KIT and acute myeloid leukemia: However, RUNX1-ETO expression requires additional co-operating mutations in KIT, FLT3, RAS, ASXL1, and ZBTB7A, -9q, or –Y for the complete leukemic transformation of cells, and consistent with this idea, additional chromosomal aberrations are detected in almost 70% of t(8;21)-positive AML [21].