IDH1 and glioblastoma: Of all gliomas, 1 pilocytic astrocytoma, 1 diffuse astrocytoma with IDH-mutant, 13 diffuse astrocytoma with IDH-wildtype (WT), 3 anaplastic astrocytomas with IDH-mutant, 7 anaplastic astrocytomas with IDH-WT, 3 oligodendrogliomas, NOS, 5 anaplastic oligodendrogliomas, NOS, 5 glioblastomas with IDH-mutant, 26 glioblastomas with IDH-WT, and 12 diffuse midline gliomas with H3 K27M-mutant from the results of IDH1 R132H, IDH2 and H3 K27M IHC staining (Table 1).