Because TP53 mutations in IDH mutant gliomas were indicative of a poor prognosis and as +7q, +8q, −9p, and −11p were frequently observed in IDH mutant gliomas with TP53 mutations, we hypothesized that these CNAs were associated with a poor prognosis in patients with IDH mutant gliomas. This evidence concerns the gene IDH2 and glioma.