Claims for Patent: 6,565,874

Summary for Patent: 6,565,874

Title:	Polymeric delivery formulations of leuprolide with improved efficacy
Abstract:	The present invention is directed to a flowable composition that is suitable for use as a controlled release implant. The flowable composition includes a biodegradable thermoplastic polyester that is at least substantially insoluble in aqueous medium or body fluid. The flowable composition also includes a biocompatible polar aprotic solvent. The biocompatible polar aprotic solvent is miscible to dispersible in aqueous medium or body fluid. The flowable composition also includes leuprolide acetate.
Inventor(s):	Dunn; Richard L. (Fort Collins, CO), Garrett; John Steven (Fort Collins, CO), Ravivarapu; Harish (Union City, CA), Chandrashekar; Bhagya L (Fort Collins, CO)
Assignee:	Atrix Laboratories (Fort Collins, CO)
Application Number:	09/711,758
Patent Claims:	1. A flowable composition suitable for use as a controlled release implant, the composition comprising: (a) a biodegradable thermoplastic polyester that is at least substantially insoluble in aqueous medium or body fluid; (b) a biocompatible polar aprotic solvent selected from the group consisting of an amide, an ester, a carbonate, a ketone, an ether, and a sulfonyl; wherein the biocompatible polar aprotic solvent is miscible to dispersible in aqueous medium or body fluid; and (c) uncomplexed leuprolide acetate that is the only source of leuprolide in the composition. 2. The composition of claim 1 wherein the biodegradable thermoplastic polyester is a polylactide, a polyglycolide, a polycaprolactone, a copolymer thereof, a terpolymer thereof, or any combination thereof. 3. The composition of claim 1 wherein the biodegradable thermoplastic polyester is a polylactide, a polyglycolide, a copolymer thereof, a terpolymer thereof, or a combination thereof. 4. The composition of claim 1 wherein the biodegradable thermoplastic polyester is 50/50 poly (DL-lactide-co-glycolide) having a carboxy terminal group. 5. The composition of claim 1 wherein the biodegradable thermoplastic polyester is 75/25 poly (DL-lactide-co-glycolide) without a carboxy terminal group. 6. The composition of claim 1 wherein the biodegradable thermoplastic polyester is present in about 30 wt. % to about 40 wt. % or about 40 wt. % to about 50 wt. % of the composition. 7. The composition of claim 1 wherein the biodegradable thermoplastic polyester has an average molecular weight of about 23,000 to about 45,000 or about 15,000 to about 24,000. 8. The composition of claim 1 wherein the biocompatible polar aprotic solvent is N-methyl-2-pyrrolidone, 2-pyrrolidone, N,N-dimethylformamide, dimethyl sulfoxide, propylene carbonate, caprolactam, triacetin, or any combination thereof. 9. The composition of claim 1 wherein the biocompatible polar aprotic solvent is N-methyl-2-pyrrolidone. 10. The composition of claim 1 wherein the biocompatible polar aprotic solvent is present in about 60 wt. % to about 70 wt. % of the composition. 11. The composition of claim 1 wherein the biocompatible polar aprotic solvent is present in about 50 wt. % to about 60 wt. % of the composition. 12. The composition of claim 1 wherein the uncomplexed leuprolide acetate is present in about 2 wt. % to about 4 wt. % of the composition. 13. The composition of claim 1 wherein the uncomplexed leuprolide acetate is present in about 4 wt. % to about 8 wt. % of the composition. 14. The composition of claim 1 that is formulated as an injectable subcutaneous delivery system. 15. The composition of claim 14 having a volume of about 0.20 mL to about 0.40 mL. 16. The composition of claim 14 having a volume of about 0.30 mL to about 0.50 mL. 17. The composition of claim 14 that is formulated for administration about once per month. 18. The composition of claim 14 that is formulated for administration about once per three months. 19. The composition of claim 14 that is formulated for administration about once per four months to about once per six months. 20. A method for forming a flowable composition for use as a controlled release implant, comprising the step of mixing, in any order: (a) a biodegradable thermoplastic polyester that is at least substantially insoluble in aqueous medium or body fluid; (b) a biocompatible polar aprotic solvent selected from the group consisting of an amide, an ester, a carbonate, a ketone, an ether, and a sulfonyl; wherein the biocompatible polar aprotic solvent is miscible to dispersible in aqueous medium or body fluid; and (c) uncomplexed leuprolide acetate that is the only source of leuprolide for the composition; wherein the mixing is performed for a sufficient period of time effective to form the flowable composition for use as a controlled release implant. 21. The method of claim 20 wherein the biocompatible thermoplastic polyester and the biocompatible polar aprotic solvent are mixed together to form a mixture and the mixture is then mixed with the uncomplexed leuprolide acetate to form the flowable composition. 22. A biodegradable implant formed in situ, in a patient, by the steps comprising: (a) injecting a composition within the body of the patient; and (b) allowing the biocompatible polar aprotic solvent to dissipate to produce a solid biodegradable implant, wherein the composition comprises an effective amount of a biodegradable thermoplastic polyester that is at least substantially insoluble in aqueous medium or body fluid; an effective amount of a biocompatible polar aprotic solvent selected from the group consisting of an amide, an ester, a carbonate, a ketone, an ether, and a sulfonyl, wherein the biocompatible polar aprotic solvent is miscible to dispersible in aqueous medium or body fluid; and an effective amount of uncomplexed leuprolide acetate that is the only source of leuprolide in the composition. 23. The biodegradable implant of claim 22 wherein the patient is a human. 24. The biodegradable implant of claim 22 wherein the solid implant releases the effective amount of uncomplexed leuprolide as the solid implant biodegrades in the patient. 25. The biodegradable implant of claim 22 wherein the solid biodegradable implant adheres to tissue within the body of the patient. 26. A method of forming a biodegradable implant in situ, in a living patient, comprising the steps of: (a) injecting a flowable composition within the body of a patient; and (b) allowing the biocompatible polar aprotic solvent to dissipate to produce a solid biodegradable implant, wherein the flowable composition comprises an effective amount of a biodegradable thermoplastic polyester that is at least substantially insoluble in aqueous medium or body fluid; an effective amount of a biocompatible polar aprotic solvent selected from the group consisting of an amide, an ester, a carbonate, a ketone, an ether, and a sulfonyl; wherein the biocompatible polar aprotic solvent is miscible to dispersible in aqueous medium or body fluid; and an effective amount of uncomplexed leuprolide acetate that is the only source of leuprolide in the composition. 27. The method of claim 26 wherein the solid biodegradable implant releases the effective amount of uncomplexed leuprolide acetate by diffusion, erosion, or a combination of diffusion and erosion as the solid implant biodegrades in the patient. 28. A method of treating cancer in a patient comprising administering to the patient in need of such treatment an effective amount of a flowable composition of claim 1. 29. The method of claim 28 wherein the cancer is prostate cancer. 30. The method of claim 28 wherein the patient is a human. 31. A method of reducing LH levels in a patient comprising administering to the patient in need of such LHRH reduction an effective amount of a flowable composition of claim 1. 32. The method of claim 31 wherein the reduction of LH levels is useful to treat endometriosis. 33. A kit comprising: (a) a first container comprising a composition comprising a biodegradable thermoplastic polyester that is at least substantially insoluble in aqueous medium or body fluid and a biocompatible polar aprotic solvent selected from the group consisting of an amide, an ester, a carbonate, a ketone, an ether, and a sulfonyl; wherein the biocompatible polar aprotic solvent is miscible to dispersible in aqueous medium or body fluid; and (b) a second container comprising uncomplexed leuprolide acetate that is the only source of leuprolide in the composition. 34. The kit of claim 33 wherein the first container is a syringe. 35. The kit of claim 33 wherein the second container is a syringe. 36. The kit of claim 33 wherein the uncomplexed leuprolide acetate is lyophilized. 37. The kit of claim 33 further comprising instructions. 38. The kit of claim 33 wherein the first container can be connected to the second container. 39. The kit of claim 33 wherein the first container and the second container are each configured to be directly connected to each other. 40. A solid implant comprising: (a) a biocompatible thermoplastic polyester that is at least substantially insoluble in aqueous medium or body fluid; and (b) uncomplexed leuprolide acetate that is the only source of leuprolide in the implant; wherein the solid implant has a solid or gelatinous microporous matrix, the matrix being a core surrounded by a skin. 41. The solid implant of claim 40 further comprising a biocompatible organic solvent that is miscible to dispersible in aqueous or body fluid and dissolves the thermoplastic polyester. 42. The solid implant of claim 41 wherein the amount of biocompatible organic solvent is minimal. 43. The solid implant of claim 41 wherein the amount of biocompatible organic solvent decreases over time. 44. The solid implant of claim 40 wherein the core contains pores of diameters from about 1 to about 1000 microns. 45. The solid implant of claim 40 wherein the skin contains pores of smaller diameters than those of the core pores. 46. The solid implant of claim 40 wherein the skin pores are of a size such that the skin is functionally non-porous in comparison with the core. 47. A flowable composition suitable for use as a controlled release implant, the composition comprising: (a) a biodegradable thermoplastic polyester that is at least substantially insoluble in aqueous medium or body fluid; (b) a biocompatible polar aprotic solvent selected from the group consisting of an amide, an ester, a carbonate, a ketone, an ether, and a sulfonyl; and (c) uncomplexed leuprolide acetate that is the only source of leuprolide in the composition. 48. The composition of claim 47, wherein the polar aprotic solvent is able to diffuse into body fluid so that the flowable composition coagulates or solidifies after administration of the composition to a patient. 49. The composition of claim 48, wherein the patient is a human.