The original histological diagnoses of the TERT-mutated-1p/19q intact (IDH-mutated) group included various histological types and contained fewer pure oligodendroglial tumors (9 out of 24 cases), while most TERT-wildtype-1p/19q codeleted tumors were histologically diagnosed as pure oligodendroglial tumors (5 out of 6 cases) (Additional file 1: Table S1). The gene discussed is IDH1; the disease is oligodendroglial tumor.