EGFR and glioblastoma: A positive correlation was found between EVI1 and EGFR expressions in each of the GBM series, including GSE2223 (r = 0.429–0.51); GSE4271 (r = 0.379–0.462); GSE23806 (r = 0.445–0.606); and GSE43378 (r = 0.461–0.551) (Supplementary Fig. 1).