Our current study combined IDH1/2 mutated tumors with either 1p/19q codeletion or TERTp mutation as IDHmut-OT gliomas since both of the markers were closely associated with oligodendroglial differentiation with the presence of IDH1/2 mutation [19, 20, 23, 25, 26]. The gene discussed is IDH1; the disease is central nervous system cancer.