antitumor activity.

ADC at 3 mg/kg, qw (TV=0 mm³, TGI=111.5%) completely eradicated the tumors by day 14.

Reference Study 24: Investigation of Association between Copy Number Variation (CNV) and gene expression for EphA2 from multiple tumour types Methods

1. Select all studies in cBioPortal (http://www.cbioportal.org/) and search for EPHA2.

1. (a) Remove provisional studies.
2. (b) Deselect studies with overlapping samples to prevent sample bias (based on warning in cBioPortal)- always keep PanCancer study if this is an option.
3. (c) Studies selected for analysis (Table 63).

Table 63: Studies analysed from cBioPortal and units in study

Breast Invasive Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Lung Squamous Cell Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Kidney Renal Papillary Cell Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Kidney Renal Clear Cell Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Colon Adenocarcinoma (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Head and Neck Squamous Cell Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Bladder Urothelial Carcinoma (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Uveal Melanoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Lung Adenocarcinoma (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Ovarian Serous Cystadenocarcinoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Breast Cancer (METABRIC, Nature 2012 & Nat Commun 2016)	mRNA expression (microarray)
Mesothelioma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Colorectal Adenocarcinoma (TCGA, Nature 2012)	RNA Seq RPKM
Cervical Squamous Cell Carcinoma (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Sarcoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Cancer Cell Line Encyclopedia (Novartis/Broad, Nature 2012)	mRNA expression (microarray)
Rectum Adenocarcinoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Liver Hepatocellular Carcinoma (TCGA, PanCancer Atlas)	EPHA2: mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Stomach Adenocarcinoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Uterine Corpus Endometrial Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Skin Cutaneous Melanoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Prostate Adenocarcinoma (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Kidney Chromophobe (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Pediatric Wilms' Tumor (TARGET, 2018)	Epha2: mRNA expression (RNA-Seq RPKM)
Pheochromocytoma and Paraganglioma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Thyroid Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Esophageal Adenocarcinoma (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Cholangiocarcinoma (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Brain Lower Grade Glioma (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Thymoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Pediatric Acute Lymphoid Leukemia - Phase II (TARGET, 2018)	Epha2: mRNA expression (RNA-Seq RPKM)
Diffuse Large B-Cell Lymphoma (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Glioblastoma Multiforme (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Metastatic Prostate Cancer, SU2C/PCF Dream Team (Robinson et al., Cell 2015)	mRNA expression / capture (RNA Seq RPKM)
Acute Myeloid Leukemia (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Testicular Germ Cell Tumors (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Adrenocortical Carcinoma (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNASeqV2)
Uterine Carcinosarcoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Pancreatic Adenocarcinoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/Merged from Illumina HiSeq_RNASeqV2 syn4976369
Prostate Adenocarcinoma (MSKCC, Cancer Cell 2010)	mRNA Expression
Prostate Adenocarcinoma (Fred Hutchinson CRC,Nat Med 2016)	mRNA Expression

2. Export CNV and RNA expression data from cBioPortal. 3. Test if CNVs are statistically significantly associated with changes in mRNA expression for EphA2 (log2 not applied).

1. (a) Run non-parametric Kruskal-Wallis test in GraphPad Prism (7.04) and R/R studio (threshold for significance: p<0.01).
   1. (i) GraphPad Prism: set up column table, run non-parametric test with no matching or pairing and do not assume Gaussian distribution.
   2. (ii) Packages used in R:
      1. 1. XLConnect
      2. 2. dplyr
      3. 3. Kruskal-Wallis Rank Sum Test: Kruskal.test.

4. Adjust for multiple comparisons (include all possible comparisons even if n=1 within a group) in R/Rstudio using Dunn's test (threshold for significance: p<0.025).

1. (a) dunn.test with multiple comparison method= "bonferonni".

Results

The results are shown in Table 64 below. Across 41 publicly available datasets compiled in cBioPortal that report both Copy Number Variation (CNV) and mRNA gene expression for EphA2, there are numerous cancer types where cases have been reported with EphA2 shallow-deletions (<2 copies). Although less common, in these same cancer types a subset of tumors harbored EphA2 deep deletions (>1 copy loss or biallelic loss), EphA2 gains (2-3 copies) or EphA2 amplifications (>3 copies). Indications where >33% of tumors had either shallow-deletions or deep deletions in EphA2 included: kidney chromophobe, cholangiocarcinoma, pheochromocytoma and paraganglioma, lung squamous cancer, breast, rectum, brain lower grade glioma, liver, adrenocortical carcinoma, mesothelioma, esophageal adenocarcinoma and colon cancer. In contrast, there were no studies where >33% of samples had either gains or amplification in EphA2. Taken together these results demonstrate that deletions in EphA2 DNA are found across a variety of indications.

Approximately one third of all samples analyzed in the 41 studies harbored EphA2 CNVs. Based on this high percentage of CNVs across studies, and the high percentage of shallow deletions within specific tumor types, statistical testing was performed to identify possible associations between copy number changes and RNA expression. Tumors per indication were allocated to 1 of 5 classes:

1. a) Deep deletion;
2. b) Shallow deletion;
3. c) Diploid;
4. d) Gain; or
5. e) Amplification.

Kruskall-Wallis testing was then performed to detect if the distributions of mRNA expression values per classes differed between classes (P < 0.01). For those TCGA data sets with P < 0.01 and to identify which classes were different to one another post-hoc testing was performed by calculating Z-statistics with adjusted P-values calculated (Bonferroni). For simplicity of interpretation pair-wise comparisons vs. diploid per indication were reviewed (although all pair-wise P-values were calculated). 19/41 of these studies had a Kruskall-Wallis p-value of <0.01 demonstrating that copy number is statistically significantly associated with RNA expression. Of these 19 studies, 17 of them had a Bonferroni adjusted P < 0.025 for Diploid vs. Shallow Deletion indicating an association of decreased EphA2 mRNA expression with decreased EphA2 copy number. Only 2 of these 19 studies had a Bonferroni adjusted P < 0.025 for Diploid vs. Gain and both were breast cancer studies. Furthermore, one of these breast cancer studies (Breast Invasive Carcinoma (TCGA, PanCancer Atlas)) had a Bonferroni adjusted P<0.025 for both Diploid vs. Shallow Deletion and Diploid vs. Gain suggesting that copy number alterations may have a strong impact on EphA2 RNA expression in breast cancer.

The central dogma of genetics suggests that reduced copy number in EphA2 lead to reduced RNA and protein expression. Therefore, the observed associations between copy number loss of EphA2 and reduced mRNA expression in a variety of tumor types suggest that EphA2 protein expression may also be reduced. Similarly, copy number gains of EphA2 in breast cancer that were associated with increased mRNA expression may also suggest increased EphA2 protein expression. Moreover, higher EphA2 protein expression (measured by FACS) is associated with increased efficacy of certain EphA2 bicyclic drug conjugates of the invention (measured by tumor volume) in preclinical in vivo models. Taken together if copy number alterations that are associated with mRNA expression changes do predict protein expression levels then patients with tumors containing copy number deletions of EphA2 may be less likely to respond to EphA2 bicyclic drug conjugates of the invention. Similarly, if patients with tumor copy number gains in EphA2 (e.g. breast cancer) it is possible that these patients would be more likely to respond to EphA2 bicyclic drug conjugates of the invention. Therefore, if patients were stratified by EphA2 copy number status, then this information could be used to both exclude and select patients for treatment with EphA2 bicyclic drug conjugates of the invention to increase efficacy. Table 64: Results of Investigation of Association between Copy Number Variation (CNV) and gene expression for EphA2

Breast Invasive Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	5	415	511	61	2	80.816	< 2.2e-16	- 4.6031 80 (0.0000 )*
										0.1761 18 (1.0000 )	6.4605 80 (0.0000 )*	0.7139 78 (1.0000 )
Lung Squamous Cell Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	3	207	201	55	0	52.942	1.89E-11	-	6.7865 01 (0.0000 )*	-	N/A
									1.5846 10 (0.3392 )		0.0196 07 (1.0000 )
Kidney Renal Papillary Cell Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	1	48	224	0	1	42.161	3.71E-09	- 1.5862 07 (0.3381 )	N/A
											6.0973 75 (0.0000 )*	1.5491 07 (0.3641 )
Kidney Renal Clear Cell Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	0	69	278	5	0	38.342	4.72E-09	N/A	- 0.4870 59 (0.9393 )	N/A
												6.1332 19 (0.0000 )*
Colon Adenocarcinom a (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	3	132	245	8	0	35.397	1.00E-07	- 2.1581 94 (0.0927 )	N/A
											5.6706 00 (0.0000 )*	0.7810 46 (1.0000 )
Head and Neck Squamous Cell Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	3	86	345	54	0	32.72	3.69E-07	- 2.4449 14 (0.0435 )	- 1.5306 70 (0.3776 )	N/A
												4.6807 89 (0.0000 )*
Bladder Urothelial Carcinoma (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	0	73	245	80	4	28.906	2.34E-06	N/A
										5.2032 51 (0.0000 )*	0.2117 44 (1.0000 )	0.5817 04 (1.0000 )
Uveal Melanoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	0	24	56	0	0	21.051	4.47E-06	N/A	4.5880 95 (0.0000 )*	N/A	N/A
Lung Adenocarcinom a (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	1	115	263	121	3	28.874	8.29E-06	- 0.6904 60 (1.0000 )	- 0.6267 07 (1.0000 )
											4.2801 00 (0.0001 )*	2.2764 58 (0.1141 )
Ovarian Serous Cystadenocarci noma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	0	59	78	60	4	25.349	1.31 E-05	N/A	- 0.2392 49 (1.0000 )
											4.3900 97 (0.0000 )*	0.2405 43 (1.0000 )
Breast Cancer (METABRIC, Nature 2012 & Nat Commun 2016)	mRNA expression (microarray)	1	491	1349	25	0	23.875	2.65E-05	- 4.1152 88 (0.0001 )*	N/A
										0.5689 37 (1.0000 )	2.2745 64 (0.0688 )
Mesothelioma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	0	29	50	3	0	18.866	8.00E-05	N/A	N/A
											4.3194 25 (0.0000 )*	0.1704 78 (1.0000 )
Colorectal Adenocarcinom a (TCGA, Nature 2012)	RNA Seq RPKM	0	53	138	2	0	18.847	8.08E-05	N/A	- 0.3389 75 (1.0000 )	N/A
												4.2980 92 (0.0000 )*
Cervical Squamous Cell Carcinoma (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	1	31	167	76	0	19.435	2.22E-04	- 1.6182 48 (0.3168 )	- 1.4463 39 (0.4442 )	N/A
												3.4296 09 (0.0018 )*
Sarcoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	0	43	113	70	4	19.389	2.27E-04	N/A	- 0.8524 54 (1.0000 )
											3.6669 49 (0.0007 )*	0.9530 27 (1.0000 )
Cancer Cell Line Encyclopedia (Novartis/Broad, Nature 2012)	mRNA expression (microarray)	17	279	418	150	13	20.977	0.00032	- 2.0848 79 (0.1854 )	- 3.6159 35 (0.0015 )*	- 2.0070 04 (0.2237 )	- 0.1088 80 (1.0000 )
Rectum Adenocarcinom a (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	1	54	78	3	0	18.215	0.00039 71	- 1.9265 19 (0.1621 )	N/A
											3.8771 66 (0.0003 )*	1.1674 00 (0.7291 )
Liver Hepatocellular Carcinoma (TCGA, PanCancer Atlas)	EPHA2: mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	1	130	194	21	2	15.514	0.00374 5	0.3023 41 (1.0000 )	3.6972 48 (0.0011 )*	- 0.3366 59 (1.0000 )
												0.4544 54 (1.0000 )
Stomach Adenocarcinom a (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	2	90	264	44	7	13.966	0.00740 4	- 2.0729 78 (0.1909 )	- 1.7504 66 (0.4002 )
											1.6060 72 (0.5413 )	1.6028 06 (0.5449 )
Uterine Corpus Endometrial Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	3	61	395	43	5	12.916	0.0117	- 1.9058 63 (0.2833 )	- 1.5973 83 (0.5509 )
											1.0393 07 (1.0000 )	2.2687 98 (0.1164 )
Skin Cutaneous Melanoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	2	70	216	72	3	12.242	0.01564
									1.0945 26 (1.0000 )	2.6744 93 (0.0374 )	0.0959 66 (1.0000 )	1.6926 28 (0.4526 )
Prostate Adenocarcinom a (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	0	44	438	4	1	10.112	0.01764	N/A	- 0.0827 90 (1.0000 )
											2.9055 02 (0.0110 )*	1.3746 09 (0.5078 )
Kidney Chromophobe (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	0	52	12	1	0	7.8781	0.01947	N/A	N/A
											2.4983 40 (0.0187 )*	1.8631 69 (0.0937 )
Pediatric Wilms' Tumor (TARGET, 2018)	Epha2: mRNA expression (RNA-Seq RPKM)	0	22	74	5	0	7.4912	0.02362	N/A	- 0.1732 74 (1.0000 )	N/A
												2.6907 66 (0.0107 )*
Pheochromocyt oma and Paraganglioma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	4	96	60	1	0	8.8074	0.03196	- 1.4115 67 (0.4742 )	N/A
											2.2013 44 (0.0831 )	1.9461 34 (0.1549 )
Thyroid Carcinoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	0	4	474	2	0	5.1773	0.08	N/A	N/A
											2.2218 84 (0.0394 )	0.5035 77 (0.9218 )
Esophageal Adenocarcinom a (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	1	64	83	32	1	7.6886	0.1037	- 1.4626 79 (0.7178 )	- 1.6823 11 (0.4625 )	- 0.3622 98 (1.0000 )
												0.9109 90 (1.0000 )
Cholangiocarcin oma (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	2	27	7	0	0	4.1691	0.1244	- 2.0378 40 (0.0623 )	N/A	N/A
												0.9721 00 (0.4965 )
Brain Lower Grade Glioma (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	0	191	303	13	0	4.0473	0.1322	N/A	- 1.7715 14 (0.1147 )	N/A
												0.7223 83 (0.7051 )
Thymoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	0	8	110	1	0	4.0322	1.33E-01	N/A	N/A
											1.9823 34 (0.0712 )	0.3691 15 (1.0000 )
Pediatric Acute Lymphoid Leukemia - Phase II (TARGET, 2018)	Epha2: mRNA expression (RNA-Seq RPKM)	1	6	70	4	0	5.5309	0.1368	- 0.8051 00 (1.0000 )	N/A
											1.4374 04 (0.4518 )	1.6075 86 (0.3238 )
Diffuse Large B-Cell Lymphoma (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	0	4	33	0	0	1.744	0.1866	N/A	1.3206 13 (0.0933 )	N/A	N/A
Glioblastoma Multiforme (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	0	13	104	28	0	2.9376	0.2302	N/A	- 0.7161 10 (0.7109 )	N/A
												1.4287 78 (0.2296 )
	mRNA expression / capture (RNA Seq RPKM)	2	21	87	7	0	4.069	0.254	- 1.8126 13 (0.2097 )	N/A
											0.9925 71 (0.9628 )	0.3140 89 (1.0000 )
Acute Myeloid Leukemia (TCGA, PanCancer Atlas)	mRNA Expression, RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	0	1	160	4	0	2.4016	0.301	N/A	- 1.5391 42 (0.1857 )	- 0.1995 32 (1.0000 )	N/A
Testicular Germ Cell Tumors (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	1	29	92	22	0	3.3144	0.3456	- 0.4431 10 (1.0000 )	- 1.7511 61 (0.2398 )	N/A
												0.5748 46 (1.0000 )
Adrenocortical Carcinoma (TCGA, PanCancer Atlas)	RSEM (Batch normalized from Illumina HiSeq_RNAS eqV2)	0	28	47	1	0	2.0003	0.3678	N/A	N/A
											1.3463 97 (0.2673 )	0.5501 03 (0.8734 )
Uterine Carcinosarcoma (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	0	16	22	16	2	2.44	0.4862	N/A	- 0.5502 92 (1.0000 )
											0.4760 71 (1.0000 )	1.2151 02 (0.6730 )
Pancreatic Adenocarcinom a (TCGA, PanCancer Atlas)	mRNA Expression Batch Normalized/ Merged from Illumina HiSeq_RNAS eqV2 syn4976369	2	50	106	9	1	3.3833	4.96E-01	- 1.1950 82 (1.0000 )	- 0.6025 58 (1.0000 )
											0.1594 42 (1.0000 )	1.2176 97 (1.0000 )
mRNA Expression	0	5	77	3	0	1.3139	0.5184	N/A	- 0.4065 79 (1.0000 )	- 1.0899 48 (0.4136 )	N/A
	mRNA expression	0	39	84	10	0	0.0283 51	0.9859	N/A	N/A
											0.1604 04 (1.0000 )	0.0797 85 (1.0000 )

Claims (10)

1. A compound, which compound is BCY6136 or a pharmaceutically acceptable salt thereof, wherein said compound BCY6136 has the structure:

   wherein BCY6099 is a polypeptide of SEQ ID NO: 2 (β-Ala)-Sar₁₀-A(HArg)D-C_i(HyP)LVNPLC_iiLHP(D-Asp)W(HArg)C_iii (SEQ ID NO: 2)

   wherein Sar is sarcosine, HArg is homoarginine and HyP is hydroxyproline;

   wherein the polypeptide of SEQ ID NO: 2 is cyclised at C_i, C_ii and C_iii with 1,1',1"-(1,3,5-triazinane-1,3,5-triyl)triprop-2-en-1-one (TATA).
2. A compound according to claim 1, wherein SEQ ID NO: 2 is amidated at the C-terminus.
3. A compound according to claim 1 or 2, wherein the pharmaceutically acceptable salt is selected from the free acid or the sodium, potassium, calcium, or ammonium salt.
4. A pharmaceutical composition which comprises the compound of any one of claims 1 to 3, in combination with one or more pharmaceutically acceptable excipients..
5. A compound according to any one of claims 1 to 3, or a pharmaceutical composition according to claim 4, for use in preventing, suppressing or treating a disease or disorder characterised by overexpression of EphA2 in diseased tissue.
6. A compound according to any one of claims 1 to 3, or a pharmaceutical composition according to claim 4, for use in a method of preventing, suppressing or treating cancer.
7. A compound for use or a pharmaceutical composition for use according to claim 5, wherein the disease or disorder is cancer.
8. A compound for use or a pharmaceutical composition for use according to claim 6 or 7, wherein the cancer is selected from prostate cancer, lung cancer, breast cancer, gastric cancer, ovarian cancer, oesophageal cancer, multiple myeloma and fibrosarcoma.
9. A compound for use or a pharmaceutical composition for use according to claim 8, wherein the lung cancer is non-small cell lung carcinomas (NSCLC) and/or wherein the breast cancer is triple negative breast cancer
10. A compound according to any one of claims 1 to 3, or a pharmaceutical composition according to claim 4, for use in a method of preventing, suppressing or treating cancer in a patient in need thereof, wherein said patient is identified as having an increased copy number variation (CNV) of EphA2.