IDH1 and glioma: The pass-filter TCGA-glioma cohort was composed of 166 glioma/glioblastoma, IDH-wildtype (IDHwt), 140 astrocytoma, IDH-mutant, 1p/19q-non-codeleted (IDH-A), and 123 oligodendroglioma, IDH-mutant, 1p/19q-codeleted (IDH-O) cases33.