Recently, it has been shown that CDKN2A homozygous deletion was associated with poorer outcome among IDH-mutant gliomas lacking 1p/19q codeletion (IDH-mutant astrocytoma) as well as among anaplastic oligodendrogliomas, IDH-mutant-1p/19q codeleted [3]. This evidence concerns the gene IDH1 and anaplastic oligodendroglioma.