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US20180243215A1 - Liposome composition and method for producing the same - Google Patents

Liposome composition and method for producing the same Download PDF

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Publication number
US20180243215A1
US20180243215A1 US15/968,110 US201815968110A US2018243215A1 US 20180243215 A1 US20180243215 A1 US 20180243215A1 US 201815968110 A US201815968110 A US 201815968110A US 2018243215 A1 US2018243215 A1 US 2018243215A1
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Prior art keywords
liposome
nucleic acid
lipid
anticancer agent
acid analog
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US15/968,110
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English (en)
Inventor
Takahiro SEKIGUCHI
Mikinaga Mori
Kentaro NUMAJIRI
Hiroyuki Kitaoka
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Fujifilm Corp
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Fujifilm Corp
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Assigned to FUJIFILM CORPORATION reassignment FUJIFILM CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KITAOKA, HIROYUKI, MORI, MIKINAGA, NUMAJIRI, Kentaro, SEKIGUCHI, TAKAHIRO
Publication of US20180243215A1 publication Critical patent/US20180243215A1/en
Priority to US17/140,502 priority Critical patent/US20210128471A1/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/10—Dispersions; Emulsions
    • A61K9/127—Liposomes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
    • A61K31/7042—Compounds having saccharide radicals and heterocyclic rings
    • A61K31/7052—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides
    • A61K31/706—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides containing six-membered rings with nitrogen as a ring hetero atom
    • A61K31/7064—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides containing six-membered rings with nitrogen as a ring hetero atom containing condensed or non-condensed pyrimidines
    • A61K31/7068—Compounds having saccharide radicals and heterocyclic rings having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides containing six-membered rings with nitrogen as a ring hetero atom containing condensed or non-condensed pyrimidines having oxo groups directly attached to the pyrimidine ring, e.g. cytidine, cytidylic acid
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/10—Dispersions; Emulsions
    • A61K9/127—Liposomes
    • A61K9/1271—Non-conventional liposomes, e.g. PEGylated liposomes, liposomes coated with polymers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/10—Dispersions; Emulsions
    • A61K9/127—Liposomes
    • A61K9/1277—Processes for preparing; Proliposomes
    • A61K9/1278—Post-loading, e.g. by ion or pH gradient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents

Definitions

  • the present invention relates to a liposome composition containing a liposome containing a nucleic acid analog anticancer agent, and a method for producing the same.
  • an anticancer agent there is a drug of which attack on cancer cells is not affected by exposure time and a drug of which attack on cancer cells is significantly affected by exposure time as the anticancer agent is classified through descending classification (Cancer and Chemotherapy, 1976, Vol. 3, 1103-1110).
  • the liposome formulation is a formulation in which a drug is contained in a liposome formed of a lipid membrane.
  • JP2002-509866A A method for achieving a high drug encapsulation rate through distributing a mixture of liposomes and drugs in the liposomes while maintaining a constant temperature is disclosed in JP2002-509866A as a method for making a liposome contain a drug.
  • a remote loading method in which ammonium sulfate or the like is contained in a liposome and then the drug is encapsulated is disclosed in Pharmaceutical Research, 2014, 31, 12583-2592 as a method for making a liposome contain a drug.
  • anticancer agents for example, an antimetabolite that inhibits synthesis of DNA attacks only a part of cells at a DNA synthesis phase. Therefore, in a case where an exposure time is short, effective cytocidal properties cannot be obtained. In a case where in vivo metabolism after administration of such a drug is fast, in many cases, sufficient exposure time in tumors cannot be obtained and an expected drug efficacy cannot be obtained.
  • an administration method for exposing an anticancer agent at a dilute concentration for a long period of time through instillation in order to obtain sufficient exposure time is greatly impaired, for example, a problem of restraint of a patient during instillation.
  • An object of the present invention is to provide a liposome composition containing a liposome having an excellent leakage rate of a nucleic acid analog anticancer agent, and a method for producing the same.
  • a liposome in which a content ratio of a lysophospholipid contained in a lipid forming a liposome with respect to the total amount of a phospholipid other than the lysophospholipid contained in the lipid forming the liposome is 0.01 mol % to 5 mol % and a nucleic acid analog anticancer agent/lipid ratio is 2 mass % to 10 mass %, has an excellent leakage rate of a nucleic acid analog anticancer agent.
  • a liposome composition containing the liposome having an excellent leakage rate of the nucleic acid analog anticancer agent by including a step of mixing a nucleic acid analog anticancer agent solution of which the temperature is kept at 40° C. to 50° C. with a solution in which an empty liposome is dispersed and a step of heating the mixture to a temperature of higher than or equal to 55° C., and have completed the present invention.
  • the present invention provides the following.
  • a liposome composition comprising: a liposome which (1) contains a nucleic acid analog anticancer agent and in which (2) a content ratio of a lysophospholipid contained in a lipid forming the liposome with respect to a total amount of phospholipids other than the lysophospholipid contained in the lipid forming the liposome is 0.01 mol % to 5 mol % and (3) a nucleic acid analog anticancer agent/lipid ratio is 2 mass % to 10 mass %.
  • the liposome composition according to [1] in which the nucleic acid analog anticancer agent is gemcitabine or a salt thereof.
  • a method for producing a liposome composition containing a liposome which (1) contains a nucleic acid analog anticancer agent and in which (2) a content ratio of a lysophospholipid contained in a lipid forming the liposome with respect to a total amount of phospholipids other than the lysophospholipid contained in the lipid forming the liposome is 0.01 mol % to 5 mol % and (3) a nucleic acid analog anticancer agent/lipid ratio is 2 mass % to 10 mass %, the method comprising: a step (a) of mixing a nucleic acid analog anticancer agent solution with a solution in which an empty liposome is dispersed; and a step (b) of heating the mixture to a temperature higher than or equal to 55° C.
  • a method for producing a liposome composition containing a liposome which (1) contains a nucleic acid analog anticancer agent and in which (2) a content ratio of a lysophospholipid contained in a lipid forming the liposome with respect to a total amount of phospholipids other than the lysophospholipid contained in the lipid forming the liposome is 0.01 mol % to 5 mol % and (3) a nucleic acid analog anticancer agent/lipid ratio is 2 mass % to 10 mass %, the method comprising: a step (a) of mixing a nucleic acid analog anticancer agent solution with a solution in which an empty liposome is dispersed; a step (b) of heating the mixture to a temperature higher than or equal to 55° C.; and a step (c) of dissolving the nucleic acid analog anticancer agent solution at a pH of 1 to 5 before the step (a), in which the step (b) is a step of heating the mixture to a temperature
  • the liposome contained in the liposome composition of the present invention has an excellent leakage rate of a nucleic acid analog anticancer agent.
  • FIG. 1 is a graph showing a relationship between incubation time and a leakage ratio of gemcitabine in plasma.
  • FIG. 2 is a graph showing a result of measurement of particle size distribution.
  • the numerical range represented by “to” indicates a range including numerical values denoted before and after “to” as a minimum value and a maximum value.
  • % means a mass percentage
  • the amount of each component in a composition means, unless otherwise specified, a total amount of a plurality of substances present in the composition in a case where the plurality of substances corresponding to each component are present in the composition.
  • nucleic acid analog anticancer agent/lipid ratio means a mass ratio of a nucleic acid analog anticancer agent contained in a liposome to a lipid forming the liposome.
  • the “empty liposome” means a liposome containing no drug.
  • the “leakage” means that a drug contained in a liposome passes through a lipid membrane forming the liposome and is released to the outside of the liposome.
  • the “leakage rate” means an amount of a drug contained in a liposome which passes through a lipid membrane forming the liposome and is released to the outside of the liposome, per unit time.
  • Retentivity in blood means a property in which a drug in a state of being encapsulated in a liposome is present in blood in a target to which a liposome composition is administered.
  • the “average particle diameter of the liposome” means a volume average particle diameter of liposomes present in a liposome composition.
  • the average particle diameter of liposomes contained in the liposome composition of the present invention is measured through a dynamic light scattering method. Examples of commercially available determination devices using dynamic light scattering include a concentrated particle analyzer FPAR-1000 (manufactured by OTSUKA ELECTRONICS Co., LTD.), NANOTRAC UPA (manufactured by Nikkiso Co., Ltd.), and NANOSIZER (manufactured by Malvern Instruments Ltd.)
  • the “target” is a mammal, such as a human, a mouse, a monkey, or a domestic animal, requiring prevention or treatment of a tumor, and is preferably a human who requires prevention or treatment thereof.
  • tumor cancer examples include breast cancer, endometrial cancer, ovarian cancer, prostate cancer, lung cancer, stomach cancer (gastric adenocarcinoma), non-small-cell lung cancer, pancreatic cancer, head and neck squamous cell cancer, esophageal cancer, bladder cancer, melanoma, colorectal cancer, renal cell carcinoma, non-Hodgkin lymphoma, and urothelial cancer.
  • a liposome is a closed endoplasmic reticulum formed of a lipid bilayer membrane using a lipid and has an aqueous phase (inner aqueous phase) in a space of the closed endoplasmic reticulum.
  • the inner aqueous phase contains water and the like.
  • Liposomes usually exist in a state of being dispersed in an aqueous solution (outer aqueous phase) on the outside of the closed endoplasmic reticulum.
  • a liposome may be a single lamella (also called a monolayer lamella or a unilamella, with a single layer structure of a bilayer membrane), or may be a multilayer lamella (also called a multilamella with a structure of multiple bilayer membranes having an onion shape in which each of the layers is partitioned by a watery layer).
  • a liposome of a single lamella is preferable in the present invention from the viewpoints of safety and stability in medical use.
  • the form of the liposome is not particularly limited as long as it is a liposome capable of containing a drug.
  • the “containing” means a form in which a drug is included in an inner aqueous phase and the membrane itself of the liposome.
  • a form in which a drug is contained in a closed space formed of a membrane, a form in which a drug is contained in a membrane itself, or a combination thereof may be used.
  • the average particle diameter of a liposome is preferably 10 nm to 150 nm, more preferably 20 nm to 110 nm, and still more preferably 30 nm to 90 nm.
  • a liposome has a spherical shape or a shape close thereto.
  • Components forming a lipid bilayer of a liposome are selected from lipids.
  • a lipid dissolving in a mixed solvent of a water-soluble organic solvent and an ester-based organic solvent can be optionally used as the lipids.
  • the lipids include phospholipids, lipids other than phospholipids, cholesterols, lysophospholipids, and derivatives thereof. These components may be formed of a single component or plural kinds of components.
  • phospholipids examples include natural or synthetic phospholipids such as phosphatidylcholine (lecithin), phosphatidylglycerol, phosphatidic acid, phosphatidylethanolamine, phosphatidylserine, phosphatidylinositol, sphingomyelin, and cardiolipin, or a substance hydrogenated thereto (for example, hydrogenated soybean phosphatidylcholine (HSPC)).
  • hydrogenated phospholipids such as hydrogenated soybean phosphatidylcholine or sphingomyelin are preferable, and hydrogenated soybean phosphatidylcholine is more preferable.
  • “phospholipids” also include phospholipid derivatives modified with phospholipids.
  • lipids other than phospholipids include lipids not containing phosphoric acid. Examples thereof include glycerolipids having no phosphoric acid moiety in its molecule and sphingolipids having no phosphoric acid moiety in its molecule. In the present invention, “lipids other than phospholipids” also include derivatives of lipids other than phospholipids modified with lipids other than phospholipids.
  • the lipid In a case of a substance in which a compound having a basic functional group is bonded to a lipid, the lipid is called a cationized lipid.
  • the cationized lipid can modify, for example, a membrane of a liposome, and therefore, it is possible to enhance the adhesiveness and the like to cells as target sites.
  • cholesterols examples include cholesterol, in which cyclopentahydrophenanthrene is a basic skeleton and a part or all of the carbon is hydrogenated, and a derivative thereof.
  • An example thereof includes cholesterol.
  • the curvature of a lipid membrane increases. Since distortion of membranes arranged in liposomes also increases, a water-soluble drug is more likely to leak out. It is effective to add cholesterol or the like in order to fill the distortion of membranes due to lipids (membrane stabilizing effect) as means to suppress the leakage.
  • cholesterols lowers the fluidity of membranes of the liposomes by, for example, filling the gap between the membranes of the liposomes.
  • the optimal range of the amount of cholesterols has not been known.
  • the content ratio of cholesterols with respect to the total amount of lipids forming the liposome according to the present invention is preferably 10 mol % to 35 mol %, more preferably 15 mol % to 25 mol %, and still more preferably 17 mol % to 21 mol %.
  • a hydrophilic polymer or the like for improving retentivity in blood a fatty acid, diacetyl phosphate, or the like as a stabilizer of a membrane structure, and ⁇ -tocopherol or the like as an antioxidant may be added to a liposome.
  • additives such as surfactants, for example, dispersion assistants which are not permitted for use in intravenous injection in medicinal use.
  • phospholipids, lipids other than phospholipids, cholesterols, or cholesterols are preferably modified with hydrophilic polymers, as phospholipids, lipids other than phospholipids, cholesterols, and derivatives thereof.
  • hydrophilic polymers examples include polyethylene glycols, polyglycerins, polypropylene glycols, polyvinyl alcohol, styrene-maleic acid anhydride alternating copolymers, polyvinyl pyrrolidone, and synthetic polyamino acid.
  • the above-described hydrophilic polymers can be used alone or in combination of two or more thereof.
  • polyethylene glycols, polyglycerins, and polypropylene glycols are preferable, and polyethylene glycol (PEG), polyglycerin (PG), and polypropylene glycol (PPG) are more preferable.
  • Polyethylene glycol (PEG) is more preferable from the viewpoints of versatility and retentivity in blood.
  • the molecular weight of PEG is not particularly limited, but is 500 to 10,000 Dalton, preferably 1,000 to 7,000 Dalton, and more preferably 2,000 to 5,000 Dalton.
  • lipid modified with PEG PEG-modified lipid
  • PEG-modified lipids include 1,2-distearoyl-3-phosphatidylethanolamine-PEG2000 (manufactured by NOF CORPORATION), 1,2-distearoyl-3-phosphatidylethanolamine-PEG5000 (manufactured by NOF CORPORATION), and 1,2-distearoyl-3-phosphatidylethanolamine-polyethylene glycol such as distearoyl glycerol-PEG2000 (manufactured by NOF CORPORATION).
  • PEG-modified lipids may be added such that 0.3 to 50 mass %, preferably 0.5 to 30 mass %, and more preferably 1 to 20 mass % is contained with respect to the total lipid amount.
  • a combination of hydrogenated soybean phosphatidylcholine (a lipid contained in the liposome), 1,2-distearoyl-3-phosphatidylethanolamine-polyethylene glycol (a lipid used together with a main lipid), and a lipid of cholesterol is preferable.
  • the liposome according to the present invention it is preferable not to contain an anionic polymer (polyanion).
  • a lysophospholipid is a hydrolysate of a phospholipid and means a phospholipid having one acyl group.
  • lysophospholipids examples include lysophosphatidylcholine (lysolecithin), lysophosphatidylglycerol, lysophosphatidic acid, lysophosphatidylethanolamine, lysophosphatidylserine, lysophosphatidylinositol, lysosphingomyelin, and hydrogenated soybean lysophosphatidylcholine.
  • the content ratio of the lysophospholipid contained in a lipid forming a liposome with respect to the total amount of phospholipids other than the lysophospholipid contained in the lipid forming the liposome is 0.01 mol % to 5 mol %, preferably 0.05 to 4 mol %, and more preferably 0.1 to 3 mol %.
  • the leakage rate of a nucleic acid analog anticancer agent can be controlled by setting the content ratio of a lysophospholipid contained in a lipid forming a liposome to 0.01 mol % to 5 mol % with respect to the total amount of phospholipids other than the lysophospholipid contained in lipid forming the liposome.
  • the liposome according to the present invention contains a nucleic acid analog anticancer agent as a drug.
  • the nucleic acid analog anticancer agent is an anticancer agent that has a structure similar to that of a nucleic acid material such as purine base or pyrimidine base and exhibits its drug efficacy by being incorporated into a DNA chain.
  • nucleic acid analog anticancer agents examples include gemcitabine, cytarabine, thioguanine, enocitabine, capecitabine, nelarabine, decitabine, clofarabine, azacytidine, fludarabine, cladribine, 1-(2-deoxy-2-fluoro-4-thio- ⁇ -D-arabinofuranosyl) cytosine, or salts thereof.
  • salts of basic groups include salts of mineral acids such as hydrochloric acid, hydrobromic acid, nitric acid, and sulfuric acid; salts of organic carboxylic acids such as formic acid, acetic acid, citric acid, oxalic acid, fumaric acid, maleic acid, succinic acid, malic acid, tartaric acid, aspartic acid, and trichloroacetic acid and trifluoroacetic acid; and salts of sulfonic acids such as methanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, mesitylenesulfonic acid, and naphthalenesulfonic acid.
  • mineral acids such as hydrochloric acid, hydrobromic acid, nitric acid, and sulfuric acid
  • organic carboxylic acids such as formic acid, acetic acid, citric acid, oxalic acid, fumaric acid, maleic acid, succinic acid, malic acid, tart
  • salts of acidic groups include salts of alkali metals such as sodium and potassium; salts of alkaline earth metals such as calcium and magnesium; ammonium salts; and salts of nitrogen-containing organic bases such as trimethylamine, triethylamine, tributylamine, pyridine, N,N-dimethylaniline, N-methylpiperidine, N-methylmorpholine, diethylamine, dicyclohexylamine, procaine, dibenzylamine, N-benzyl- ⁇ -phenethylamine, 1-ephenamine, and N,N′-dibenzylethylenediamine.
  • alkali metals such as sodium and potassium
  • salts of alkaline earth metals such as calcium and magnesium
  • ammonium salts and salts of nitrogen-containing organic bases
  • nitrogen-containing organic bases such as trimethylamine, triethylamine, tributylamine, pyridine, N,N-dimethylaniline, N-methylpiperidine, N-
  • gemcitabine or 1-(2-deoxy-2-fluoro-4-thio- ⁇ -D-arabinofuranosyl) cytosine or a salt thereof is preferable, and gemcitabine or a salt thereof is more preferable.
  • the drug (nucleic acid analog anticancer agent) contained in the liposome according to the present invention is present in a dissolved state in an inner aqueous phase of the liposome.
  • the dissolved state is regarded as a condition in which a drug is contained in a dissolved state in a case where the amount of the drug loaded with respect to the volume of the liposome is less than or equal to saturated solubility of the drug in the composition liquid of the inner aqueous phase.
  • the nucleic acid analog anticancer agent contained in a dissolved state is preferably one having a solubility of greater than or equal to 1 mg/ml with respect to water and more preferably having a solubility of greater than or equal to 10 mg/ml with respect to water.
  • gemcitabine is preferable.
  • the content of the nucleic acid analog anticancer agent contained in the liposome is preferably 0.1 to 2.0 mg/ml and more preferably 0.2 to 1.0 mg/ml with respect to the liposome composition.
  • the nucleic acid analog anticancer agent/lipid ratio of the liposome according to the present invention is 2 mass % to 10 mass %, preferably 2.5 mass % to 10 mass %, and more preferably 3 mass % to 10 mass %.
  • the lipids in the nucleic acid analog anticancer agent/lipid ratio mean all the lipids forming a liposome, and the lipids also include lysophospholipids.
  • the liposome composition according to the present invention can contain liposomes containing a nucleic acid analog anticancer agent and an aqueous solution in which the liposomes are dispersed.
  • the liposome composition of the present invention preferably has less than or equal to 1 mass % of a liposome having a particle diameter of greater than or equal to 200 nm, more preferably less than or equal to 0.5 mass %, and still more preferably less than or equal to 0.1 mass %
  • the osmotic pressure of the inner aqueous phase of the liposome is preferably 2 to 8 times, more preferably 2.5 to 6 times, and still more preferably 3 to 5 times the osmotic pressure of the outer aqueous phase of the liposome.
  • the liposome composition may contain at least one of a pharmaceutically acceptable isotonic agent, a stabilizer, an antioxidant, and a pH adjuster in relation to the administration route.
  • the isotonic agents are not particularly limited, but examples thereof include inorganic salts such as sodium chloride, potassium chloride, sodium hydrogen phosphate, sodium dihydrogen phosphate, and potassium dihydrogen phosphate, polyols such as glycerol, mannitol, and sorbitol, and saccharides such as glucose, fructose, lactose, or sucrose.
  • inorganic salts such as sodium chloride, potassium chloride, sodium hydrogen phosphate, sodium dihydrogen phosphate, and potassium dihydrogen phosphate
  • polyols such as glycerol, mannitol, and sorbitol
  • saccharides such as glucose, fructose, lactose, or sucrose.
  • the stabilizer is not particularly limited, but examples thereof include saccharides such as glycerol, mannitol, sorbitol, lactose, or sucrose.
  • the antioxidants are not particularly limited, but examples thereof include ascorbic acid, uric acid, tocopherol homologues (for example, vitamin E or four isomers of tocopherol ⁇ , ⁇ , ⁇ , and ⁇ ) cysteine, and ethylenediaminetetraacetic acid (EDTA).
  • the above-described stabilizer and antioxidant can be used alone or in combination of two or more thereof.
  • pH adjusters examples include sodium hydroxide, citric acid, acetic acid, triethanolamine, sodium hydrogen phosphate, sodium dihydrogen phosphate, and potassium hydrogen phosphate.
  • the liposome composition may contain a pharmaceutically acceptable organic solvent, collagen, polyvinyl alcohol, polyvinyl pyrrolidone, carboxyvinyl polymer, sodium carboxymethyl cellulose, sodium polyacrylate, sodium alginate, water soluble dextran, sodium carboxymethyl starch, pectin, methyl cellulose, ethyl cellulose, xanthan gum, gum arabic, casein, gelatin, agar, diglycerin, propylene glycol, polyethylene glycol, vaseline, paraffin, stearyl alcohol, stearic acid, human serum albumin (HSA), mannitol, sorbitol, lactose, PBS, sodium chloride, saccharides, an in vivo degradable polymer, a serum-free medium, and an additive which is acceptable as a pharmaceutical additive.
  • a pharmaceutically acceptable organic solvent collagen, polyvinyl alcohol, polyvinyl pyrrolidone, carboxyvinyl polymer, sodium carboxymethyl cellulose,
  • the liposome composition according to the present invention preferably contains ammonium sulfate, L-histidine, purified white sugar, sodium hydroxide, or hydrochloric acid.
  • a container to be filled with the liposome composition is not particularly limited, but it is preferably a material having low oxygen permeability.
  • An example thereof includes a bag using a laminate film having a plastic container, a glass container, an aluminum foil, an aluminum vapor deposition film, an aluminum oxide vapor deposition film, a silicon oxide vapor deposition film, polyvinyl alcohol, an ethylene vinyl alcohol copolymer, polyethylene terephthalate, polyethylene naphthalate, polyvinylidene chloride, and the like as a gas barrier layer. It is possible to shield light by employing a bag as necessary in which colored glass, aluminum foil, aluminum vapor deposition film, or the like is used.
  • the container filled with the liposome composition it is preferable to replace gas in a container space portion and in a drug solution with an inert gas such as nitrogen in order to prevent oxidation caused by oxygen present in the space portion in the container.
  • an inert gas such as nitrogen
  • nitrogen bubbling of an injection solution and filling of the container in a nitrogen atmosphere can be performed.
  • Parenteral administration is preferable as an administration route of the liposome composition.
  • Examples thereof include intravenous injection such as instillation, intramuscular injection, intraperitoneal injection, subcutaneous injection, intraocular injection, and intrathecal injection.
  • An example of the administration method includes administration using a syringe or through instillation.
  • the dosage and the number of times of administration of the drug contained in the liposome composition are selected within a range of 0.01 mg/kg to 100 mg/kg per day.
  • the dosage of the liposome composition of the present invention is not limited.
  • Cancer for which the liposome composition of the present invention can be effectively used is not particularly limited as long as they are carcinomas and sarcomas in which a taxane antitumor agent is used.
  • examples thereof include breast cancer, endometrial cancer, ovarian cancer, prostate cancer, lung cancer, stomach cancer (gastric adenocarcinoma), non-small-cell lung cancer, pancreatic cancer, head and neck squamous cell cancer, esophageal cancer, bladder cancer, melanoma, colorectal cancer, renal cell carcinoma, non-Hodgkin lymphoma, and urothelial cancer, and pancreatic cancer is preferable.
  • the leakage rate of a drug in blood is preferably 10 mass %/24 hr to 70 mass %/24 hr, more preferably 20 mass %/24 hr to 60 mass %/24 hr, and still more preferably 20 mass %/24 hr to 50 mass %/24 hr.
  • the leakage rate in blood depends on the temperature, it is preferable to measure the release rate under a constant temperature condition.
  • the temperature is not particularly limited, but it is preferable to measure the leakage rate within a range of body temperature (35° C. to 38° C.).
  • a drug contained in a liposome is a nucleic acid analog anticancer agent and the leakage rate of the drug in blood is less than 15 mass %/24 hr
  • sufficient exposure time of the nucleic acid analog anticancer agent in the body cannot be obtained, and in many cases, the expected drug efficacy cannot be obtained.
  • liposomes containing the nucleic acid analog anticancer agent remain in the body for an unnecessarily long period of time, and therefore, in some cases, unexpected toxicity may be exhibited due to accumulation of the liposomes in the tissue such as the skin in which the liposomes are hardly distributed normally.
  • the leakage rate in blood is greater than 70 mass %/24 hr
  • the amount of drug to be exposed per unit time increases. Therefore, the maximum blood concentration increases, thereby increasing the toxicity.
  • the retentivity in blood decreases due to a leaking drug which is distributed in tissues other than a tumor site and undergoes rapid metabolism.
  • the method for measuring the leakage rate in blood is not particularly limited. However, after administering the drug to a target mammal, model system, or the like, blood, plasma, or the like is collected from the mammal or the model system every unit time, and pretreatment or the like is performed as necessary. Moreover, the target drug can be measured through a method such as liquid high-speed chromatography or mass spectrometry.
  • the method for producing a liposome composition of the present invention is a method for producing a liposome composition containing a liposome which (1) contains a nucleic acid analog anticancer agent and in which (2) a content ratio of a lysophospholipid contained in a lipid forming the liposome with respect to a total amount of phospholipids other than the lysophospholipid contained in the lipid forming the liposome is 0.01 mol % to 5 mol % and (3) a nucleic acid analog anticancer agent/lipid ratio is 2 mass % to 10 mass %, the method including: a step (a) of mixing a nucleic acid analog anticancer agent solution (preferably a nucleic acid analog anticancer agent solution of which the temperature is kept at 40° C. to 50° C.) with a solution in which an empty liposome is dispersed; and a step (b) of heating the mixture to a temperature higher than or equal to 55° C.
  • the method for producing a liposome composition of the present invention can include a step (f) of emulsifying a lipid dissolved in an organic solvent to form an empty liposome without undergoing a drying and solidifying step before the step (a) of mixing a nucleic acid analog anticancer agent solution (preferably a nucleic acid analog anticancer agent solution of which the temperature is kept at 40° C. to 50° C.) with a solution in which an empty liposome is dispersed.
  • a nucleic acid analog anticancer agent solution preferably a nucleic acid analog anticancer agent solution of which the temperature is kept at 40° C. to 50° C.
  • the method for producing the liposome composition of the present invention can further include a step (e) of adjusting an osmotic pressure of an inner aqueous phase of the liposome to be 2 to 8 times an osmotic pressure of an outer aqueous phase of the liposome.
  • the method for producing a liposome composition may include other steps such as an evaporation step of evaporating the organic solvent used in the emulsification step, aseptic filtration, and aseptic filling as necessary.
  • an aqueous phase can be mixed with an oil phase in which at least one kind of lipid is dissolved in an organic solvent, and the aqueous solution containing the lipid can be stirred and emulsified.
  • an emulsion in which the oil phase and the aqueous phase are emulsified in an O/W type is prepared.
  • a part or all of the organic solvent derived from the oil phase is removed by an evaporation step to be described below to form a liposome.
  • a part or all of the organic solvent in the oil phase evaporates in the process of the stirring and the emulsifying to form a liposome.
  • ultrasonic wave or mechanical shear force is used for particle miniaturization.
  • an extruder treatment or a microfluidizer treatment can be performed through a filter having a constant pore diameter.
  • a secondarily formed multivesicular liposome can be released to form a univesicular liposome.
  • the average particle diameter of liposomes to be prepared can be controlled by optionally selecting the speed and time of stirring. From the viewpoint of obtaining liposomes having safety and stability, it is preferable to apply shearing to an aqueous solution containing lipids at a circumferential speed of higher than or equal to 20 m/sec.
  • the shearing is not limited. However, specifically, it is preferable to apply shearing at a circumferential speed of 20 m/sec to 35 m/sec and more preferable to apply shearing at a circumferential speed of 23 m/sec to 30 m/sec.
  • the emulsification step is not limited as long as it is a step of emulsification, but is preferably a step of applying high shearing and forming fine particles in an emulsification step in which an organic solvent is contained.
  • a liposome can be formed by evaporating (removing the solvent) the organic solvent used in the emulsification step as necessary.
  • the liquid temperature in the emulsification step in a case of producing the liposome can be appropriately controlled.
  • the liquid temperature at the time of mixing an oil phase with an aqueous phase is preferably higher than or equal to a phase transition temperature of a lipid to be used.
  • liquid temperature is preferably 35° C. to 70° C.
  • a mixed solvent of a water-soluble organic solvent and an ester-based organic solvent is used as an organic solvent used as an oil phase.
  • organic solvents such as chloroform, methylene chloride, hexane, cyclohexane, and the like as organic solvents, and it is more preferable not to use these organic solvents at all.
  • the water-soluble organic solvent is preferably an organic solvent having a property of being optionally mixed with water.
  • the water-soluble organic solvent include alcohols such as methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, and t-butanol, glycols such as glycerin, ethylene glycol, and propylene glycol, and polyalkylene glycols such as polyethylene glycol. Among these, alcohols are preferable.
  • At least one selected from ethanol, methanol, 2-propanol, and t-butanol is preferable, at least one selected from ethanol, 2-propanol, and t-butanol is more preferable, and ethanol is still more preferable.
  • the ester-based organic solvent is preferably an ester obtained from a reaction between an organic acid and alcohol.
  • the ester-based organic solvent include ethyl acetate, methyl acetate, isopropyl acetate, t-butyl acetate, and methyl propionate. At least one selected from ethyl acetate, isopropyl acetate, and methyl propionate is preferable, and ethyl acetate is more preferable.
  • the mixing ratio of the water-soluble organic solvent and the ester-based organic solvent can be set to, by mass ratio, for example, 90:10 to 30:70, and is preferably 80:20 to 40:60 and more preferably 80:20 to 70:30.
  • the mixed solvent of the water-soluble organic solvent and the ester-based organic solvent may further contain a aqueous solvent such as water or a buffer solution.
  • the aqueous solvent can be added within a range of, for example, 1 to 30 mass %.
  • the pH of the mixed solvent can be set, for example, to 3 to 10, and is preferably 4 to 9.
  • the ester-based organic solvent may contain physiologically active substances such as various drugs soluble in these solvents.
  • the mixing ratio of ethanol to ethyl acetate can be set, for example, to 80:20 to 70:30 by mass ratio.
  • the concentration of the lipid is not particularly limited and can be appropriately adjusted. However, in a solution using a mixed solution of a water-soluble organic solvent and an ester-based organic solvent, as a solvent, the concentration can be set to 40 g/L to 250 g/L, and is preferably 100 g/L to 200 g/L.
  • the aqueous phase means an outer aqueous phase and an inner aqueous phase.
  • the outer aqueous phase in the present invention means an aqueous solution in which liposomes are dispersed.
  • a solution occupying the outside of liposomes of a liposome dispersion liquid stored by being packaged in a vial or a prefilled syringe becomes an outer aqueous phase.
  • a solution dispersed at the time of use during administration using an attached liquid for dispersion or other dissolution liquid a solution occupying the outside of liposomes of a liposome dispersion liquid becomes an outer aqueous phase.
  • the inner aqueous phase in the present invention means an aqueous phase in a closed endoplasmic reticulum separated by a lipid bilayer membrane of a liposome.
  • aqueous solutions In a case of producing liposomes, water (distilled water, water for injection, or the like), physiological saline, various buffer solutions or aqueous solutions of saccharides, and a mixture thereof (aqueous solvent) are preferably used as aqueous solutions (outer aqueous phases) in which liposomes are dispersed.
  • the buffer solution is not limited to an organic type and an inorganic type.
  • a buffer solution having a buffering action in the vicinity of the hydrogen ion concentration close to a body fluid is suitably used, and examples thereof include a phosphate buffer solution, a Tris buffer solution, a citrate buffer solution, an acetate buffer solution, and Good's buffer solution.
  • an inner aqueous phase of liposomes may be an aqueous solution in which liposomes are dispersed, or water, physiological saline, various buffer solutions or aqueous solutions of saccharides, and a mixture thereof. Water used as an outer aqueous phase or an inner aqueous phase preferably does not contain impurities (such as dust and chemical substances).
  • the physiological saline means an inorganic salt solution adjusted so as to be isotonic with a human body, and may have a buffering function.
  • Examples of the physiological saline include saline containing 0.9 w/v % sodium chloride, phosphate-buffered physiological saline (hereinafter, also referred to as PBS), and Tris-buffered physiological saline.
  • An aqueous solution containing liposomes prepared through the emulsification step is subjected to after-treatment through methods such as centrifugal separation, ultrafiltration, dialysis, gel filtration, or freeze-drying in order to remove components not contained in the liposomes or adjust the concentration or osmotic pressure.
  • the obtained liposomes can have a uniform particle diameter through a dialysis method, a filtration method, an extrusion treatment, or the like.
  • the extrusion treatment means a step of applying a physical shear force by passing liposomes through a filter having pores for atomization.
  • the atomization can be rapidly performed by keeping the temperature of a liposome dispersion liquid and the filter at a temperature higher than or equal to the phase transition temperature of membranes forming the liposomes.
  • a liposome composition of the present invention it is possible to make a liposome contain a nucleic acid analog anticancer agent through a step (a) of mixing a nucleic acid analog anticancer agent solution of which the temperature is kept at 40° C. to 50° C. with a solution in which an empty liposome is dispersed and a step (b) of heating the mixture to a temperature of higher than or equal to 55° C.
  • the liposome having an excellent leakage rate is obtained through the steps.
  • the method for producing a liposome composition of the present invention includes a step (c) of dissolving the nucleic acid analog anticancer agent solution at a pH of 1 to 5 before the step (a) of mixing a nucleic acid analog anticancer agent solution (preferably a nucleic acid analog anticancer agent solution of which the temperature is kept at 40° C. to 50° C.) with a solution in which an empty liposome is dispersed.
  • the step (b) of heating the mixture to a temperature of higher than or equal to 55° C. is a step of heating the mixture to a temperature higher than or equal to 55° C. at a pH 5.0 to 13, preferably at a pH of 6.0 to 9.0, and more preferably at a pH of 6.5 to 8.0.
  • nucleic acid analog anticancer agent solution By dissolving the nucleic acid analog anticancer agent solution at a pH of 1 to 5, it is possible to dissolve the nucleic acid analog anticancer agent at a high concentration.
  • the nucleic acid analog anticancer agent is contained in a liposome in a range of a pH of 1 to 5, lipids of the liposome are easily decomposed, and lysophospholipids and the like increase.
  • analogs of the nucleic acid analog anticancer agents also increase.
  • nucleic acid analog anticancer agent it is possible to suppress the increase of lysophospholipids and analogs of a nucleic acid analog anticancer agent by carrying out the step of making a liposome contain the nucleic acid analog anticancer agent at a pH of 5.0 to 13, preferably at a pH of 6.0 to 9.0, and more preferably at a pH of 6.5 to 8.0.
  • the method for producing a liposome composition of the present invention preferably further includes a step (d) of lowering the temperature to 40° C. for longer than or equal to 5 minutes after the step (b) of heating the mixture to a temperature higher than or equal to 55° C.
  • the temperature is lowered to 40° C. for longer than or equal to 5 minutes in the step of lowering the temperature.
  • the temperature is preferably lowered to 40° C. for longer than or equal to 10 minutes and more preferably for longer than or equal to 15 minutes.
  • the method for producing the liposome composition of the present invention further includes a step (e) of adjusting an osmotic pressure of an inner aqueous phase of the liposome to be 2 to 8 times an osmotic pressure of an outer aqueous phase of the liposome.
  • the osmotic pressure of an inner aqueous phase of a liposome is adjusted to be 2 to 8 times the osmotic pressure of an outer aqueous phase of the liposome.
  • the osmotic pressure of the inner aqueous phase of the liposome is preferably adjusted to 2.5 to 6 times the osmotic pressure of the outer aqueous phase of the liposome and more preferably 3 to 5 times the osmotic pressure of the external aqueous phase of the liposome.
  • the leakage rate can be controlled by adjusting the osmotic pressure of an inner and an outer aqueous phase of a liposome.
  • the step of adjusting the osmotic pressure is not particularly limited, but an example thereof includes dialysis.
  • Solutes of an outer aqueous phase and an inner aqueous phase in a liquid obtained after the step of making a liposome contain a nucleic acid analog anticancer agent are homogenized, and the osmotic pressure at that time can be defined as an osmotic pressure of the inner aqueous phase of the liposome composition to be obtained.
  • a heating operation is limited to a case where a solute of an inner aqueous phase is sufficiently held, for example, by controlling the temperature to be lower than or equal to the phase transition temperature of a lipid.
  • the osmotic pressure of an outer aqueous phase can also be defined as an osmotic pressure of a dialysis solution used in the final dialysis step. However, this is limited to a case where it is possible to sufficiently perform replacement with the dialysis solution.
  • the obtained liquid of a liposome composition it is also possible to obtain the osmotic pressures of an inner aqueous phase and an outer aqueous phase by quantitatively determining the composition concentration of a solute of the outer aqueous phase and the composition concentration of a solute of the inner aqueous phase through centrifugal separation or ultrafiltration, and measuring the osmotic pressure of the composition liquid.
  • the osmotic pressure may be measured according to an osmometry method disclosed in the Japanese Pharmacopoeia, 16th Edition. More specifically, the osmolality can be obtained by measuring the freezing point descending degree of water. In addition, the freezing point descending degree of water is defined by the solute molarity, and the osmolality can also be obtained from the solute molarity.
  • the osmotic pressure of the outer aqueous phase exerts an essential effect on the living body during administration.
  • the osmotic pressure of the outer aqueous phase is far from osmotic pressure of body fluid, hemolysis or pain is caused due to movement of water in each tissue.
  • the osmotic pressure of the outer aqueous phase is preferably 200 mOsmol/L to 400 mOsmol/L, more preferably 250 mOsmol/L to 350 mOsmol/L, and still more preferably isotonic with body fluid.
  • An evaporation step may be provided in the method for producing a liposome composition as necessary.
  • an organic solvent is evaporated from an aqueous solution containing the liposomes obtained in the emulsification step.
  • the evaporation step includes at least a step of forcibly removing a part or all of the organic solvent derived from an oil phase as an evaporation step and a step of naturally evaporating a part or all of the organic solvent in an oil phase in the process of stirring and emulsifying.
  • the method for evaporating an organic solvent in the evaporation step is not particularly limited. However, for example, at least one of a step of evaporating an organic solvent through heating, a step of being left to stand or continuing gentle stirring after the emulsification, and a step of performing vacuum degassing may be performed.
  • the concentration of the organic solvent contained in an aqueous solution containing liposomes it is preferable to set the concentration of the organic solvent contained in an aqueous solution containing liposomes to less than or equal to 15 mass % within 30 minutes from the start of the step of evaporating an organic solvent.
  • the liposome composition is preferably subjected to aseptic filtration.
  • aseptic filtration unnecessary substances can be removed from an aqueous solution containing liposomes using a hollow fiber membrane, a reverse osmosis membrane, a membrane filter, or the like.
  • the filtration is preferably performed using a filter having a sterilizable pore diameter (preferably a 0.2 ⁇ m filtration sterilization filter).
  • the aseptic filtration step and the aseptic filling step are carried out at a temperature lower than or equal to the phase transition temperature of a lipid forming the liposome.
  • the phase transition temperature of the lipid is around 50° C.
  • about 0° C. to 40° C. is preferable and about 5° C. to 30° C. is more specifically preferable.
  • the liposome composition obtained after the aseptic filtration is preferably subjected to aseptic filling for medical use.
  • aseptic filling for medical use.
  • a well-known aseptic filling method can be applied. It is possible to prepare a suitable liposome composition for medical use by aseptically filling a container therewith.
  • the osmotic pressure was calculated from the solute molarity.
  • a sample was diluted 33 times the mass of the sample with phosphate-buffered physiological saline, and the volume average particle diameter and volume distribution of particle diameters were measured through a dynamic light scattering method using FPAR-1000AS (manufactured by OTSUKA ELECTRONICS Co., LTD.)
  • Gemcitabine contained in a liposome was quantitatively determined through liquid chromatography/ultraviolet-visible absorbance detection. Measurement conditions are shown below.
  • Both mobile phases A and B were water-methanol-trifluoroacetic acid mixed solutions, and the mobile phases were feed by changing the mixing ratio of the mobile phase A to the mobile phase B to control the concentration gradient.
  • Mobile phase A Methanol/water volume ratio of 5/95, 0.1% trifluoroacetic acid
  • Mobile phase B Methanol/water volume ratio of 25/75, 0.1% trifluoroacetic acid
  • Liquid temperature during sample injection Constant temperature around 25° C.
  • Lipids constituting a liposome were quantitatively determined through liquid chromatography/CAD detection. Measurement conditions are shown below.
  • Liquid temperature during sample injection Constant temperature around 25° C.
  • Lysophospholipids contained in lipids forming a liposome were quantitatively determined through the following method.
  • Mobile phase The concentration gradient was controlled by changing the mixing ratio of a mobile phase A to a mobile phase B.
  • Mobile phase A Water/methanol volume ratio of 20/80
  • Liquid temperature during sample injection Constant temperature around 25° C.
  • a 4 mM phosphate buffer solution (pH of 7.61) was prepared and used as an aqueous phase.
  • the average particle diameter at this time was 67.5 nm.
  • Gemcitabine hydrochloride was used as a drug. Gemcitabine hydrochloride was purchased from TEVA.
  • a 275 mM sucrose/10 mM histidine aqueous solution was prepared as an obtained dialysis solution of the liposome composition through dialysis.
  • the osmotic pressure obtained from the solute molarity of this solution was 285 mOsm/L.
  • Dialysis was performed at room temperature using this dialysis solution, each solute and non-encapsulated gemcitabine hydrochloride present in the outer aqueous phase of the drug loading solution were removed, and the outer aqueous phase was replaced with the dialysis solution.
  • the content ratio of the lysophospholipid contained in a lipid forming a liposome with respect to the total amount of phospholipids other than the lysophospholipid contained in the lipid forming the liposome is 0.62 mol %.
  • a gemcitabine-contained liposome composition was prepared in the same manner as in the drug loading solution in Example 1 except that the solution was cooled to 40° C. within 5 minutes.
  • the content ratio of the lysophospholipid contained in a lipid forming a liposome with respect to the total amount of phospholipids other than the lysophospholipid contained in the lipid forming the liposome is 0.65 mol %.
  • a liposome composition obtained from Example 1 or 2 was diluted (volume) 20 times with mouse plasma and incubated at 37° C. for 24 hours, and 100 ⁇ L was collected at points in time of 0, 1, 4, 7, and 24 hours. Subsequently, centrifugal filtration was carried out using an ultrafiltration filter (AMICON ULTRA-0.5 with 10 kDa manufactured by Millipore) under the conditions of 7,400 ⁇ g, for 30 minutes, and at 4° C. Gemcitabine contained in the collected filtrate was quantitatively determined through liquid chromatography/ultraviolet-visible absorbance detection, and the leakage ratio was calculated by the following equation.
  • Leakage ratio (%) (concentration of gemcitabine in filtrate after unit time of incubation) ⁇ 20 ⁇ concentration of gemcitabine contained in liposome composition ⁇ 100 Equation:
  • the lipid of the “Content ratio of lipid in liposome composition” in Table 1 also contains a lysophospholipid.
  • the “Content ratio of lysophospholipid” in Table 1 means the content ratio of a lysophospholipid contained in a lipid forming a liposome with respect to the total amount of phospholipids other than the lysophospholipid contained in the lipid forming the liposome.
  • Example 2 Average particle diameter (nm) 77.5 73.2 Gemcitabine concentration (mg/mL) 0.59 0.67 Content ratio (w/v %)of lipid in 1.55 1.98 liposome composition Gemcitabine/lipid ratio (w/w %) 3.8 3.4 Content ratio (mol %) of 0.62 0.65 lysophospholipid Leakage ratio (%) after 24 hours 23 32
  • the liposome composition obtained in Example 1 or 2 was diluted 33 times the mass with phosphate-buffered physiological saline and measurement was performed through a dynamic light scattering method using FPAR-1000AS (manufactured by OTSUKA ELECTRONICS Co., LTD.)
  • a 4 mM phosphate buffer solution was prepared and used as an aqueous phase.
  • the average particle diameter at this time was 67 nm.
  • Gemcitabine hydrochloride was used as a drug. Gemcitabine hydrochloride was purchased from TEVA.
  • 0.0973 g of gemcitabine hydrochloride, 0.425 g of PBS, and 0.464 g of water for injection of Japanese Pharmacopoeia were mixed with each other and were dissolved at 45° C. to 70° C. to prepare a drug solution.
  • the temperature of this drug solution was kept at 45° C., 1.1 mL of a drug non-encapsulated liposome and 8 M sodium hydroxide were added thereto, and the pH was adjusted to 5.0. Next, the solution was heated at 70° C. for 10 minutes, and then, cooled to 40° C. over 30 minutes and diluted with a 1,016 mM sucrose/37 mM histidine solution.
  • a 275 mM sucrose/10 mM histidine aqueous solution was prepared as an obtained dialysis solution of the liposome composition through dialysis.
  • the osmotic pressure obtained from the solute molarity of this solution was 285 mOsm/L.
  • Dialysis was performed at room temperature using this dialysis solution, each solute and non-encapsulated gemcitabine hydrochloride present in the outer aqueous phase of the drug loading solution were removed, and the outer aqueous phase was replaced with the dialysis solution.
  • a gemcitabine-contained liposome composition having a gemcitabine hydrochloride concentration of 0.68 mg/mL and a lipid content ratio of 2.0 w/v % in the liposome composition was obtained through the above-described step.
  • the content ratio of the lysophospholipid contained in a lipid forming a liposome with respect to the total amount of phospholipids other than the lysophospholipid contained in the lipid forming the liposome is 1.0 mol %.
  • a gemcitabine-contained liposome composition was prepared in the same manner as in the drug loading solution in Example 3 except that the pH was adjusted to 7.3.
  • a gemcitabine-contained liposome composition having a gemcitabine hydrochloride concentration of 0.79 mg/mL and a lipid content ratio of 2.0 w/v % in the liposome composition was obtained.
  • the content ratio of the lysophospholipid contained in a lipid forming a liposome with respect to the total amount of phospholipids other than the lysophospholipid contained in the lipid forming the liposome is 0.6 mol %.
  • a gemcitabine-contained liposome composition was prepared in the same manner as in the drug loading solution in Example 3 except that the pH was adjusted to 9.4.
  • a gemcitabine-contained liposome composition having a gemcitabine hydrochloride concentration of 0.67 mg/mL and a lipid content ratio of 2.1 w/v % in the liposome composition was obtained.
  • the content ratio of the lysophospholipid contained in a lipid forming a liposome with respect to the total amount of phospholipids other than the lysophospholipid contained in the lipid forming the liposome is 2.2 mol %.
  • a gemcitabine-contained liposome composition was prepared in the same manner as in the drug loading solution in Example 3 except that the pH was adjusted to 3.9.
  • a gemcitabine-contained liposome composition having a gemcitabine hydrochloride concentration of 0.42 mg/mL and a lipid content ratio of 2.3 w/v % in the liposome composition was obtained.
  • the content ratio of the lysophospholipid contained in a lipid forming a liposome with respect to the total amount of phospholipids other than the lysophospholipid contained in the lipid forming the liposome is 3.7 mol %.
  • a favorable gemcitabine/lipid ratio is shown which is obtained by performing the step of heating the mixture to a temperature higher than or equal to 55° C. at a pH of 5.0 to 13, preferably at a pH of 6.0 to 9.0, and more preferably at a pH of 6.5 to 8.0. This suggests that the production of lysophospholipids is suppressed and an excellent leakage rate is shown.

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JP6564873B2 (ja) 2019-08-21
EP3372223A1 (de) 2018-09-12
US20210128471A1 (en) 2021-05-06
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EP3372223A4 (de) 2018-09-12
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