The qRT-PCR results showed that the expression of PTEN in glioma tissues was significantly lower than that in normal tissues (Fig. 7A), and the Kaplan–Meier curve showed that the expression level of PTEN was positively correlated with OS among glioma patients (Fig. 7B), which was consistent with the results of previous research [26]. This evidence concerns the gene PTEN and central nervous system cancer.