Pharmacokinetic and Safety Study of MRX-2843 in Adolescents and Adults With Relapsed/Refractory AML, ALL, or MPAL

This is a Phase I, open-label, non-randomized, dose escalation study in up to 50 adolescent or adult patients with relapsed/refractory acute myeloid leukemia, acute lymphoblastic leukemia, or mixed phenotype acute leukemia. Patients will receive a single dose of MRX-2843 followed by continuous oral MRX-2843 in 28 day cycles at predefined dose cohorts. A dose expansion arm of approximately 12 patients (with 6 patients being FLT3 ITD+ and 6 patients being Mer+/FLT3 WT) will be accrued to further evaluate patients at the RP2D.