Manufacture of degarelix

1. A method for producing a degarelix drug substance comprising the steps of:

a. Purifying degarelix as obtained by liquid or solid phase peptide synthesis to obtain a degarelix solution with a purity of at least 95%, as determined by high performance liquid chromatography (HPLC);

b. Evaporating from the degarelix solution solvent to concentrate the degarelix solution to obtain aggregated degarelix;

c. Deaggregating the aggregated degarelix with acetic acid; and

d. Lyophilizing the deaggregated degarelix to provide the degarelix drug substance.

2. The method according to claim 1 , wherein the acetic acid concentration at the end of step c is in the range of 15 to 35% (v/v).

3. The method according to claim 1 , wherein the temperature in step c is in the range of −5 to 30° C.

4. The method according to claim 1 , wherein the degarelix concentration (free base) is in the range of 10 to 35 g/l in step c.

5. A method for producing a degarelix drug substance comprising the steps of:

a. Purifying degarelix as obtained by liquid or solid phase peptide synthesis to obtain a degarelix solution with a purity of at least 95%, as determined by HPLC;

b. Loading the degarelix solution onto a chromatographic column;

c. Eluting degarelix from the column with acetic acid to provide eluted degarelix, wherein the acetic acid concentration is in the range of 27 to 37 wt. %;

d. Lyophilizing the eluted degarelix to provide the degarelix drug substance.

6. The method according to claim 5 , wherein the eluted degarelix is filtered prior to lyophilization.

7. A method for producing a degarelix drug substance comprising the steps of:

a. Purifying degarelix as obtained by liquid or solid phase peptide synthesis to obtain a degarelix solution with a purity of at least 95%, as determined by HPLC;

b. Adjusting the acetic acid concentration of the purified degarelix solution to 6 to 40% (w/w), if necessary; and

c. Spray-drying the degarelix solution to provide the degarelix drug substance.

8. A method for producing a lyophilized degarelix drug product, wherein the lyophilized degarelix drug product provides, upon reconstitution with a liquid in an amount of 20 mg degarelix free base/ml, a viscosity of up to 15 mPas, comprising the steps of:

a. Dissolving a lyophilized degarelix drug substance in a mannitol containing aqueous solution to provide a degarelix-mannitol mixture; and

b. Lyophilizing the degarelix-mannitol mixture to provide the lyophilized degarelix drug product,

wherein a non-ionic surfactant is added to the degarelix-mannitol mixture prior to lyophilization.

9. The method according to claim 8 , wherein the non-ionic surfactant is Polysorbate 20 or Tocopheryl-polyethylene-glycol-1000-succinate.

10. The method according to claim 8 , wherein the lyophilized degarelix drug product, upon reconstitution with the liquid, comprises the non-ionic surfactant in an amount ranging from 0.1 mg/ml to 5 mg/ml.

11. The method according to claim 8 , wherein the lyophilized degarelix drug substance provides, upon dissolution in an amount of 20 mg degarelix free base/ml in water containing mannitol (2.5% w/V), a viscosity of more than 3.2 mPas.

12. A degarelix drug product comprising a lyophilized degarelix drug product and a non-ionic surfactant, wherein the drug product provides, upon reconstitution with a liquid in an amount of 20 mg degarelix free base/ml, a viscosity of up to 15 mPas, and the non-ionic surfactant is present in an amount of 0.001 mg/ml to 5 mg/ml.

13. The method according to claim 12 , wherein the viscosity ranges from 2 to 12 mPas.

14. The method according to claim 8 , wherein the viscosity ranges from 2 to 12 mPas.