FLT3 and acute myeloid leukemia: A subset of AML cells expresses a mutated form of the class III receptor tyrosine kinase FLT3 (Fms-Like Tyrosine kinase-3; STK-1, human Stem Cell Tyrosine Kinase-1; or FLK-2, Fetal Liver Kinase-2) [4], which has inspired the development of a number of small molecule inhibitors of mutant FLT3.