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From the question on page 644

Histopathological examination of the surgical specimen showed an intraluminal polypoid colonic malignancy. The tumour cells had bland, oval nuclei, fine chromatin and prominent nucleoli (figure 1). Immunohistochemical studies showed tumour cells stained for calretinin, cytokeratin 5/6, vimentin (figure 2), monoclonal mouse anti-human mesothelial …