Silence or inhibition of YAP1 lessenes PD-L1 expression in SW480 and HCT116 cells. A. SW480 and HCT116 cells were exposed to siNC or YAP1 siRNA for 48 h, the protein expression of PD-L1 was detected by western blot. B. SW480 and HCT116 cells were respectively treated with 0, 1, 2 and 4 mM VP for 48 h, protein analysis of PD-L1 by western blot. Data were presented as means ± S.D. (n=3), *P < 0.05.