PBX1 and acute lymphoblastic leukemia: ‐ B‐ALL cells of different genotypes were used, including murine (Ph+ GFP+), human (EVT6‐RUNX1 REH, MLL RS(4;11), E2A‐PBX1 697, E2A‐HLF UOCB1, and NALM‐6, Ph+ SUP‐B15) and patient‐derived (Ph+ B‐ALL blasts and non‐Ph+ B‐ALL blasts) B‐ALL cells.