IDH1 and oligodendroglioma: In sum, 39 IDH1/2-mutant and 1p/19q-codeleted oligodendrogliomas (IDH-mut codel), 39 IDH1/2-mutant astrocytomas (IDH-mut non-codel), 39 IDH1/2-wildtype astrocytomas (IDH-wt), 6 IDH1/2-mutant glioblastomas (GBM IDH-mut), and 39 IDH1/2-wildtype glioblastomas (GBM IDH-wt) were included.