To prove this hypothesis, we performed an in silico analysis of the expression of NDRG1, together with that of ASCL1 and EGFR, in the three known molecular subgroups of human GBM as available in the GEO dataset GSE4271 (GEO Data Analysis Tools) and in the TCGA dataset (Tumor Glioblastoma-TCGA-540-MAS5.0; R2, Genomics Analysis and Visualization Platform, http://r2.amc.nl) (Fig. 3c). Here, NDRG1 is linked to glioblastoma.