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Squamous and glandular differentiation in urothelial bladder carcinomas. Histopathology, histochemistry and immunohistochemical expression of carcinoembryonic antigen.

This paper reports the immunochemical expression of carcinoembryonic antigen in the squamous, glandular and mixed differentiation areas observed in 190 urothelial urinary bladder carcinomas. The antigen was found to occur in 75% and 81% of all papillary and solid infiltrating carcinomas, respectively. The use of the immunohistochemical determination of CEA in improving the morphological examination of these differentiation areas and their scant presence in the prognosis of urothelial carcinomas involving squamous and/or glandular focal differentiation are discussed.