Abstract
Thirty-nine epithelial bladder tumor samples from 37 animals affected with bovine enzootic hematuria (BEH) were selected for immunohistochemical studies. The expression of structural proteins such as uroplakin III (UPIII) and cytokeratin 7 (CK7) and the cell cycle-related proteins cyclin D1 and p53 were evaluated in urothelial papillomas and carcinomas. Loss of UPIII and CK7 expression was seen in both high-grade and high-stage urothelial carcinomas (P < .001 and P < .02). Cyclin D1 expression showed no statistically significant association with grade or stage. In contrast, p53 immunoreactivity was positive in high-grade and high-stage carcinomas (P < .05 and P < .01), confirming its association with the highest malignant behavior of the bladder tumors in BEH.
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