CD274 and neuroendocrine carcinoma: We found that 29% of acinar PCs, 7% of ductal PCs, and 46% of neuroendocrine carcinomas or tumors were classified as PD-L1-positive by immunohistochemical analysis on tumor tissue, despite these results may be influenced by some selection biases [8,9,11,12,13,17,21,27,29,32,35,36,37,38,39,41,42,43,44,50,51,52,53,54,55,57,59,60,61,62,66,67,74,75,77,78,79,83,84,85,89,90,92,93,94,98,99,100,111,112,120,154].