IDH1 and glioblastoma: In an exploratory analysis of the TCGA glioblastoma database, considering 143 patients with available genomic and transcriptomic data and IDH1/2 wildtype tumors, the expression levels of CD99 were not significantly associated with OS (log-rank test p = 0.912) nor with PFS (p = 0.0785; q-value = 0.235) (Figure 4).