In a multivariable cox proportional hazards model, age, extent of resection, MGMT promoter methylation, and interestingly also the PCDHGC3 mRNA expression proved to be independent prognostic factors for the OS of GBM patients (Table 3), while none of the included characteristics were predictive for GBM patients’ PFS (p > 0.05). Here, MGMT is linked to glioblastoma.