ABL1 and acute lymphoblastic leukemia: The distribution and frequencies of CNAs were generally consistent with those from other study cohorts in the whole series, as well as across genetic subgroups, with the highest CNA frequency in BCR::ABL1pos (80% CNA) and BCR::ABL1-like subgroups (83% CNA), intermediate in NEG B-ALL (69% CNA), while the lowest in patients with MLL rearrangements [2,33].