Maybe, oligoastrocytomas (WHO grade II/III) may be separated into two groups, genetically matching oligodendroglioma on one and astrocytoma on the other side based on the molecular information, for example, IDH1/2, 1p/19q and ATRX and so on [27, 28]. This evidence concerns the gene IDH1 and astrocytoma (excluding glioblastoma).