IDH1 and glioblastoma: The cohort included a total of 94 diffuse gliomas: 17 Grade II–III IDH1 wild type (IDH1wt), 28 Grade II–III IDH1 mutant (IDH1mut), 25 Grade IV (glioblastoma, GBM) IDH1wt, and 24 Grade IV IDH1mut.