Expression of cadherin-6 as a novel diagnostic tool to predict prognosis of patients with E-cadherin-absent renal cell carcinoma.


In many carcinomas, E-cadherin is considered to be a prognostic marker for patient survivals, and its decreased expression is associated with metastatic disease. Among renal cell carcinomas (RCCs), however, only 20% of tumors express E-cadherin, whereas a much higher percentage express other cadherins, e.g., N-cadherin and cadherin-6 (T. Shimazui et al, Cancer Res., 56: 3234-3237, 1996). Among these cadherins expressed in RCCs, cadherin-6 has been identified as a major cadherin in the renal proximal tubules and in the tumors themselves. Hence, we have investigated the relationship between prognosis and cadherin-6 expression in tumor cells in 43 patients with RCC. Expression of cadherin-6, E-cadherin, and alpha-catenin was detected immunohistochemically and evaluated microscopically as normal, heterogeneous, or absent. Normal, heterogeneous, and absent expression of cadherin-6 were observed in 19, 16, and 8 of 43 cases, respectively. Coexpression of E-cadherin and cadherin-6 was detected in only 10 cases. Among 30 tumors in which E-cadherin expression was absent, 24 expressed cadherin-6. In addition, the expression pattern of alpha-catenin correlated more highly with that of cadherin-6 than it did with E-cadherin (P = 0.0003 versus 0.025). In survival analyses, aberrant expression of cadherin-6 correlated with poor survivals both among all patients (P = 0.0009) and in those with E-cadherin-absent RCC (P = 0.0008). These results suggest that cadherin-6 is a major cadherin playing an essential role in cell-cell adhesion in E-cadherin-absent RCC.

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@article{Shimazui1998ExpressionOC, title={Expression of cadherin-6 as a novel diagnostic tool to predict prognosis of patients with E-cadherin-absent renal cell carcinoma.}, author={Toru Shimazui and Egbert Oosterwijk and Hideyuki Akaza and P. P. Bringuier and E. T. G. Ruijter and Hans van Berkel and J O Wakka and Adrie van Bokhoven and Frans M. J. Debruyne and Jack Antonius Schalken}, journal={Clinical cancer research : an official journal of the American Association for Cancer Research}, year={1998}, volume={4 10}, pages={2419-24} }