Granted Patent B2

US 12,343,377 · App. 17/334,151 · Granted Jul 1, 2025

Inventors: Jaume Pons (San Francisco, CA); Hong Wan (Foster City, CA); Sophia Randolph (Chico, CA)

Assignee: ALX Oncology Inc.

A61K38/1774A61K31/122A61K31/352A61K31/405A61K31/513A61K31/635A61K31/706A61K31/7068A61K47/6425A61P35/02

Abstract

Claims (36)

1. A method of treating a myeloid cancer in an individual having a myeloid cancer, comprising administering to the individual an effective amount of: (a) a fusion polypeptide comprising a SIRPα D1 domain variant and an Fc domain variant, and (b) azacitidine;

wherein the SIRPα D1 domain variant of the fusion polypeptide comprises the amino acid sequence of SEQ ID NO: 81 or SEQ ID NO: 85;

wherein the Fc domain variant of the fusion polypeptide is

(i) a human IgG1 Fc region comprising L234A, L235A, G237A, and N297A mutations, wherein numbering is according to the EU index of Kabat;

(ii) a human IgG2 Fc region comprising A330S, P331S, and N297A mutations, wherein numbering is according to the EU index of Kabat;

(iii) a human IgG4 Fc region comprising S228P, E233P, F234V, L235A, and delG236 mutations, wherein numbering is according to the EU index of Kabat; or

(iv) a human IgG4 Fc region comprising S228P, E233P, F234V, L235A, delG236, and N297A mutations, wherein numbering is according to the EU index of Kabat; and

wherein the C-terminus of the SIRPα D1 domain variant of the fusion polypeptide is linked to the N-terminus of the Fc-domain variant.

2. A method of treating a myeloid cancer in an individual having a myeloid cancer, comprising administering to the individual an effective amount of: (a) a fusion polypeptide comprising a SIRPα D1 domain variant and an Fc domain variant, (b) azacitidine, and (c) venetoclax;

wherein the SIRPα D1 domain variant of the fusion polypeptide comprises the amino acid sequence of SEQ ID NO: 81 or SEQ ID NO: 85;

wherein the Fc domain variant of the fusion polypeptide is

(i) a human IgG1 Fc region comprising L234A, L235A, G237A, and N297A mutations, wherein numbering is according to the EU index of Kabat;

(ii) a human IgG2 Fc region comprising A330S, P331S, and N297A mutations, wherein numbering is according to the EU index of Kabat;

(iii) a human IgG4 Fc region comprising S228P, E233P, F234V, L235A, and delG236 mutations, wherein numbering is according to the EU index of Kabat; or

(iv) a human IgG4 Fc region comprising S228P, E233P, F234V, L235A, delG236, and N297A mutations, wherein numbering is according to the EU index of Kabat; and

wherein the C-terminus of the SIRPα D1 domain variant of the fusion polypeptide is linked to the N-terminus of the Fc-domain variant.

3. The method of claim 1 , wherein the myeloid cancer is myelodysplastic syndrome (MDS).

4. The method of claim 3 , wherein the MDS is higher risk MDS.

5. The method of claim 1 , wherein the individual has (a) received prior therapy for MDS or (b) has not received prior therapy for MDS.

6. The method of claim 1 , wherein treatment comprises an induction phase and a maintenance phase, wherein the induction phase comprises administering (a) the fusion polypeptide comprising a SIRPα D1 domain variant and an Fc domain variant, and (b) azacitidine, and wherein the maintenance phase comprises administering the fusion polypeptide comprising a SIRPα D1 domain variant and an Fc domain variant without azacitidine.

7. The method of claim 2 , wherein the myeloid cancer is acute myeloid leukemia (AML).

8. The method of claim 7 , wherein the individual has one or more of the following characteristics:

(a) cytological or histologically confirmed diagnosis of relapsed/refractory or newly diagnosed AML;

(b) AML that is relapsed/refractory or that is previously untreated and not considered suitable for intensive induction therapy;

(c) AML that is relapsed/refractory after prior treatment with a HMA-based regimen;

(d) previously untreated AML and is not considered suitable candidate for intensive induction therapy; and

(e) adequate renal and liver function.

9. The method of claim 2 , wherein venetoclax is administered at a dose of 100 mg on day 1, at a dose of 200 mg on day 2, and at a dose of 400 mg every day following day 2.

10. The method of claim 1 , wherein the fusion polypeptide is administered at a dose up to about 60 mg/kg.

11. The method of claim 10 , wherein the fusion polypeptide is administered at a dose of about 60 mg/kg once every four weeks (q4w).

12. The method of claim 1 , wherein the Fc domain variant (a) is a human IgG1 Fc region comprising L234A, L235A, G237A, and N297A mutations, wherein numbering is according to the EU index of Kabat or (b) comprises the amino acid sequence of SEQ ID NO: 91.

13. The method of claim 1 , wherein the fusion polypeptide comprises the amino acid sequence of SEQ ID NO: 135 or SEQ ID NO: 136.

14. The method of claim 1 , wherein the fusion polypeptide forms a homodimer.

15. The method of claim 1 , wherein the individual is a human.

16. The method of claim 2 , wherein the Fc domain variant (a) is a human IgG1 Fc region comprising L234A, L235A, G237A, and N297A mutations, wherein numbering is according to the EU index of Kabat or (b) comprises the amino acid sequence of SEQ ID NO: 91.

17. The method of claim 2 , wherein the fusion polypeptide comprises the amino acid sequence of SEQ ID NO: 135 or SEQ ID NO: 136.

Assignments (1)

Continuity (6)

References Cited (132)