Biopharmaceutical compositions

1. A composition comprising:

(i) an anti-IL-5 antibody comprising a heavy chain amino acid sequence as shown in SEQ ID NO: 1 and a light chain amino acid sequence as shown in SEQ ID NO: 2; and,

(ii) an oxidized anti-IL-5 antibody variant comprising SEQ ID NO:1 and SEQ ID NO: 2, except that residue M64 of SEQ ID NO:1 is oxidized.

2. The composition according to claim 1 , wherein the M64 oxidized antibody variant of (ii) comprises from 0.5% to 50% of the anti-IL5 antibodies in the composition.

3. The composition of claim 1 , wherein the composition comprises an oxidized variant of SEQ ID NO: 1, where residue W52 is oxidized.

4. The composition according to claim 3 , wherein the W52 oxidized antibody variant of SEQ ID NO:1 comprises from 0% to 3% of the anti-IL-5 antibodies in the composition.

5. The composition according to claim 1 , wherein the composition comprises a deamidated variant of SEQ ID NO: 2, where residue N31 is deamidated to aspartic acid or iso-aspartic acid.

6. The composition according to claim 5 , wherein the N31 deamidated antibody variant of SEQ ID NO:2 comprises from 0% to 20% of the anti-IL-5 antibodies in the composition.

7. The composition according to claim 6 , wherein the N31 deamidated antibody variant of SEQ ID NO:2 comprises ≤17.5%, ≤15%, ≤12.5, ≤10%, or ≤7.5% of the anti-IL-5 antibodies in the composition.

8. The composition according to claim 1 , wherein the composition comprises a deamidated variant of SEQ ID NO: 1, where residue N386 is deamidated to aspartic acid or iso-aspartic acid.

9. The composition according to claim 8 , wherein the N386 deamidated antibody variant of SEQ ID NO:1 comprises from 0% to 35% of the anti-IL-5 antibodies in the composition.

10. The composition according to claim 1 , wherein the composition comprises an oxidized antibody variant of SEQ ID NO:1, where residue M254 is oxidized, M360 is oxidized, and M430 is oxidized.

11. The composition according to claim 10 , wherein the M254, M360, and M430 oxidized variants comprise from 0% to 50% of the anti-IL-5 antibodies in the composition.

12. The composition according to claim 1 , wherein the composition comprises ≥50% SEQ ID NO: 1 C-terminal lysine K449 deleted antibody variant.

13. The composition according to claim 1 , wherein the composition comprises: ≥50% SEQ ID NO: 1 pyro-glutamate N-terminal antibody variant.

14. The composition according to claim 1 , wherein the composition comprises ≤80% acidic antibody variants.

15. The composition according to claim 1 , wherein the composition comprises ≤20% aggregated antibody variant.

16. The composition according to claim 1 , wherein the composition has at least 0.70 IL-5 specific antigen binding activity compared with a reference standard composition, the reference standard composition comprising:

(a) an antibody having a heavy chain amino acid sequence as shown in SEQ ID NO: 1 and a light chain amino acid sequence as shown in SEQ ID NO: 2;

(b) 98% or more SEQ ID NO:1 C-terminal lysine deleted variant of the antibody;

(c) 95% or more SEQ ID NO:1 N-terminal pyroglutamate variant of the antibody;

(d) 6% or less of the antibody wherein residue 31 of SEQ ID NO: 2 is replaced with either an aspartic acid or an iso-aspartic acid;

(e) 4% or less methionine or cysteine oxidated variant;

(f) 0.1% or less tryptophan oxidated variant; and

(g) 0.4% aggregated antibodies of the reference standard.

17. A pharmaceutical composition comprising a composition according to claim 1 and a pharmaceutically acceptable carrier.

18. The composition according to claim 1 , wherein the antibody is at a concentration of between 75 mg/mL to 100 mg/mL.

19. The composition according to claim 1 , wherein the composition comprises one or a combination of:

i. a buffering agent selected from the group consisting of sodium phosphate dibasic heptahydrate, phosphate, citrate, sodium phosphate, potassium phosphate, sodium citrate, and histidine, providing a pH of between 6.8 and 7.2 or a pH of between 6.2 and 6.6;

ii. a sugar;

iii. polysorbate 80; or

iv. EDTA.

20. The composition according to claim 19 , wherein the buffering agent is present in the range from 10-30 mM.

21. The composition according to claim 19 , wherein the sugar is sucrose and is present at a concentration of 5-20% weight by volume.

22. The composition according to claim 19 , wherein the polysorbate 80 is present at a concentration of 0.01% to 0.1% weight by volume.

23. The composition according to claim 19 , wherein the EDTA is present at a concentration of 0.01 mM to 0.1 mM.

24. The composition according to claim 19 , wherein the composition comprises 100 mg/ml antibody and;

i) 15.5 mM sodium phosphate dibasic heptahydrate and 4.5 mM citric acid monohydrate at pH 6.3;

ii) 12% weight of sucrose to volume;

iii) 0.02% weight of polysorbate 80 to volume, and

iv) 0.05 mM EDTA.

25. The composition according to claim 19 , wherein the composition is lyophilized and comprises 100 mg/mL antibody and;

i) 20 mM sodium phosphate dibasic heptahydrate at pH about 6.8 to about 7.2;

ii) 12% weight of sucrose to volume; and

iii) 0.05% weight of polysorbate 80 to volume.