Although the frequency of high expression IL2RA cases was also low in APL (2 out of 63, Additional file 1: Table S8) and in all favourable-risk cases in our study, the frequency of high IL2RA mRNA expression cases in CBF AML (16.7%) was not significantly different from that in intermediate-risk and poor-risk AML. Here, CEBPZ is linked to acute promyelocytic leukemia.