Overexpression of the Ecotropic Virus Integration site 1 (EVI1) gene, which has been observed in subsets of patients with acute myeloid leukemia (AML) [1-4], myelodysplastic syndromes (MDS) [5-7], chronic myeloid leukemia (CML) [8-10], and certain solid tumors [11-14], is often associated with poor therapy response and shortened survival [1-4,7,9,11,12,15,16]. Here, RUNX1 is linked to acute myeloid leukemia.