The ORR for patients with IDH2-R140 mutations was 35.4% (95% CI, 27.2%-44.2%) and for those with IDH2-R172 mutations, ORR was 53.3% (95% CI, 37.9%-68.3%). Rates of complete remission were 17.7% (95% CI, 11.6%-25.4%) in patients with IDH2-R140 mutations and 24.4% (95% CI, 12.9%-39.5%) for patients with IDH2-R172 mutations....In conclusion, data from this study showed that single-agent enasidenib was well tolerated, induced hematologic responses, and was associated with a median survival of more than 9 months in patients with relapsed or refractory mutant-IDH2 AML.