Klein et al. [2] showed that CBF-AML patients in the del(9q) group (n = 104) had a lower CR rate than those in the non-del(9q) group (n = 734) (P = 0.01), while another study [4] showed a good prognosis for children with the t(8;21) AML subgroup with del(9q). Here, CEBPZ is linked to acute myeloid leukemia.