Moreover, according to the 2016 and 2021 WHO classification of CNS tumours [46, 47], gliomas have been classified as IDH1 wild-type (GBM), IDH1 mutations with chromosome 1p19q codeletions (LGG), and IDH1 mutations without chromosome 1p19q codeletions (LGG). This evidence concerns the gene IDH1 and glioma.