IKZF1 and acute lymphoblastic leukemia: In contrast to high hyperdiploid cells, deletion of IKZF1 was not linked to prednisolone resistance in primary BCR-ABL1-like and B-other ALL cells, suggesting that additional factors (e.g. differentiation stage, other oncogenic drivers) are important for the functional effect of a deletion of the IKZF1 gene in these type of cells.