IL13RA2 and neoplasm: Consistent with the PCA and silhouette analyses, IL13Rα2 expression shows the strongest positive correlation with average tumor mesenchymal signature gene expression (Verhaak: r=0.41, p<10-20; Phillips: r=0.41, p<10-20), and shows almost no or negative correlation with average tumor proneural signature gene expression (Verhaak: r=0.065, p=0.018; Phillips: r= −0.072; r=0.0093) (Figure 2E and 2F).