Classifications

• • 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
  • A61K9/20—Pills, tablets, discs, rods
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
  • C07K7/04—Linear peptides containing only normal peptide links
  • C07K7/08—Linear peptides containing only normal peptide links having 12 to 20 amino acids
• • 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
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
  • A61K31/50—Pyridazines; Hydrogenated pyridazines
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K38/00—Medicinal preparations containing peptides
  • A61K38/04—Peptides having up to 20 amino acids in a fully defined sequence; Derivatives thereof
  • A61K38/10—Peptides having 12 to 20 amino acids
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
  • A61K47/16—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing nitrogen, e.g. nitro-, nitroso-, azo-compounds, nitriles, cyanates
  • A61K47/18—Amines; Amides; Ureas; Quaternary ammonium compounds; Amino acids; Oligopeptides having up to five amino acids
• • 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
  • A61K9/0012—Galenical forms characterised by the site of application
  • A61K9/0019—Injectable compositions; Intramuscular, intravenous, arterial, subcutaneous administration; Compositions to be administered through the skin in an invasive manner
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P5/00—Drugs for disorders of the endocrine system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P5/00—Drugs for disorders of the endocrine system
  • A61P5/02—Drugs for disorders of the endocrine system of the hypothalamic hormones, e.g. TRH, GnRH, CRH, GRH, somatostatin
• • 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
  • A61K9/08—Solutions

Definitions

• the present invention relates to liquid pharmaceutical compositions, in particular to depot formulations comprising somatostatin analogues and to a process for preparing said depot formulations.
• Somatostatin depot formulations are typically administered parenterally.
• Somatostatin depot formulations may be administered by injection subcutaneously or intramuscularly through a small gauge needle or placed into accessible tissue sites through a cannula.
• parenteral administration may be very painful especially if repeated injections are necessary.
• depot formulations which are administered in liquid form and which form a solid implant in the body after injection. Often the solidifying process starts in the syringe before injection and causes needle clogging.
• these depot formulations may comprise a polymer or a mixture of polymers that has to be dissolved in an organic solvent, e.g. they may comprise more than 50 % of an organic solvent. If the organic solvent remains in the solution for injection it might cause severe tissue irritation or necrosis at the site of implantation.
• EP 779 805 provides a pharmaceutical composition consisting of a soluble peptide salt which will form a gel upon contact with a body fluid, and up to 30% by weight of the composition of a pharmaceutically acceptable carrier.
• the peptides described in EP 779805 are somatostatins or a somatostatin analogs, e.g. lanreotide.
• the present invention provides in one aspect a pharmaceutical composition for parenteral administration comprising a somatostatin analogue salt of aspartate, e.g. mono- or diaspartate, glutamate, e.g. mono- or diglutamate, or succinate, e.g. mono- or disuccinate, lactate, acetate or citrate and water, forming a gelling depot after injection in contact with body fluid.
• the salt: base ratio of the somatostatin analogue salts may range from 0.1 to 2 and provides the solubility of the somatostatin analogue salt.
• the pharmaceutical composition has a pH between about 3.0 and 7.0, preferably from between 4.0 and 6.0 and more preferably from between about 4.0 and 5.0.
• the composition may comprise a pharmaceutically acceptable buffer in an amount to stabilize the pH between about 3.0 and 7.0, preferably between about 4.0 and 6.0, most preferably between 4.0 and 5.0.
• the present invention provides a pharmaceutical composition for parenteral administration comprising a somatostatin analogue salt of aspartate, e.g. mono- or diaspartate, glutamate, e.g. mono- or diglutamate, lactate, succinate, e.g. mono- or disuccinate, acetate or citrate, and water, having a pH between about 3.0 and 7.0, forming a gelling depot after injection in contact with body fluid.
• a somatostatin analogue salt of aspartate e.g. mono- or diaspartate
• glutamate e.g. mono- or diglutamate
• lactate lactate
• succinate e.g. mono- or disuccinate
• acetate or citrate acetate or citrate
• composition having a pH between about 3.0 and 7.0 provides good solubility and therefore the composition of the invention may be stored over an extended period of time without precipitation.
• the composition is administered to the patient by injection wherein the composition will start to form a gelling depot after and not before interaction with patients body fluid.
• the gelling depot releases the somatostatin analogue salt of aspartate, lactate, succinate, acetate, glutamate or citrate within the patient over an extended period of time.
• the invention provides a process for preparing a depot formulation by
• the invention provides a process for preparing a depot formulation by
• the present invention relates to somatostatin analogue salts of aspartate, e.g. mono- or diaspartate, lactate, succinate, e.g. mono- or disuccinate, acetate, glutamate, e.g. mono- or diglutamate or citrate.
• Somatostatin is a tetradecapeptide having the structure
• Somatostatin analogues of particular interest have been described e.g. in WO 97/01579 and WO 97/25977.
• Said somatostatin analogues comprise the amino acid sequence of formula I
• X 1 is a radical of formula (a) or (b)
• R 1 is optionally substituted phenyl, wherein the substituent may be halogen, methyl, ethyl, methoxy or ethoxy,
• R 2 is -Z 1 CH 2 R 1 , —CH 2 —CO—O—CH 2 —R 1 ,
• Z 1 is O or S
• X 2 is an ⁇ -amino acid having an aromatic residue on the C ⁇ side chain, or an amino acid unit selected from Dab, Dpr, Dpm, His,(Bzl)HyPro, thienyl-Ala, cyclohexyl-Ala and t-butyl-Ala, the residue Lys of said sequence corresponding to the residue Lys 9 of the native somato-statin-14.
• somatostatin analogue as used herein is meant a straight-chain or cyclic peptide derived from that of the naturally occurring somatostatin-14, comprising the sequence of formula I and wherein additionally one or more amino acid units have been omitted andlor replaced by one or more other amino acid radical(s) and/or wherein one or more functional groups have been replaced by one or more other functional groups andlor one or more groups have been replaced by one or several other isosteric groups.
• the term covers all modified derivatives of the native somatostatin-14 comprising the above sequence of formula I which have binding affinity in the nM range to at least one somatostatin receptor subtype as defined hereinafter.
• the somatostatin analogue is a compound in which the residues at positions 8 through 11 of the somatostatin-14 are represented by the sequence of formula I as defined above.
• the somatostatin analogue is a compound as disclosed above comprising a hexapeptide unit, the residues at positions 3 through 6 of said hexapeptide unit comprising the sequence of formula I.
• a somatostatin hexapeptide wherein the residues at positions 1 and 2 of the hexapeptide unit may be any of those as known in the art, e.g. as disclosed by A. S. Dutta in Small Peptides, Vol. 19, 292-354, Elsevier, 1993, or as substituents for, Phe 6 andlor Phe 7 of somatostatin-14.
• the somatostatin analogue is a compound in which the hexapeptide unit is cyclic, e.g. having a direct peptide linkage between the ⁇ -carbonyl group of the residue at position 6 and the ⁇ -amino group of the residue at position 1.
• Trp may have the D- or L-configuration. Preferably Trp has the D-configuration.
• X 1 is preferably a residue of formula (a) or (b), R 2 being preferably
• X 2 comprises an aromatic residue on the C ⁇ side chain
• it may suitably be a natural or unnatural ⁇ -amino acid, e.g. Phe, Tyr, Trp, Nal, Pal, benzothienyl-Ala, Tic and thyronin, preferably Phe or Nal, more preferably Phe.
• X 2 is preferably an ⁇ -amino acid bearing an aromatic residue on the C ⁇ side chain.
• R 1 is substituted phenyl, it may suitably be substituted by halogen, methyl, ethyl, methoxy or ethoxy e.g. in ortho and/or para. More preferably R 1 is unsubstituted phenyl.
• Z 1 is preferably O.
• X 1 and X 2 are as defined above,
• A is a divalent residue selected from Pro
• R 3 is NR 8 R 9 —C 2-6 alkylene, guanidino-C 2-6 alkylene or C 2-6 alkylene-COOH
• R 3a is H, C 1-4 alkyl or has independently one of the significances given for R 3
• R 3b is H or C 1-4 alkyl
• R a is OH or NR 5 R 6
• R b is —(CH 2 ) 1-3 — or —CH(CH 3 )—
• R 4 is H or CH 3
• R 4a is optionally ring-substituted benzyl
• each of R 5 and R 6 independently is H, C 1-4 alkyl, ⁇ -amino-C 1-4 alkylene, ⁇ -hydroxy-C 1-4 alkylene or acyl
• R 7 is a direct bond or C 1-6 alkylene
• each of R 8 and R 9 independently is H, C 1-4 alkyl, ⁇ -hydroxy-C 2-4 alkylene, acyl or CH 2 OH
• ZZ a is a natural or unnatural ⁇ -amino acid unit.
• ZZ a may have the D- or L-configuration.
• ZZ a is a natural or unnatural ⁇ -amino acid unit, it may suitably be e.g. Thr, Ser, Ala, Val, lie, Leu, Nle, His, Arg, Lys, Nal, Pal, Tyr, Trp, optionally ring-substituted Phe or N ⁇ -benzyl-Gly.
• ZZ a is Phe
• the benzene ring thereof may be substituted by e.g. NH 2 , NO 2 , CH 3 , OCH 3 or halogen, preferably in para position.
• ZZ a is Phe, the benzene ring thereof is preferably unsubstituted.
• any substituent present on the proline ring e.g. R 3 —NH—CO—O— etc., is preferably in position 4.
• Such substituted proline residue may exist in the cis form, e.g.
• NR 8 R 9 forms a heterocyclic group
• such group may be aromatic or saturated and may comprise one nitrogen or one nitrogen and a second heteroatom selected from nitrogen and oxygen.
• the heterocyclic group is e.g. pyridyl or morpholino.
• C 2-6 Alkylene in this residue is preferably —CH 2 —CH 2 —.
• Any acyl as R 5 , R 6 , R 8 and R 9 in A may be e.g. R 12 CO— wherein R 12 is H, C 1-4 alkyl, C 2-4 alkenyl, C 3-6 cycloalkyl or benzyl, preferably methyl or ethyl.
• R 4a or R 11 , in A is ring-substituted benzyl, the benzene ring may be substituted as indicated above for ZZ a .
• R is NR 10 R 11 —C 2-6 alkylene or guanidine-C 2-6 alkylene, and each of R 10 and R 11 independently is H or C 1-4 alkyl,
• the salts are obtained by the process as described e.g. in WO 2002/10192 which is hereby incorporated by reference.
• R is NR 10 R 11 —C 2-6 alkylene.
• Preferred compounds of formula II are the compounds wherein R is 2-amino-ethyl, namely cyclo[ ⁇ 4-(NH 2 —C 2 H 4 —NH—CO—O-)Pro ⁇ -Phg-DTrp-Lys-Tyr(4-Bzl)-Phe] (referred herein to as Compound A) and cyclo[ ⁇ 4-(NH 2 —C 2 H 4 —NH—CO—O-)Pro)-DPhg-DTrp-Lys-Tyr(4-Bzl)Phe], in free form, salt form or protected form.
• Phg means —HN—CH(C 6 H 5 )—CO— and Bzl means benzyl.
• a salt of the invention in protected form corresponds to a somatostatin analogue wherein at least one of the amino groups is protected and which by deprotection leads to a compound of formula II, preferably physiologically removable.
• Suitable amino protecting groups are e.g. as disclosed in “Protective Groups in Organic Synthesis”, T. W. Greene, J. Wiley & Sons NY (1981), 219-287, the contents of which being incorporated herein by reference.
• Example of such an amino protecting group is acetyl.
• the composition according to the present invention may comprise a buffer.
• Suitable buffers include but are not limited to acetate buffer, lactate buffer, glycin buffer and tartrate buffer.
• the concentrations of the buffers may be from about 5 mM to 30 mM, preferably from about 10 mM to 25 mM.
• the invention provides a pharmaceutical composition in a viscous liquid form that may be injected with a syringe through a needle ranging from 18 G to 25 G, e.g. 20 G.
• the solution may be placed in a syringe after sterile filtration through a 0.2 ⁇ m filter having a viscosity of from 1 to 10 4 mPa ⁇ s or after sterile filtration and solvent removal by evaporation or sublimation having a viscosity of from 10 2 to 10 6 mPa ⁇ s.
• the solvent removal may be done after placing the solution in the syringe.
• the solution in the syringe may be injected through a needle, e.g. a 20 G needle, into the body subcutaneously, intramuscularly, intradermally or intraperitoneally or placed into accessible tissue sites through a cannula. Once in place in contact with the patient's body fluid the gelling depot will be formed.
• the liquid composition for parenteral administration may be filled in a syringe, preferably a prefilled syringe may be provided together with instructions for use.
• the invention provides a depot formulation for extended release of the pharmaceutically active agent.
• the implant formed after injection into the body may release the active agent over an extended period of time.
• the release period may range from 1 up to 90 days, e.g. 1 up to 60 days, e.g. between 30 to 60 days.
• compositions of the invention are useful for treatment of the known indications of the particular active agent.
• compositions of the invention comprising a somatostatin analogue salt of aspartate, lactate, succinate, acetate, glutamate or citrate may be useful in the following indications:
• compositions of the invention are useful in the treatment of acromegaly, carcinoids andlor Cushing's Disease.
• liquid compositions of the invention may be indicated in standard clinical or animal tests.
• Appropriate dosage of the composition of the invention will of course vary, e.g. depending on the condition to be treated (for example the disease type of the nature of resistance), the drug used, the effect desired and the mode of administration.
• compositions of the invention comprising the somatostatin salt of aspartate, lactate, succinate, acetate, glutamate or citrate satisfactory results are obtained on administration, e.g. parenteral administration, at dosages in the order of from about 0.1 to about 100 mg, preferably from about 3 to about 60 mg per injection per month or about 0.01 to about 4 mg preferably 0.1 to 1 mg per kg animal body weight per month, administered once or in divided doses.
• Suitable monthly dosages for patients are thus in the order of about 0.1 mg to about 80 mg of a somatostatin analogue salt of aspartate, lactate, succinate, acetate, glutamate or citrate.
• the present invention provides a simple pharmaceutical composition of somatostatin analogue salt of aspartate, e.g. mono- or diaspartate, lactate, succinate e.g. mono- or disuccinate, acetate, glutamate, e.g. mono- or diglutamate, or citrate in a salt:base ratio ranging from 0.1 to 2 and water at a defined pH between 3.0 to 7.0, preferably between about 4.0 to 6.0, more preferably between about 4.0 to 5.0.
• the salt base ratio ranging from 0.1 to 2 provides the solubility of the somatostatin analogue salt at a given pH and the precipitation and depot formation after contact with body fluids and therefore environmental pH change.
• the pH may be stabilized by a buffer.
• the process to prepare the composition is simple by adding water to the somatostatin analogue salt. At a pH between about 4.0 to 6.0 the composition shows good solubility and therefore precipitation, e.g. in a prefilled, syringe or needle clogging is avoided. No organic solvents that might cause severe side effects at the place of administration are used.
• a 2 ml solution of the pharmaceutical composition of the present invention is made by mixing 0.8 g somatostatin diaspartate with 1.36 ml water for injection.
• the composition has been injected parenterally and blood samples have been taken several times during a period of 2 months to measure the somatostatin diaspartate.
• the di-succinate form of the pharmaceutical composition of the present invention is made by mixing 0.999 g somatostatin di-succinate with 1.6 ml water for injection.
• the di-glutamate form of the pharmaceutical composition of the present invention is made by mixing 0.916 g somatostatin di-glutamate with 1.44 ml water for injection.

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• 2004
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