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Immunohistochemical staining of intestinal-type adenocarcinoma, papillary subtype. a CK20 is seen in most tumor cells, b CDX-2 stains all tumor nuclei, c CK7 is variably positive in tumor cells, d chromogranin A is seen in occasional neuroendocrine cells. Peroxidase conjugated ABC Kit (Dako) ×400
