F-star Therapeutics, Inc. is a clinical-stage biopharmaceutical firm dedicated to inventing tetravalent bispecific antibodies for the treatment of cancer, particularly within the field of immuno-oncology. The company's primary investigational product, FS118, is currently in a Phase 2 proof-of-concept trial, evaluating its efficacy in head and neck cancer patients who have acquired resistance to PD-1/PD-L1 therapies. F-star is also advancing FS222, a bispecific antibody designed to simultaneously target the costimulatory CD137 receptor and the inhibitory PD-L1 ligand, through its initial Phase 1 human clinical study.