The expression of ETV2 in high-grade glioma was also confirmed in freshly dissected clinical samples (GBM grade III–IV, n = 9; meningioma, n = 1; skeletal muscle, n = 1) by reverse transcriptase PCR (RT-PCR) and western blotting, as shown in Fig. S1. Here, ETV2 is linked to glioblastoma.