Calithera Biosciences, Inc. is a clinical stage precision oncology biopharmaceutical company, which engages in developing targeted therapies to redefine treatment for biomarker-specific patient populations. It also focuses on researching small molecule oncology compounds with a biomarker-driven approach that targets genetic vulnerabilities in cancer cells to deliver new therapies for patients suffering from aggressive hematologic. The company was founded by James A. Wells and Susan M. Molineaux on March 9, 2010 and is headquartered in South San Francisco, CA.