BIRC6 and acute promyelocytic leukemia: Since a hallmark of AML is a differentiation block of hematopoietic precursors at different developmental stages and since this block can be overcome by treating acute promylocytic leukemia (APL) patients with all-trans retinoic acid (ATRA) and low dose chemotherapy, we also analyzed the role of BIRC6 during neutrophil differentiation of AML cells.