COL6A1 and glioblastoma: Eventually, a 12‐PDEARG prognostic signature consisting of MAPK1, ITGA5, NMD3, HEY1, COL6A1, DKK3, SERPINA5, NRP1, PLK2, ANXA1, SLIT2, PDPN was employed to calculate the risk score of GBM samples.