Trends in Treatment Strategies and Comparison of Outcomes in Lymph Node Positive Bladder Cancer: An Analysis of the National Cancer Database

Bladder Cancer
01/09/2020

Urology. 2020 Aug 28:S0090-4295(20)31013-X. doi: 10.1016/j.urology.2020.06.091. Online ahead of print.

ABSTRACT

OBJECTIVE: To utilize a national dataset to compare outcomes and demonstrate trends in treatment for lymph node positive bladder cancer (N+ BC).

METHODS: The National Cancer Database (2006-2014) was queried for cT2-4N1-3M0 N+ BC patients treated with radical cystectomy alone (RC), neoadjuvant chemotherapy (NAC), adjuvant chemotherapy (AC), chemoradiation (CRT), chemotherapy alone (CT), or no definitive treatment (NT). Survival by treatment was analyzed using Kaplan-Meier and multivariable Cox-proportional hazards regression. Pathologic down-staging was analyzed using univariable and multivariable logistic regression models. A univariable logistic regression model of treatment by year identified treatment trends.

RESULTS: Among 3241 patients (cN1, 46%; cN2, 44%; cN3 10%), the majority underwent combined chemotherapy and RC (NAC, 418; AC, 591; RC, 567; CRT, 392; CT, 1068; NT, 205). Overall survival did not differ between NAC and AC, but both had improved survival compared to RC. All other treatment groups had worse survival outcomes compared to NAC. Down-staging to pT0 (adjusted odds ratio [aOR=26.39]) and pN0 (aOR=6.88) was higher for NAC than RC. Utilization of NAC has increased, AC and RC has declined, and CRT and NT is unchanged.

CONCLUSION: Combined chemotherapy and RC demonstrates best survival outcomes for N+ BC, with complete pathologic response to pT0N0 after NAC associated with a 5-year overall survival rate of ∼85%. However, there is no significant difference between NAC and AC. CRT is associated with worse oncologic outcomes compared to RC with perioperative chemotherapy, but improved survival compared to RC or CT.