Rigel Pharmaceuticals Inc
A South San Francisco biotechnology company that develops and sells prescription medicines for blood disorders and cancer. Its FDA-approved drugs include Tavalisse for immune thrombocytopenia (a low blood-platelet condition) and Rezlidhia for a form of acute myeloid leukemia. Founded in 1996, the company shares its name with Rigel, a brilliant blue star in the Orion constellation whose Arabic name means "the foot of the giant."