Neoadjuvant chemotherapy plus radical cystectomy versus radical cystectomy alone in clinical T2 bladder cancer without hydronephrosis

Bladder Cancer
06/11/2020

BJU Int. 2020 Nov 5. doi: 10.1111/bju.15289. Online ahead of print.

ABSTRACT

OBJECTIVES: To assess the efficacy of neoadjuvant chemotherapy (NAC) before radical cystectomy (RC) in a retrospective multicenter patient cohort of patients with cT2N0M0 BCa without preoperative hydronephrosis.

MATERIALS AND METHODS: This was a propensity-based analysis of 619 patients. Of these, 316 were treated with NAC followed by RC and 303 with upfront RC. After multiple imputations, inverse probability of treatment weighting (IPTW) was used to account for potential selection bias. Multivariable logistic regression analysis was performed to evaluate the impact of NAC on pathologic complete response and downstaging at RC, while IPTW-adjusted Kaplan-Meier curves and Cox regression models were built to evaluate the impact of NAC on overall survival (OS).

RESULTS: After IPTW-adjusted analysis, standardized differences between groups were less than 15%. A complete response (pT0N0) at final pathology was achieved in 94 (30%) patients receiving NAC and 9 (3%) patients undergoing upfront RC. Downstaging to non-muscle invasive disease (<pT2N0M0) was observed in 174 (55%) patients after NAC and in 72 (24%) patients without NAC. On multivariable analysis, NAC was found to be an independent predictor of both pathologic complete response and downstaging. No significant difference with respect to OS was observed between groups with a median follow-up of 18 months.

CONCLUSIONS: In patients with cT2N0 BCa and no preoperative hydronephrosis, NAC increased the rate of pathologic complete response and downstaging.