MGMT and glioblastoma: The results of the stereometric analysis clearly showed that the cell density of MGMT-negative cells was higher in tumor samples compared to the PT area (p < 0.0001, two-sample Wilcoxon rank-sum, Mann–Whitney test; PT: median, 52.1; range, 0.54–92.4; GBM: median, 10.2; range, 0.0–76.5) (Figure 2A).