In another study, 166 patients with chronic-phase MPN (77 PMF, two post-PV myelofibrosis, two post-ET myelofibrosis, 47 ET, and 38 PV) and 34 blast-phase MPN were screened for IDH1 and IDH2 mutations [15]. The gene discussed is IDH1; the disease is myeloproliferative neoplasm.