WM1119 completely inhibited the proliferation of P31/FUJ cells, while it slowed down proliferation (but failed to induce complete differentiation) of MLL translocation-induced leukemia cell lines (i.e., HB1119, MV4-11, and MonoMac-6) and Nucleophosmin mutation (NPMc)-bearing leukemia cells (i.e., OCI-AML3) at 10 μM (Fig. 5b and Supplementary Fig. 6a). This evidence concerns the gene KMT2A and leukemia.