Most recurrent somatic mutations recently evidenced in myeloid malignancies, including myelodysplastic syndromes (MDS), myeloproliferative neoplasms (MPN), and acute myeloid leukemias (AML), affect genes implicated in the regulation of gene expression (RUNX1, TEL/ETV6, TP53, TET2, ASXL1, EZH2, IDH1/2, DNMT3A). Here, IDH1 is linked to myeloproliferative neoplasm.