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Immunohistochemical findings. Immunohistochemistry for CA19-9 (a), CEA (b), MUC-1 (c), and CA125 (d). Magnification, × 40 and × 200. Note strong expression of CA19-9, CEA, and MUC-1 in the cytoplasm and membrane of cholangiocarcinoma cells. CA125 expression in the cytoplasm of cholangiocarcinoma cells is weak and partial. Scale bar 500 μm and 50 μm. CA19-9, carbohydrate antigen 19-9; CEA, carcinoembryonic antigen; MUC-1, cell surface-associated mucin 1; CA125, cancer antigen 125
