WO2020170330A1 - 光線力学的療法条件パラメータの決定方法および光線力学的療法装置 - Google Patents
光線力学的療法条件パラメータの決定方法および光線力学的療法装置 Download PDFInfo
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- A61N5/00—Radiation therapy
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- A61N5/0613—Apparatus adapted for a specific treatment
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- A61K41/0057—Photodynamic therapy with a photosensitizer, i.e. agent able to produce reactive oxygen species upon exposure to light or radiation, e.g. UV or visible light; photocleavage of nucleic acids with an agent
- A61K41/0061—5-aminolevulinic acid-based PDT: 5-ALA-PDT involving porphyrins or precursors of protoporphyrins generated in vivo from 5-ALA
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- A—HUMAN NECESSITIES
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- A61K41/0071—PDT with porphyrins having exactly 20 ring atoms, i.e. based on the non-expanded tetrapyrrolic ring system, e.g. bacteriochlorin, chlorin-e6, or phthalocyanines
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Definitions
- the present invention relates to photodynamic therapy using 5-aminolevulinic acids.
- Photodynamic therapy is a light beam that corresponds to the absorption band wavelength of a photosensitizer by administering a photosensitizer or its precursor and accumulating it on the affected area such as tumor tissue, new blood vessels, or skin surface.
- a treatment method utilizing the cell killing effect of reactive oxygen species including singlet oxygen generated by excitation.
- Aminolevulinic acid (5-aminoleuvic acid: 5-ALA) is a substance having oral absorbability, and is metabolized to protoporphyrin IX (PpIX) during the process of heme biosynthesis in intracellular mitochondria.
- PpIX has an absorption band near 410 nm called the Soret band and an absorption band near 500-650 nm called the Q band, and is a photosensitizer that generates active oxygen species by irradiating with light of these absorption band wavelengths. Used for.
- Patent Document 1 Intracellular accumulation of PpIX biosynthesized from 5-ALA in Patent Document 1 increases depending on the concentration of 5-ALA, and sensitivity of cells to light irradiation increases, that is, cells. Have been shown to be more likely to die. It is also known in the art that, in addition to the intracellular PpIX accumulation amount, the effect of PDT depends on the light irradiation energy density, which is the integrated value of the light illuminance and the irradiation time (Patent Document 2).
- Patent Documents 3 and 4 and Non-Patent Document 1 are related to PDT, they do not disclose any strict relationship between the intracellular PpIX accumulation amount and the light irradiation energy density with respect to the cytocidal effect in PDT.
- An object of the present invention is to provide a method for determining a photodynamic therapy condition parameter that optimizes the photodynamic therapy by accurately determining the photodynamic therapy condition parameter.
- Another object of the present invention is to provide a photodynamic therapy device using such a method for determining photodynamic therapy condition parameters.
- the present invention is a method for determining the condition parameter of photodynamic therapy, which comprises irradiating intracellularly accumulated protoporphyrin IX with light after administration of 5-aminolevulinic acid, A step of calculating a regression curve showing a correlation between three condition parameters of cell viability (Y), intracellular protoporphyrin IX accumulated amount (X) and light irradiation energy density (P) by the processor in an experimental stage; , Before the treatment is started, the processor preselects two condition parameters of cell viability (Y), intracellular protoporphyrin IX accumulation amount (X), and light irradiation energy density (P), and the regression curve is used. And determining the remaining condition parameters.
- the photodynamic therapy apparatus comprises a light source for irradiating the protoporphyrin IX accumulated in cells with light after administering 5-aminolevulinic acids.
- a light quantity control unit for controlling the light irradiation energy density (P)
- a data input section for inputting data
- a processor to calculate the data A data storage unit for recording data,
- the processor calculates a regression curve showing a correlation between three condition parameters of cell viability (Y), intracellular protoporphyrin IX accumulation amount (X) and light irradiation energy density (P), Prior to the initiation of treatment, two conditional parameters of cell viability (Y), intracellular protoporphyrin IX accumulated amount (X) and light irradiation energy density (P) were preselected, and the remaining curve was calculated using the regression curve. Determine the condition parameters.
- the cell preferably has a protoporphyrin IX accumulating disease selected from the group consisting of leukemia, tumor, cancer, viral infection, skin disease, eye disease, autoimmune disease and graft-versus-host disease (GVHD). ..
- the present invention also relates to a photodynamic therapy composition containing 5-aminolevulinic acid having a dose corresponding to the intracellular protoporphyrin IX accumulated amount (X) determined by the method for determining the photodynamic therapy condition parameter. ..
- the present invention also relates to a method for determining light irradiation conditions in photodynamic therapy, which comprises inactivating a cell in which protoporphyrin IX has accumulated by irradiating with light after administering 5-aminolevulinic acid to a subject. , Measuring the accumulated amount of protoporphyrin IX in the cells removed from the subject by the processor; Determining the irradiation energy density by a processor using a predetermined relational expression based on the accumulated amount of protoporphyrin IX measured in the above step.
- the above-mentioned relational expression is based on a regression curve that represents a correlation between three condition parameters that are calculated in advance, such as cell viability (Y), intracellular protoporphyrin IX accumulation amount (X), and light irradiation energy density (P). It is preferably defined.
- the above relational expression preferably includes a look-up table showing the relation between the accumulated amount of protoporphyrin IX (X) and the light irradiation energy density (P).
- the method for determining the condition parameter of the photodynamic therapy After the treatment using the conditional parameter determined by using the regression curve by the processor, the cell viability of the subject is measured, and the intracellular protoporphyrin IX accumulation amount is calculated based on the obtained cell viability.
- the step of estimating Preferably, the processor further resets the light irradiation energy density and the 5-aminolevulinic acid dose using the estimated intracellular protoporphyrin IX accumulation amount before starting the next treatment.
- 5-aminolevulinic acid includes 5-aminolevulinic acid (ALA) or a derivative thereof, or a salt thereof.
- various administration forms such as intravenous injection, infusion, oral administration, transdermal administration, suppository, and intravesical injection can be adopted.
- the problem with photodynamic therapy is that excessive light irradiation kills normal cells and leads to increased side effects, while under-exposure irradiation cannot sufficiently kill target cells. Therefore, by applying the regression analysis results according to the present invention, the light irradiation energy density or the photosensitizer dose for appropriately inducing cell death is calculated from the intracellular protoporphyrin IX accumulation amount of the target cells of the disease to be treated (leukemia, etc.). Can be determined.
- the cancer cell population exceeding the effective protoporphyrin IX accumulation amount was calculated and finally the clinical effect was achieved It is possible to estimate the irradiation amount, the number of times, etc.
- FIG. 1 is a block diagram showing an example of a photodynamic therapy apparatus according to the present invention.
- the photodynamic therapy apparatus includes a light source 20, a light quantity control unit 21, a processor 10 for calculating data, a data input unit 11 for inputting data, a data storage unit 12 for storing data, and data for outputting data.
- the output unit 13 and the like are included.
- the light source 20 has a function of irradiating the subject with 5-aminolevulinic acids (ALAs) and then irradiating the protoporphyrin IX (PpIX) accumulated in the cells with light.
- the wavelength of light is set to the absorption wavelength of PpIX, for example, 410 nm, 545 nm, 580 nm, 630 nm.
- the light quantity control unit 21 controls the light irradiation energy density (P) of the light emitted from the light source 20.
- the processor 10 controls the entire device, processes data, etc. according to a preset program.
- the data input unit 11 includes a keyboard, a touch panel, a manual input device such as a mouse, or a remote input device by wired communication or wireless communication.
- the data storage unit 12 is composed of a semiconductor memory, a hard disk, an optical disk, or the like.
- the data output unit 13 is composed of a display, a printer and the like.
- FIG. 2 is a flowchart showing an example of a method for determining a photodynamic therapy condition parameter according to the present invention.
- step s1 in the experimental stage, ALAs having various doses are administered to a subject, and then the amount of PpIX accumulated in cells is measured.
- the measuring method for example, a high performance liquid chromatography method using fluorescence detection, a flow cytometer, or the like can be used.
- the measured intracellular PpIX accumulation amount is input via the data input unit 11 and stored in the data storage unit 12.
- step s2 cells having various accumulated amounts of PpIX are irradiated with light at various light irradiation energy densities (joule per unit area), and the survival rate of each cell is measured.
- the various light irradiation energy densities used and the measured individual cell viability are input via the data input unit 11 and stored in the data storage unit 12.
- the processor 10 uses three statistical parameters according to predetermined statistical analysis software, that is, the cell viability (Y), the intracellular PpIX accumulation amount (X), and the light irradiation energy density (P) stored in the data storage unit 12. Is subjected to regression analysis and fitting, and a regression curve showing the correlation between the condition parameters is calculated.
- model formula (1) Although an arbitrary model formula can be assumed for the regression curve, it is preferable to represent it by the following model formula (1) using four parameters A to D.
- the calculated regression curve and the parameters A to D that define the regression curve can be stored in the data storage unit 12 and displayed on the data output unit 13.
- step s3 two condition parameters of cell viability (Y), intracellular PpIX accumulation amount (X) and light irradiation energy density (P) are set via the data input unit 11 before the start of treatment.
- the processor 10 preliminarily selects and uses the regression curve stored in the data storage unit 12 to determine the remaining condition parameters.
- the two preselected condition parameters and the determined condition parameters can be stored in the data storage unit 12 and displayed on the data output unit 13.
- the light irradiation may be performed not only once but also twice or more. In that case, the total energy density of each irradiation is the light irradiation energy density (P).
- the light irradiation energy density (P) can be determined using the regression curve.
- the determined light irradiation energy density (P) is supplied to the light amount control unit 21, and controls the irradiation amount of the light emitted from the light source 20 and the irradiation frequency.
- the intracellular PpIX accumulation amount (X) can be determined using the regression curve.
- a photodynamic therapy composition containing 5-aminolevulinic acid having a dose corresponding to the intracellular PpIX accumulation amount (X) thus determined can be produced.
- the cell survival rate (Y) can be determined using the regression curve.
- ATL human adult T-cell leukemia
- C8166 HTLV-1 transformed cell line
- PpIX protoporphyrin IX
- the photodynamic therapy apparatus refers to a pre-programmed regression curve from input values or a look-up table having a stepwise range derived from the regression curve, and refers to a light irradiation energy density corresponding to a treatment target value. Determine (P) and administer treatment.
- the intracellular PpIX accumulation amount, the therapeutic target value of the cell killing effect, and the light irradiation energy density may be continuous values or stepwise values.
- the intracellular PpIX accumulation amount (X) of the treatment target is measured, and this value is input to the photodynamic therapy device.
- Cell survival rate for any light irradiation energy density (P) by referring to a regression curve programmed in advance from the input intracellular PpIX accumulation amount or a lookup table having a stepwise range derived from the regression curve (Y) can be calculated, and the treatment effect is predicted and the treatment is performed.
- the intracellular PpIX accumulation amount, light irradiation energy density, and cell survival rate may be continuous values or stepwise values.
- the patient's cells are treated after performing one or more photodynamic therapy on the patient. Measure the survival rate. From the light irradiation energy density and cell survival rate at that time, the intracellular PpIX accumulation amount (X) or the range of the accumulation amount of the patient cancer cells is calculated based on the regression curve programmed in the photodynamic therapy apparatus.
- conditional parameters for example, light irradiation energy density
- the intracellular PpIX accumulation amount (X) or the range of the accumulation amount of the patient cancer cells is calculated based on the regression curve programmed in the photodynamic therapy apparatus.
- the medical staff obtains the light irradiation energy density (P) in order to obtain the target therapeutic effect when performing the next photodynamic treatment.
- the 5-ALA dose can be reset based on a regression curve programmed into the photodynamic therapy device.
- the present invention is extremely useful industrially in that photodynamic therapy can be optimized.
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Abstract
Description
プロセッサによって、実験段階において、細胞生存率(Y)、細胞内プロトポルフィリンIX蓄積量(X)および光照射エネルギー密度(P)の3つの条件パラメータ間の相関関係を表す回帰曲線を算出するステップと、
プロセッサによって、治療開始前に、細胞生存率(Y)、細胞内プロトポルフィリンIX蓄積量(X)および光照射エネルギー密度(P)のうちの2つの条件パラメータを予め選択し、前記回帰曲線を用いて残りの条件パラメータを決定するステップと、を含む。
光照射エネルギー密度(P)を制御する光量制御部と、
データを入力するデータ入力部と、
データを演算するプロセッサと、
データを記録するデータ記憶部と、を備え、
前記プロセッサは、実験段階において、細胞生存率(Y)、細胞内プロトポルフィリンIX蓄積量(X)および光照射エネルギー密度(P)の3つの条件パラメータ間の相関関係を表す回帰曲線を算出し、
治療開始前に、細胞生存率(Y)、細胞内プロトポルフィリンIX蓄積量(X)および光照射エネルギー密度(P)のうちの2つの条件パラメータを予め選択し、前記回帰曲線を用いて残りの条件パラメータを決定する。
Y=(A-D)/(1+(X/C)^B)+D
プロセッサによって、上記被検体から取り出した細胞におけるプロトポルフィリンIXの蓄積量を測定するステップと、
プロセッサによって、上記ステップにて測定されたプロトポルフィリンIXの蓄積量に基づき、予め定められた関係式を使用して光照射エネルギー密度を決定するステップと、を含む。
プロセッサによって、前記回帰曲線を用いて決定された条件パラメータを用いた治療を実施した後に、被検体の細胞生存率を計測し、得られた細胞生存率に基づいて細胞内プロトポルフィリンIX蓄積量を推定するステップと、
プロセッサによって、次の治療開始前に、推定した細胞内プロトポルフィリンIX蓄積量を用いて、光照射エネルギー密度および5-アミノレブリン酸類投与量を再設定するステップと、をさらに含むことが好ましい。
がん患者が5-ALA類を服用した後、患者がん細胞内に蓄積したPpIX蓄積量(X)を測定し、この細胞内PpIX蓄積量と殺細胞効果の治療目標値(細胞生存率(Y)に対応)を光線力学的療法装置に入力する。光線力学的療法装置は、入力された値からあらかじめプログラムされた回帰曲線、あるいは回帰曲線から導かれた段階的なレンジを有するルックアップテーブルを参照して、治療目標値に対応する光照射エネルギー密度(P)を決定し、治療を実施する。このとき、細胞内PpIX蓄積量、殺細胞効果の治療目標値、光照射エネルギー密度は連続的な値であっても段階的な値であってもよい。
治療対象の細胞内PpIX蓄積量(X)を測定し、この値を光線力学的療法装置に入力する。入力された細胞内PpIX蓄積量からあらかじめプログラムされた回帰曲線、あるいは回帰曲線から導かれた段階的なレンジを有するルックアップテーブルを参照して、任意の光照射エネルギー密度(P)に対する細胞生存率(Y)を算出することができ、治療効果予測や治療実施を行う。細胞内PpIX蓄積量、光照射エネルギー密度、細胞生存率は連続的な値であっても段階的な値であってもよい。
上述した回帰曲線またはルックアップテーブルを用いて決定された条件パラメータ(例えば、光照射エネルギー密度)を用いて、患者に対して1回あるいは複数回の光線力学的療法を実施した後に、患者の細胞生存率を計測する。そのときの光照射エネルギー密度と細胞生存率から、光線力学的療法装置にプログラムされた回帰曲線に基づき、患者がん細胞の細胞内PpIX蓄積量(X)あるいは蓄積量の範囲が算出される。
さらに上記にて治療実施後に算出されたPpIX蓄積量(X)から、医療従事者は、次の光線力学的治療を実施する際に目標とする治療効果を得るため、光照射エネルギー密度(P)や5-ALA投与量を光線力学的療法装置にプログラムされた回帰曲線に基づき再設定することができる。
13 データ出力部、 20 光源、 21 光量制御部
Claims (12)
- 被検体に5-アミノレブリン酸類を投与した後、細胞内に蓄積されたプロトポルフィリンIXに光を照射する光線力学的療法の条件パラメータを決定する方法であって、
プロセッサによって、実験段階において、細胞生存率(Y)、細胞内プロトポルフィリンIX蓄積量(X)および光照射エネルギー密度(P)の3つの条件パラメータ間の相関関係を表す回帰曲線を算出するステップと、
プロセッサによって、治療開始前に、細胞生存率(Y)、細胞内プロトポルフィリンIX蓄積量(X)および光照射エネルギー密度(P)のうちの2つの条件パラメータを予め選択し、前記回帰曲線を用いて残りの条件パラメータを決定するステップと、を含む光線力学的療法条件パラメータの決定方法。 - 前記回帰曲線は、4つのパラメータA~Dを用いた下記のモデル式で表される請求項1記載の光線力学的療法条件パラメータの決定方法。
Y=(A-D)/(1+(X/C)^B)+D - 細胞は、白血病、腫瘍、癌、ウィルス感染症、皮膚疾患、眼疾患、自己免疫疾患および移植片対宿主病(GVHD)からなるグループから選ばれたプロトポルフィリンIX蓄積性疾患を有する請求項1記載の光線力学的療法条件パラメータの決定方法。
- 被検体に5-アミノレブリン酸類を投与した後、細胞内に蓄積されたプロトポルフィリンIXに光を照射するための光源と、
光照射エネルギー密度(P)を制御する光量制御部と、
データを入力するデータ入力部と、
データを演算するプロセッサと、
データを記録するデータ記憶部と、を備え、
前記プロセッサは、実験段階において、細胞生存率(Y)、細胞内プロトポルフィリンIX蓄積量(X)および光照射エネルギー密度(P)の3つの条件パラメータ間の相関関係を表す回帰曲線を算出し、
治療開始前に、細胞生存率(Y)、細胞内プロトポルフィリンIX蓄積量(X)および光照射エネルギー密度(P)のうちの2つの条件パラメータを予め選択し、前記回帰曲線を用いて残りの条件パラメータを決定する、光線力学的療法装置。 - 前記回帰曲線は、4つのパラメータA~Dを用いた下記のモデル式で表される請求項4記載の光線力学的療法装置。
Y=(A-D)/(1+(X/C)^B)+D - 細胞は、白血病、腫瘍、癌、ウィルス感染症、皮膚疾患、眼疾患、自己免疫疾患および移植片対宿主病(GVHD)からなるグループから選ばれたプロトポルフィリンIX蓄積性疾患を有する請求項4記載の光線力学的療法装置。
- 請求項1~3のいずれかに係る光線力学的療法条件パラメータの決定方法によって決定された細胞内プロトポルフィリンIX蓄積量(X)に対応する投与量を有する5-アミノレブリン酸類を含む光線力学的療法用組成物。
- 被検体に5-アミノレブリン酸類を投与した後、光を照射することでプロトポルフィリンIXの蓄積した細胞を不活性化する光線力学的療法における光照射条件を決定する方法であって、
上記被検体から取り出した細胞におけるプロトポルフィリンIXの蓄積量を測定するステップと、
上記ステップにて測定されたプロトポルフィリンIXの蓄積量に基づき、予め定められた関係式を使用して光照射エネルギー密度を決定するステップと、を含む光線力学的療法における光照射条件の決定方法。 - 上記関係式は、予め算出した、細胞生存率(Y)、細胞内プロトポルフィリンIX蓄積量(X)および光照射エネルギー密度(P)の3つの条件パラメータ間の相関関係を表す回帰曲線に基づいて定められる請求項8記載の光線力学的療法における光照射条件の決定方法。
- 上記関係式は、プロトポルフィリンIX蓄積量(X)と光照射エネルギー密度(P)との関係を示すルックアップテーブルを含む請求項8または9記載の光線力学的療法における光照射条件の決定方法。
- 上記測定されたプロトポルフィリンIX蓄積量が所定値未満の場合には、複数回の光照射を決定する、請求項8~10のいずれかに記載の光線力学的療法における光照射条件の決定方法。
- 前記回帰曲線を用いて決定された条件パラメータを用いた治療を実施した後に、被検体の細胞生存率を計測し、得られた細胞生存率に基づいて細胞内プロトポルフィリンIX蓄積量を推定するステップと、
次の治療開始前に、推定した細胞内プロトポルフィリンIX蓄積量を用いて、光照射エネルギー密度および5-アミノレブリン酸類投与量を再設定するステップと、をさらに含む請求項1~3のいずれかに記載の光線力学的療法条件パラメータの決定方法。
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| JP2021501180A JP7288951B2 (ja) | 2019-02-19 | 2019-02-19 | 光線力学的療法条件パラメータの決定方法および光線力学的療法装置 |
| US17/432,067 US20220314021A1 (en) | 2019-02-19 | 2019-02-19 | Method for determining condition parameters for photodynamic therapy and photodynamic therapy apparatus |
| PCT/JP2019/006078 WO2020170330A1 (ja) | 2019-02-19 | 2019-02-19 | 光線力学的療法条件パラメータの決定方法および光線力学的療法装置 |
| EP19915947.6A EP3928831B1 (en) | 2019-02-19 | 2019-02-19 | Method for determining condition parameters for photodynamic therapy and photodynamic therapy apparatus |
| ES19915947T ES3039706T3 (en) | 2019-02-19 | 2019-02-19 | Method for determining condition parameters for photodynamic therapy and photodynamic therapy apparatus |
| TW109102961A TWI835984B (zh) | 2019-02-19 | 2020-01-31 | 光動力療法條件參數之決定方法、光動力療法裝置及光動力療法用組成物 |
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