MULTI-CHAIN CHIMERIC POLYPEPTIDES AND USE THEREOF IN THE TREATMENT OF ADVANCED SOLID TUMORS

1 . A method of treating an unresectable, advanced, recurrent, and/or metastatic solid cancer or solid tumor in a subject, the method comprising administering to the subject two or more doses of a multi-chain chimeric polypeptide, wherein the time between administration of any two consecutive doses of the two or more doses is 15 days to 27 days, wherein the multi-chain chimeric polypeptide comprises:

(a) a first chimeric polypeptide comprising:

(i) a first target-binding domain;

(ii) a soluble tissue factor domain comprising a sequence that is at least 90% identical to SEQ ID NO: 1; and

(iii) a first domain of a pair of affinity domains comprising a sequence that is at least 90% identical to SEQ ID NO:13;

(b) a second chimeric polypeptide comprising:

(i) a second domain of a pair of affinity domains comprising a sequence that is at least 90% identical to SEQ ID NO:11; and

(ii) a second target-binding domain,

wherein:

the first chimeric polypeptide and the second chimeric polypeptide associate through the binding of the first domain and the second domain of the pair of affinity domains; and the first target-binding domain and the second target-binding domain each comprises a soluble TGF-β receptor II (TGF-βRII) and each comprises a sequence that is at least 90% identical to SEQ ID NO:4.

2 . The method of claim 1 , wherein the subject has previously received a previous treatment with a standard first or later line of systemic therapy for a solid tumor, and the subject's solid tumor had recurred or progressed and/or the subject was intolerant to the previous treatment.

3 . The method of claim 1 , wherein the subject has been previous identified or diagnosed as having an unresectable, advanced, recurrent, and/or metastatic solid tumor or unresectable, advanced, recurrent, and/or metastatic solid cancer.

4 . The method of claim 1 , wherein the solid cancer or solid tumor is selected from the group consisting of: bladder cancer, gastric cancer, breast cancer, cervical cancer, colorectal cancer, endometrial cancer, kidney cancer, lip cancer, liver cancer, melanoma, rhabdomyosarcoma, Ewing sarcoma, mesothelioma, lung cancer, non-small cell lung cancer, non-melanoma skin cancer, oral cancer, ovarian cancer, pancreatic cancer, sarcoma, osteosarcoma, glioblastoma, neuroblastoma, small cell lung cancer, thyroid cancer, retinoblastoma, urothelial carcinoma, renal cell carcinoma, esophageal cancer, prostate cancer, squamous cell head and neck carcinoma, hepatocellular cancer, testicular cancer, penile cancer, uterine cancer, vaginal cancer, gallbladder cancer, Merkel cell carcinoma, gastroesophageal junction cancer, microsatellite instability-high (MSI-H) solid tumor, a mismatch repair deficient (dMMR) solid tumor, and tumor mutational burden-high (TMB-H) solid tumor.

5 . The method of claim 1 , wherein the cancer is ovarian cancer, colorectal cancer or liver cancer.

6 . The method of claim 1 , wherein each of the two or more doses is 0.2 mg/kg to 1.3 mg/kg.

7 . The method of claim 1 , wherein each of the two or more doses is 0.25 mg/kg to 1.2 mg/kg.

8 . The method of claim 1 , wherein each of the two or more doses is 20 mg to 150 mg.

9 . The method of claim 1 , wherein the two or more doses are formulated for subcutaneous or intravenous administration.

10 . The method of claim 1 , wherein the first target-binding domain comprises a sequence of SEQ ID NO: 4.

11 . The method of claim 1 , wherein the first chimeric polypeptide comprises a sequence that is at least 80% identical to SEQ ID NO:6.

12 . The method of claim 11 , wherein the first chimeric polypeptide comprises a sequence that is at least 90% identical to SEQ ID NO:6.

13 . The method of claim 12 , wherein the first chimeric polypeptide comprises a sequence of SEQ ID NO:6.

14 . The method of claim 1 , wherein the second target-binding domain comprises a sequence of SEQ ID NO:4.

15 . The method of claim 1 , wherein the second chimeric polypeptide comprises a sequence that is at least 80% identical to SEQ ID NO:5.

16 . The method of claim 15 , wherein the first chimeric polypeptide comprises a sequence that is at least 80% identical to SEQ ID NO:6.

17 . The method of claim 16 , wherein the second chimeric polypeptide comprises a sequence that is at least 90% identical to SEQ ID NO:5.

18 . The method of claim 17 , wherein the second chimeric polypeptide comprises a sequence of SEQ ID NO:5.

19 . The method of claim 18 , wherein the first chimeric polypeptide comprises a sequence of SEQ ID NO:6.