CD274 and neoplasm: The accuracy of PD-L1 expression on tumor and inflammatory cells (cutoff value, 10%) according to the biopsy method was as follows: ERCP, 89% (25/28) and 68% (19/28); FNA, 86% (6/7) and 43% (3/7); and liver biopsy, 100% (10/10) and 100% (10/10), respectively.