Fig. 1

PD-L1 expression is upregulated in FTC tissues and cell lines. a The expression of PD-L1 in tumor and adjacent normal tissues was examined by IHC staining. b Comparison of PD-L1 expression between tumor and adjacent normal tissues. c The levels of PD-L1 protein in FTC-133 and Nthy-ori 3–1 cells were detected by Western blot. d The expression levels of PD-L1 mRNA in FTC-133 and Nthy-ori 3–1 cells were examined by RT–qPCR. * p < 0.05, ** p < 0.01, *** p < 0.001