To explore the biological processes correlated with PSMB9 expression, we defined the top and the bottom 30% PSMB9 expression subgroups in each cancer type as high and low-PSMB9 subgroups, respectively, and performed a differential expression analysis between the high and low-PSMB9 subgroups in each cancer type with the differential expression genes (DEGs) located (Supplemental Table S2). The gene discussed is PSMB9; the disease is cancer.