IDH1 and astrocytoma (excluding glioblastoma): Interestingly, 10/79 (12.7%) STS had IDH-mutant gliomas, of whom 6 were reclassified as astrocytoma, IDH-mutant and 4 as oligodendroglioma, IDH-mutant, 1p/19q-codeleted according to WHO 2016.