...we evaluated the effect of multiple menin inhibitors and effective drug combinations for the treatment of KMT2A-rearranged infant leukemia….Within the panel of menin inhibitors, infant B-ALL cells were found to be more sensitive to MI-463, MI-503 and MI-136 with a mean IC50 of 5.9µM, 6.1µM and 10.2µM, respectively....In this study, we present and discuss the initial proof-of-concept preclinical data for the effective anti-leukemic activity of menin inhibition against KMT2A-rearranged infant leukemia cells.