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    Flexible fibre optic vs digital ureteroscopy and enhanced vs unenhanced imaging for diagnosis and treatment of upper tract urothelial carcinoma (UTUC): Results from the Clinical Research Office of the Endourology Society (CROES)-UTUC registry
    (Wiley, 2021) Soria, Francesco; del Pilar Laguna Pes, Maria; Roupret, Morgan; Garcia-Marchinena, Patricio; Sebastian Gonzalez, Mariano; Habuchi, Tomonori; Erkan, Erkan; Ng, Anthony; Gontero, Paolo; de la Rosette, Jean J. M. C. H.
    Objectives To compare the oncological outcomes of patients with upper tract urothelial carcinoma (UTUC) undergoing kidney-sparing surgery (KSS) with fibre-optic (FO) vs digital (D) ureteroscopy (URS). To evaluate the oncological impact of image-enhancement technologies such as narrow-band imaging (NBI) and Image1-S in patients with UTUC. Patients and Methods The Clinical Research Office of the Endourology Society (CROES)-UTUC registry is an international, multicentre, cohort study prospectively collecting data on patients with UTUC. Patients undergoing flexible FO- or D-URS for diagnostic or diagnostic and treatment purposes were included. Differences between groups in terms of overall survival (OS) and disease-free survival (DFS) were evaluated. Results The CROES registry included 2380 patients from 101 centres and 37 countries, of whom 401 patients underwent URS (FO-URS 186 and D-URS 215). FO-URS were performed more frequently for diagnostic purposes, while D-URS was peformed when a combined diagnostic and treatment strategy was planned. Intra- and postoperative complications did not differ between the groups. The 5-year OS and DFS rates were 91.5% and 66.4%, respectively. The mean OS was 42 months for patients receiving FO-URS and 39 months for those undergoing D-URS (P = 0.9); the mean DFS was 28 months in the FO-URS group and 21 months in the D-URS group (P < 0.001). In patients who received URS with treatment purposes, there were no differences in OS (P = 0.9) and DFS (P = 0.7). NBI and Image1-S technologies did not improve OS or DFS over D-URS. Conclusions D-URS did not provide any oncological advantage over FO-URS. Similarly, no differences in terms of OS and DFS were found when image-enhancement technologies were compared to D-URS. These findings underline the importance of surgeon skills and experience, and reinforce the need for the centralisation of UTUC care.