Rigel Pharmaceuticals, Inc. is a biotechnology company that develops and provides therapies for patients with hematologic disorders and cancer in the United States. Its products include TAVALISSE, an oral spleen tyrosine kinase inhibitor for adults with chronic immune thrombocytopenia; REZLIDHIA, a non-intensive monotherapy for adults with relapsed or refractory acute myeloid leukemia (AML) with a susceptible isocitrate dehydrogenase-1 (IDH1) mutation as detected by an FDA-approved test; and GAVRETO, a once-daily oral small molecule kinase inhibitor for adults with metastatic RET fusion-positive non-small cell lung cancer (NSCLC) and for adults and pediatric patients aged 12 and older with advanced or metastatic RET fusion-positive thyroid cancer. The company is also developing R289, an oral IRAK1/4 inhibitor, which is being advanced to a Phase 1b study for hematology-oncology, autoimmune, and inflammatory diseases, as well as for lower-risk myelodysplastic syndrome. It has strategic development collaborations with The University of Texas MD Anderson Cancer Center for olutasidenib in AML and other hematologic cancers with IDH1 mutations, and with the Collaborative Network for Neuro-Oncology Clinical Trial (CONNECT) for a Phase 2 trial of olutasidenib combined with temozolomide in patients with high-grade glioma harboring an IDH1 mutation. Rigel Pharmaceuticals, Inc. was incorporated in 1996 and is headquartered in South San Francisco, California.