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Purpose CD10, a membrane-bound zinc-dependent metallopeptidase, is normally expressed in many tissues. Accordingly, the derangement of CD10 expression may be related to development or progression in a variety of tumors. The aim of this study is to examine any association between CD10 expression and clinicopathological parameters in bladder transitional cell carcinomas (TCCs) and the relationship between expression of E-cadherin and CD10. Materials and Methods Immunohistochemical staining was performed for CD10 and E-cadherin in tissues of 94TCCs and 10 non-neoplastic bladder mucosa. Results Positive immunoreactivity for CD10 was observed in non-neoplastic urothelium at a proportion of 80% and TCCs were observed at a rate of 23%. A positive rate of CD10expression was observed in 10% of total cases of a low grade tumor and in 35% of those of a high grade tumor. It was also observed in 15% of pTa tumors, 13% of pT1 tumors, and 48%of pT2 tumors. In addition, CD10 expression showed reciprocal correlation with expression of membranous E-cadherin in tumors. Conclusion CD10 is again expressed at a certain stage during the neoplastic process of TCCs and could play some roles intheir carcinogenesis.