Abstract
BackgroundVinflunine is the only chemotherapeutic agent shown to improve survival in platinum-refractory patients with metastatic transitional cell carcinoma of the urothelium (TCCU) in a phase III clinical trial, which led to product registration for this indication in Europe. The aim of this study was to assess the efficacy of vinflunine and to evaluate the prognostic significance of risk factors in a large, unselected cohort of patients with metastatic TCCU treated according to routine clinical practice.MethodsThis was a retrospective multicenter study. Italian cancer centers were selected if, according to the Registry of the Italian Medicines Agency (AIFA), at least four patients had been treated with vinflunine between February 2011 and June 2014, after first- or second-line platinum-based chemotherapy. The primary objective was to test whether the efficacy measured by overall survival (OS) in the registration study could be confirmed in routine clinical practice. Multivariate analysis was carried out using Cox proportional hazard model.ResultsA total of 217 patients were treated in 28 Italian centers. Median age was 69 years (IQR 62–76) and 84% were male; Eastern Cooperative Oncology Group performance status (ECOG PS) was ≥ 1 in 53% of patients. The median number of cycles was 4 (IQR 2–6); 29%, 35%, and 36% received an initial dose of 320 mg/m2, 280 mg/m2 or a lower dose, respectively. Median progression-free survival (PFS) and OS for the entire population was 3.2 months (2.6–3.7) and 8.1 months (6.3–8.9). A complete response was observed in six patients, partial response in 21, stable disease in 60, progressive disease in 108, with a disease control rate of 40%. Multivariate analysis showed that ECOG PS, number of metastatic sites and liver involvement were unfavorable prognostic factors for OS. Toxicity was mild, and grade 3–4 adverse effects were mainly: neutropenia (9%), anemia (6%), asthenia/fatigue (7%) and constipation (5%).ConclusionsIn routine clinical practice the results obtained with VFL seem to be better than the results of the registration trial and reinforce evidence supporting its use after failure of a platinum-based chemotherapy.
Highlights
Vinflunine is the only chemotherapeutic agent shown to improve survival in platinum-refractory patients with metastatic transitional cell carcinoma of the urothelium (TCCU) in a phase III clinical trial, which led to product registration for this indication in Europe
Patient characteristics and clinical history A total of 217 patients with metastatic Transitional cell carcinoma of the urothelium (TCCU) progressing after failure of a previous platinum-based chemotherapy from 28 centers were enrolled in this study
All patients received at least one platinum-based regimen for metastatic disease prior to vinflunine; 122 (56%) were treated with cisplatin, 91 (42%) with carboplatin plus gemcitabine, and 4 patients were treated with other platinum combinations
Summary
Vinflunine is the only chemotherapeutic agent shown to improve survival in platinum-refractory patients with metastatic transitional cell carcinoma of the urothelium (TCCU) in a phase III clinical trial, which led to product registration for this indication in Europe. It is estimated that approximately 27,000 new cases of urothelial bladder cancer are diagnosed every year in Italy [2]. About 50% of patients will relapse following surgery; the 5-year survival rate is approximately 60%, and 25–35% in high-risk patients (stages T3–4 and/or N+) [3, 4]. A platinum-based chemotherapy is the standard front-line treatment in the metastatic setting. Response rates are initially high, with about 50% reported in phase III trials, the majority of responding patients develop progressive disease within 8 months [5,6,7]
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