IL6 and cancer: Immune-related pathways including TNFA-signaling-via-NFKB, IFN-γ response, IFN-α response, inflammatory response, IL6-JAK-STAT signaling, IL2-STAT5 signaling, and complement and allograft-rejection pathways are significantly enriched during high PSMB9 expression in almost all cancer types analyzed, suggesting that PSMB9 could be correlated to interactions between tumor and immune cells.