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Analysis of rectal tumor by immunohistochemistry. a Photomicrograph showing moderately differentiated tubular adenocarcinoma mainly in the submucosal layer without serosal exposure (hematoxylin and eosin stain, ×12.5). b–d Immunohistochemical staining showed the tumor cells are positive for cytokeratin 20 and negative for cytokeratin 7 and caudal-type homeobox 2
