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RNF2 (ring finger protein 2) is frequently overexpressed in several types of human cancer, but the status of  RNF2  amplification and expression in urothelial carcinoma of the bladder (UCB) and its clinical/prognostic significance is unclear. In this study, immunohistochemical analysis and fluorescence  in situ  hybridization (FISH) were used to examine the expression and amplification of  RNF2  in 184 UCB patients after radical cystectomy. Overexpression of RNF2 was observed in 44.0% of UCBs and was found to significantly associate with shortened overall and cancer-specific survival ( P  < 0.001). In different subsets of UCBs, RNF2 overexpression was also identified as a prognostic indicator in patients with pT1, pT2, pN(−), and/or negative surgical margins ( P  < 0.05). Importantly, RNF2 overexpression together with pT status and surgical margin status provided significant independent prognostic parameters in multivariate analysis ( P  < 0.01). FISH results showed amplification of  RNF2  in 8/79 (10.1%) of informative UCB cases. Additionally, RNF2 overexpression was significantly associated with  RNF2  gene amplification ( P  = 0.004) and cell proliferation ( P  = 0.003). These findings suggested that overexpression of RNF2, as examined by immunohistochemical analysis, might serve as a novel prognostic biomarker and potential therapeutic target for UCB patients who undergo radical cystectomy.

Overexpression of RNF2 Is an Independent Predictor of Outcome in Patients with Urothelial Carcinoma of the Bladder Undergoing Radical Cystectomy