F-star Therapeutics, Inc., a clinical-stage biopharmaceutical company develops tetravalent bispecific antibodies for cancer therapy. Its medicines are used in immuno-oncology treatments. The company's principal product candidate is FS118, is currently being evaluated in a proof-of-concept Phase 2 trial in PD-1/PD-L1 acquired resistance head and neck cancer patients. It is also developing first-in-human clinical study of FS222, a bispecific antibody targeting CD137 (4-1BB) and PD-L1. The company was incorporated in 2002 and is headquartered in Cambridge, the United Kingdom.