A comprehensive comparison of fluorescence in situ hybridization and cytology for the detection of upper urinary tract urothelial carcinoma: A systematic review and meta-analysis

OBJECTIVE: To compare the relative effectiveness of fluorescence in situ hybridization (FISH) and cytology in diagnosing upper urinary tract urothelial carcinoma (UUT-UC) and to evaluate the advantages and potential deficiencies of FISH analysis. METHODS: We performed a complete systematic review based on studies from PubMed/Medline, Embase, Web of Science, Ovid, Web of Knowledge, and Cochrane Library. We identified 2031 patients with strict criteria in 14 individual studies between January 2005 to November 2017 in accordance to preferred reporting items for systematic reviews and meta-analysis (PRISMA) guidelines, we summarized the test performance using bivariate random effects models. RESULTS: FISH was superior to cytology in terms of pooled sensitivities (84.0%, 95% confidence interval [CI] 74.4–90.5% vs 40.0%, 95% CI 33.6–46.7%). FISH and cytology were similar to each other in terms of pooled specificities, which were 89.5% (95% CI 85.3–92.6%) for FISH and 95.9% (95% CI 91.2–98.1%) for cytology. CONCLUSION: We confirm the superiority of FISH over cytology in terms of sensitivity and find similar diagnostic outcomes between them based on systematic analysis. Therefore, we demonstrate that FISH is extremely sensitive while still very reliable with a relatively low error rate for diagnosing UUT-UC.