In contrast, early T-cell precursor lymphoblastic leukemia (ETP-ALL) harbors mutations commonly found in myeloid tumors, including alterations in FLT3, DNMT3A, NRAS, KRAS, IDH1, or IDH2, all of which are genetically rare in classical T-ALL/LBL [23]. The gene discussed is IDH2; the disease is acute lymphoblastic leukemia.