In the last 3 years, alone mutations in the genes TET2, IDH1, IDH2, DNMT3a, and EZH2 have all been found in patients with myeloproliferative neoplasms (MPNs), myelodysplastic syndromes (MDSs), and/or acute myeloid leukemia (AML). This evidence concerns the gene TET2 and acute myeloid leukemia.