IL13RA2 and mesenchymal cell neoplasm: Consistent with these findings, for the limited set of tumors with reported subtype classification (Verhaak training set n=161; Phillips n=77), mesenchymal tumors also express higher levels of IL13Rα2 (1.68-fold; p = 0.00015 for Verhaak [6]; 2.44-fold, p = 0.028 for Phillips [5]) than do proneural tumors (Figure S4 in File S1).