The median number of genomic aberrations in newly diagnosed and recurrent IDH-mt astrocytoma was 4 (IQR: 3.5–6) and 5.5 (IQR: 3.5–8.25), respectively, and that of oligodendroglioma was 5 (IQR: 4–8) and 5 (IQR: 3.5–5.75), respectively. This evidence concerns the gene IDH1 and oligodendroglioma.