Abstract
Distinction of renal oncocytoma (RO) from chromophobe renal cell carcinoma (ChRCC) is important because their clinical behavior is different. As part of a search for the best available immunohistochemical markers to distinguish ChRCC from RO, we investigated the immunohistochemical profiles of these tumors. We selected 30 renal tumors consisting of ChRCC, typical variant (n = 14), ChRCC, eosinophilic variant (n = 6), and RO (n = 10). Their expression of cytokeratin (CK) 7, KAI1, epithelial-specific antigen (ESA), epithelial-related antigen (ERA), Claudin- 7, and Claudin-8 was studied using an autostainer. Immunoreactivity was assessed based on a combined score of the extent and intensity of staining. Compared to RO, a significantly higher percentage of the total ChRCCs stained positive for CK7 (85% vs. 10%, respectively), KAI1 (90% vs. 10%), ESA (95% vs. 10%), ERA (95% vs. 10%), and Claudin-7 (95% vs. 20%) (P < 0.001). Additionally, there was a significant difference between the percentage of ChRCC eosinophilic variant (ChRCC-E) and RO that stained positive for KAI1 (100% vs. 10%, respectively), ESA (83% vs. 10%), and ERA (83% vs. 10%) (P < 0.001). We recommend immunohistochemical analysis of KAI1, ESA, and ERA to distinguish ChRCC-E from RO.
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Ohe, C., Kuroda, N., Takasu, K. et al. Utility of immunohistochemical analysis of KAI1, epithelial-specific antigen, and epithelial-related antigen for distinction of chromophobe renal cell carcinoma, an eosinophilic variant from renal oncocytoma. Med Mol Morphol 45, 98–104 (2012). https://doi.org/10.1007/s00795-011-0546-3
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DOI: https://doi.org/10.1007/s00795-011-0546-3