Rigel Pharmaceuticals announced that the U.S. Food and Drug Administration (FDA) has approved REZLIDHIA™ (olutasidenib) capsules for the treatment of adult patients with relapsed or refractory (R/R) acute myeloid leukemia (AML) with a susceptible isocitrate dehydrogenase-1 (IDH1) mutation as detected by an FDA-approved test. REZLIDHIA is an oral, small molecule, inhibitor of mutated IDH1 designed to bind to and inhibit mIDH1 to reduce 2-hydroxyglutarate levels and restore normal cellular differentiation of myeloid cells.
The FDA approval was supported by data from the open-label Phase 2 registrational study evaluating REZLIDHIA monotherapy at a dose of 150 mg twice daily in 153 mIDH1 R/R AML patients. The efficacy-evaluable population was 147 patients who initiated REZLIDHIA at least six months prior to the interim analysis cutoff date of June 18, 2021, and who had a centrally confirmed IDH1 mutation. The primary endpoint was a composite of a complete remission (CR) plus a complete remission with partial hematological recovery (CRh). CRh is defined as less than 5% blasts in the bone marrow, no evidence of disease, and partial recovery of peripheral blood counts (platelets >50,000/microliter and absolute neutrophil count >500/microliter).