PSMD2 and glioblastoma: We also compared the relative expression levels of PSMD members in GBM using the GEPIA2 database and found that the mRNA expression level of PSMD2 and PSMD8 was higher than that of the other PSMD family members, and the mRNA expression level of PSMD5 was the lowest among all 14 PSMD members (Figure 1C).