In our study, in addition to AML-MRC and therapy-related AML, NPM1-A has been also detected in AML without maturation, AML with maturation, acute myelomonocytic leukemia, and acute monoblastic/monocytic leukemia within the category of AML-NOS without significant differences in the incidence among the various subtypes (p=0.50). This evidence concerns the gene CD200 and acute monocytic leukemia.