IDH2 and central nervous system cancer: Using these data allowed definition of five molecular subgroups of glioma: triple-positive (IDH mutated, 1p/19q co-deletion, TERT promoter mutated); TERT-IDH (IDH mutated, TERT promoter mutated, 1p/19q-wild-type); IDH-only (IDH mutated, 1p/19q wild-type, TERT promoter wild-type); TERT-only (TERT promoter mutated, IDH wild-type, 1p/19q wild-type) and triple-negative (IDH wild-type, 1p/19q wild-type, TERT promoter wild-type).