In other AML types, ddPCR has been used at diagnosis for distinguishing between two “not otherwise specified” (NOS) forms: the expression levels of the ANXA3 and S100A9 genes were increased, whereas those of WT1 were decreased in the AML-M2 (according to the previous FAB classification) in respect of AML-M1. The gene discussed is S100A9; the disease is acute myeloid leukemia.