CD274 and colorectal cancer: An increase in PD-L1 expression was also observed with RSV and one of its metabolites, piceatannol (3′,4′,3,5-tetrahydroxystilbene), in human breast cancer (BT549, SKBR3), invasive ductal carcinoma (BT474), and colorectal cancer (HT29, SW480, SW60, HCT116) cells [52].