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  • Title: Oncologic Outcomes for Patients with Residual Cancer at Cystectomy Following Neoadjuvant Chemotherapy: A Pathologic Stage-matched Analysis.
    Author: Bhindi B, Frank I, Mason RJ, Tarrell RF, Thapa P, Cheville JC, Costello BA, Pagliaro LC, Karnes RJ, Thompson RH, Tollefson MK, Boorjian SA.
    Journal: Eur Urol; 2017 Nov; 72(5):660-664. PubMed ID: 28545841.
    Abstract:
    UNLABELLED: While it has been demonstrated that receipt of neoadjuvant chemotherapy (NAC) before radical cystectomy (RC) improves survival compared to RC alone, the driving factor for this benefit may be from patients with ypT0 status at surgery. Meanwhile, the implications of having residual urothelial carcinoma of the bladder (rUCB) at RC after NAC are less clear. We therefore evaluated whether survival differed between patients with rUCB at RC after NAC and stage-matched controls who underwent RC alone. Patients who underwent NAC + RC (n = 180) were matched to controls who underwent RC alone (n=324) on the basis of pT and pN stage, margin status, and year of RC. The 5-yr recurrence-free survival (RFS; 90% vs 94%; p=1), cancer-specific survival (CSS; 82% vs 93%; p=0.4), and overall survival (OS; 82% vs 82%; p=0.5) were not significantly different between the NAC and control groups for patients with ypT0N0/pT0N0 disease (n=103). Conversely, among patients with rUCB at RC (n=401), patients who received NAC had significantly worse 5-yr RFS (50% vs 63%; p=0.01), CSS (40% vs 59%; p=0.003), and OS (33% vs 48%; p=0.02). On multivariable analysis for patients with rUCB, NAC receipt remained independently associated with worse RFS (hazard ratio [HR] 1.84, 95% confidence interval [CI] 1.28-2.66; p=0.001), CSS (HR 1.81, 95% CI 1.30-2.52; p<0.001), and OS (HR 1.57, 95% CI 1.18-2.08; p=0.002). Limitations include potential for selection bias owing to the retrospective observational design. Thus, while patients who achieve a complete response to NAC have excellent survival outcomes, those with rUCB after NAC have a worse prognosis compared to stage-matched controls undergoing RC alone. It may be worthwhile considering these patients for clinical trials evaluating the role of additional treatments after RC using newer agents while we await further research on predicting which patients achieve ypT0 status from NAC before RC. PATIENT SUMMARY: On surgical removal of the bladder, patients without residual bladder cancer after neoadjuvant chemotherapy have excellent survival outcomes. However, patients with residual cancer after neoadjuvant chemotherapy and surgery have worse outcomes compared to patients undergoing surgery alone. These patients should therefore be considered for additional treatments after surgery using newer agents while we await further research on predicting which patients will benefit from neoadjuvant chemotherapy before bladder removal for cancer.
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