Marco Moschini1, Shahrokh F Shariat2, Roberta Lucianò3, David D'Andrea2, Beat Foerster2, Mohammad Abufaraj2, Marco Bandini4, Paolo Dell'Oglio2, Rocco Damiano5, Andrea Salonia4, Francesco Montorsi4, Alberto Briganti4, Renzo Colombo4, Andrea Gallina4. 1. Unit of Urology/Division of Oncology, IRCCS Ospedale San Raffaele, Urological Research Institute, Milan, Italy; Department of Urology, Magna Graecia University of Catanzaro, Catanzaro, Italy; Department of Urology, Medical University of Vienna, Vienna, Austria. Electronic address: marco.moschini87@gmail.com. 2. Department of Urology, Medical University of Vienna, Vienna, Austria. 3. Department of Pathology, Ospedale San Raffaele, Milan, Italy. 4. Unit of Urology/Division of Oncology, IRCCS Ospedale San Raffaele, Urological Research Institute, Milan, Italy. 5. Department of Urology, Magna Graecia University of Catanzaro, Catanzaro, Italy.
Abstract
PURPOSE: To evaluate the impact of pure and mixed histologic variant versus pure urothelial carcinoma in nonmetastatic bladder cancer (BCa) patients treated with radical cystectomy (RC). PATIENTS AND METHODS: We evaluated data from 1067 patients treated with RC and pelvic lymph node dissection between 1990 and 2013 at a single institution tertiary-care referral center. All specimens were evaluated by dedicated uropathologists. Univariable and multivariable Cox regression analyses tested the impact of the presence of pure and mixed histologic variants versus pure urothelial on recurrence, cancer-specific mortality, and overall mortality after accounting for all available confounders. RESULTS: In total, 201 (19%) and 137 (13%) patients were found with mixed and pure variants at RC, respectively. Mixed preponderant variants were sarcomatoid, lymphoepitelial, squamous, and glandular; small-cell and micropapillary variants were found mostly as pure variants. With a median follow-up of 6.5 years, patients who harbored pure variant were found by multivariable analyses to have lower survival outcomes compared to pure urothelial carcinoma (all P < .01). Conversely, no differences were found between mixed variant versus pure urothelial by multivariable Cox regression analyses predicting recurrence, cancer-specific mortality, and overall mortality (all P > .1). CONCLUSION: The presence of histologic variants at RC is a common finding, accounting for approximately 30% of specimens. In this setting, the presence of a pure variant but not the presence of mixed variant with urothelial carcinoma is related to a detrimental effect on survival outcomes after RC.
PURPOSE: To evaluate the impact of pure and mixed histologic variant versus pure urothelial carcinoma in nonmetastatic bladder cancer (BCa) patients treated with radical cystectomy (RC). PATIENTS AND METHODS: We evaluated data from 1067 patients treated with RC and pelvic lymph node dissection between 1990 and 2013 at a single institution tertiary-care referral center. All specimens were evaluated by dedicated uropathologists. Univariable and multivariable Cox regression analyses tested the impact of the presence of pure and mixed histologic variants versus pure urothelial on recurrence, cancer-specific mortality, and overall mortality after accounting for all available confounders. RESULTS: In total, 201 (19%) and 137 (13%) patients were found with mixed and pure variants at RC, respectively. Mixed preponderant variants were sarcomatoid, lymphoepitelial, squamous, and glandular; small-cell and micropapillary variants were found mostly as pure variants. With a median follow-up of 6.5 years, patients who harbored pure variant were found by multivariable analyses to have lower survival outcomes compared to pure urothelial carcinoma (all P < .01). Conversely, no differences were found between mixed variant versus pure urothelial by multivariable Cox regression analyses predicting recurrence, cancer-specific mortality, and overall mortality (all P > .1). CONCLUSION: The presence of histologic variants at RC is a common finding, accounting for approximately 30% of specimens. In this setting, the presence of a pure variant but not the presence of mixed variant with urothelial carcinoma is related to a detrimental effect on survival outcomes after RC.
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