Expression of several protooncogenes, encoding transcription factors (MYC, MYB, and FOS) and tyrosine kinases (ABL1, FES, KIT, and PIM) with essential roles in the regulation of hematopoiesis, cell proliferation, differentiation, cell cycle, and apoptosis was demonstrated in AML cells extracted from patients [31–34]. The gene discussed is KIT; the disease is acute myeloid leukemia.