The results showed that 12 DEGs (C1S, CFI, DCBLD2, FAM20C, FNDC3B, IFI30, KDELR2, RCAN2, PLP2, SERPINH1, STEAP3, and TNFRSF1A) were significantly correlated with the OS rate of patients with GBM (p < 0.05) (Fig. 5). This evidence concerns the gene C1S and glioblastoma.