In addition, stereometric analysis performed on histological samples indicated a significantly higher BCRP1-positive cell density in PT tissue than in GBM (p < 0.02; PT: median, 18.1; range, 0.4–95.6; GBM: median, 6.9; range, 0.0–72.1) (Figure 3A,B). This evidence concerns the gene BCRP1 and glioblastoma.