Survival Outcomes in Patients With Muscle-Invasive Bladder Cancer Receiving Neoadjuvant Chemotherapy Stratified by Number of Cycles

Introduction: The ≥3 cycles of neoadjuvant cisplatin-based chemotherapy (NAC) are commonly administered to treat MIBC. However, some patients are unable to complete all planned cycles of NAC. Prognosis of patients receiving <3 cycles of NAC has yet to be elucidated. Methods: This retrospective single-center study quantifies pathologic complete response (pT0N0), recurrence-free survival (RFS), and 5-year overall survival (OS) in patients treated with <3 cycles of NAC compared to ≥3 cycles. Patients with MIBC between 2004 and 2018 receiving at least 1 cycle of cisplatin-based NAC were included. Exclusion criteria were metastasis before initiation of NAC, progression/death during NAC. Patient characteristics were compared using chi-square tests, Fisher's exact tests, and Wilcoxon rank sum tests. Kaplan Meier curves, log-rank tests, and Cox proportional hazards models compared RFS adjusting for patient age, ECOG status, GFR, stage, node positivity, and NAC regimen. 5-year OS was analyzed via logistic regression with the aforementioned patient characteristics in the cohort of patients with 5 years of follow-up, unless deceased prior. Results: In a cohort of 256 patients, the median RFS was 11.6 months (95% CI 7.79, 28.5) versus 79.5 months (95% CI 62.13, NA) in those receiving ≥3 cycles of NAC. Of 228 patients with documented pathologic stage, complete pathologic response (pT0) was observed in 9.4% of patients receiving <3 cycles, and 27.0% of patients receiving ≥3 cycles of NAC (P =.008). In 195 patients with a minimum of 5 years of follow-up, patients with <3 cycles the 5-year OS was 13.3% with <3 cycles compared to 53.3% with ≥3 cycles of NAC. Conclusions: In this retrospective, single-center investigation, early cessation of planned NAC was associated with worse pCR rate, RFS, and OS. While further prospective evaluation is required to confirm causality, clinicians should prioritize administering at least 3 cycles of NAC when feasible to optimize outcomes.