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Immunohistochemistry on tumour-filtrating CD66b+, CD163+, CD8+ and FOXP3+ cells. (A) Expression of CD66b+ cells in normal ducts and ductal cancer in patients with extrahepatic cholangiocarcinoma. (B) Representative pictures of immunohistochemical staining (CD66b, CD8, CD163 and FOXP3) with serial sections in extrahepatic cholangiocarcinoma are shown. (C) Representative cases with intratumoural exclusive expression patterns of CD66b+ and CD8+ cells.
