We confirmed previously reported associations between BCP-ALL and IKZF1 at 7p12.2 (refs 5, 6), ARID5B at 10q21.2 (refs 5, 6), CEBPE at 14q11.2 (ref. 6), BMI1-PIP4K2A at 10p12.31-12.2 (refs 7,10,18), CDKN2A at 9p21.3 (ref. 8) and TP63 at 3q28 (ref. 9) (Supplementary Table 1). This evidence concerns the gene IKZF1 and acute lymphoblastic leukemia.