FLT3-ITD mutation was rarely found in AML patients with higher counts of CD45dimCD34+CD38−CD133+ cells (≥10%) than in patients with fewer CD45dimCD34+CD38−CD133+ cells (< 10%) (0% vs. 23.1%, respectively, P = 0.031). The gene discussed is FLT3; the disease is acute myeloid leukemia.