Based on the molecular characteristics, particularly isocitrate dehydrogenase (IDH) status, adult-type diffuse gliomas are categorized into glioblastoma (IDH-wildtype), astrocytoma (IDH-mutant), and oligodendroglioma (IDH-mutant and 1p/19q-codeleted) [1]. This evidence concerns the gene IDH1 and astrocytoma (excluding glioblastoma).