Study of IRX5183 in Relapsed and Refractory Acute Myeloid Leukemia and High Risk Myelodysplastic Syndrome

IRX5183 will be administered orally daily on days 1-28 of each cycle for 2 cycles of induction. In the phase I part of the study, there will be 3 dose levels (dose level 1 \[DL1\] with 50 mg, DL2 with 75 mg, and DL3 with 100 mg), with 1 additional dose level to be only used if excessive toxicity noted at the DL1. There will be no intra-patient dose escalation. A phase II portion of the study was originally planned, but the study was terminated prior to phase II enrollment.