CDK1 and oligodendroglioma: Figure 8 demonstrates the Kaplan-Meyer survival curves in GBM, astrocytoma WHO grades II-III, and oligodendroglioma WHO grades II-III for CDC2 gene expression and CDC2 copy number. Data on ependymomas was not available. Numerical data associated with these graphs are presented in Table 2. In the GBM and the astrocytoma group, CDC2 gene amplification was associated with increased survival (log ranked P-value = .029 for each group), whereas CDC2 amplification did not significantly lead to increased survival in the oligodendroglioma group (log ranked P-value = .86).