ABL1 and precursor B-cell acute lymphoblastic leukemia: ETV6/RUNX1, TCF3/PBX1, KMT2Ar, and BCR/ABL1 fusion genes were frequently detectable in B-ALL patients [8,11], and B-ALL patients with ETV6/RUNX1 experienced favorable prognosis, whereas those patients with KMT2Ar endured poor results.