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On 26 March 2019, the US Food and Drug Administration (FDA) granted a Breakthrough Therapy Designation to ivosidenib, a first-in-class, oral, selective inhibitor of mutations in isocitrate dehydrogenase-1 (IDH1), in combination with azacitidine, for the treatment of patients with newly diagnosed IDH1-mutant acute myeloid leukemia (AML). This comes after ivosidenib received FDA approval in July 2018 for the treatment of patients with IDH1-mutant relapsed/refractory AML.
The Breakthrough Therapy Designation for ivosidenib and azacitidine was based on the results from a phase I/II study, which were presented at the Acute Leukemias XVII Biology and Treatment Strategies biennial symposium. In the ivosidenib and azacitidine arm, the overall response rate was 78%, with a complete response rate of 57%. Moreover, the median duration of response in the ivosidenib and azacitidine arm was not reached (95% CI, 7.7–not reached).
According to the drug manufacturers, the combination of ivosidenib and azacitidine for patients with newly diagnosed AML “has the potential to be a compelling treatment option”, because at present in the front-line setting there are “no approved options specifically for patients with an IDH1 mutation.”
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