Curis, Inc. announced that the U.S. Food and Drug Administration (FDA) has removed the partial clinical hold on the TakeAim Leukemia Phase 1/2 study of emavusertib. Further, the recommended phase 2 dose (RP2D) for emavusertib as a monotherapy has been established at 300 mg BID in patients with Acute Myelogenous Leukemia (AML) or Myelodysplastic Syndromes (MDS). On April 4, 2022, the Company announced that the FDA placed a partial clinical hold on the TakeAim Leukemia study.

On August 30, 2022, the Company announced that the FDA notified Curis that it may resume enrollment of additional patients in the monotherapy dose finding phase of the TakeAim Leukemia study, so that the Company could enroll at least nine additional patients at the 200 mg BID dose level. On July 6, 2023, the Company announced the FDA had removed the partial clinical hold on the TakeAim Leukemia study and that the RP2D has been established at 300 mg BID. In the TakeAim Leukemia study, as of the March 17, 2023 data cutoff for patients dosed prior to February 9, 2023, 84 patients received emavusertib monotherapy, ranging from doses of 200 mg to 500 mg BID.

Significant blast count reductions have been observed across all patient groups, regardless of dose level, mutation status, or number of prior lines of treatment. Emerging from these data are two genetically-defined subpopulations of relapsed/refractory (R/R) patients who have demonstrated compelling responses in monotherapy: AML patients with FLT3 mutation and AML patients with spliceosome mutation (U2AF1 or SF3B1 mutation) who have received <= 2 prior lines of treatment. In these subpopulations of evaluable patients (patients whose disease has been determined to be evaluable for objective response with baseline and post-treatment marrow assessments) treated with 300 mg BID, 2 of 3 patients with a FLT3 mutation achieved a CR (Complete Response), and 2 of 3 patients with spliceosome mutation achieved a CR or CRh (Complete Response with Partial Hematologic Recovery).

The duration of response for these patients ranged from 5.6 to 7.0 months.