KMT2A and precursor B-cell acute lymphoblastic leukemia: We compared these to four other leukemias: NUTM1-rearranged infant B-ALL (n = 1), KMT2A-rearranged infant AML (n = 1), megakaryoblastic neonatal AML (n = 1) and childhood ETV6-RUNX1 B-ALL (a common subtype of standard-risk childhood B-ALL; n = 1) (Supplementary Table 3).