Kaplan-Meier curves for univariate analysis. High SSTR2 expression correlated with better prognosis in both of grade II to IV glioma (A, our data, P < 0.001; C, CGGA RNAseq, P < 0.001; E, TCGA RNAseq, P < 0.001; log-rank test) and grade III to IV glioma (B, our data, P = 0.042; D, CGGA RNAseq, P < 0.001; F, TCGA RNAseq, P < 0.001; log-rank test).