COL4A2 and glioblastoma: Interestingly, we have identified several genes that were present in both independent gene sets, namely, CAV1, PTGS2, PLXDC1, and COL4A2. To determine whether the resulting genes could serve as prognostic markers for patient survival, we stratified patients with GBM from an independent cohort (AVAglio + RTOG 0825) according to the transcriptome expression of the corresponding gene 25, 27.