RAPT Therapeutics, Inc., a clinical-stage immunology-based biopharmaceutical company, focuses on discovery, development, and commercialization of oral small molecule therapies for patients with unmet needs in oncology and inflammatory diseases in the United States. The company's lead inflammation drug candidate is zelnecirnon (RPT193), a C-C motif chemokine receptor 4 (CCR4) antagonist that selectively inhibit the migration of type 2 T helper cells into inflamed tissues. Its lead oncology drug candidate is tivumecirnon (FLX475), an oral small molecule CCR4 antagonist that is in the Phase 1/2 clinical trial to investigate as a monotherapy and in combination with pembrolizumab in patients with advanced cancer. The company was formerly known as FLX Bio, Inc. and changed its name to RAPT Therapeutics, Inc. in May 2019. RAPT Therapeutics, Inc. was incorporated in 2015 and is headquartered in South San Francisco, California.