An Open-Label Extension Study to Evaluate Safety and Efficacy of Pazopanib in Patients with Advanced Renal Cell Carcinoma

Abstract

Objectives: Evaluation of the safety and efficacy of pazopanib, a multikinase angiogenesis inhibitor, in a single-arm, open-label, extension study (VEG107769/NCT00387764) for placebo-treated patients with advanced renal cell carcinoma (RCC) from a randomized, double-blind, placebo-controlled phase III study (VEG105192/NCT00334282). Methods: Patients received pazopanib 800 mg/day. The primary endpoint was the safety and tolerability of pazopanib treatment. Secondary endpoints included response rate per Response Evaluation Criteria in Solid Tumors, progression-free survival (PFS), and overall survival (OS). Results: Seventy-nine placebo-treated patients from VEG105192/NCT00334282 who experienced disease progression and one pazopanib-treated patient (an exemption) were enrolled. Forty-one patients (51%) were treatment-naive; 39 (49%) were cytokine-pretreated. Median exposure to pazopanib was 9.7 months. All patients had discontinued pazopanib at the time of analysis. The most common reason for discontinuation was disease progression (61%). The most common adverse events were hypertension (45%), diarrhea (45%), hair color changes (44%), anorexia (30%), and nausea (25%). The response rate was 37.5% [95% confidence interval (CI): 26.9-48.1]; median PFS was 9.2 months (95% CI: 7.3-12.0); median OS was 23.5 months (95% CI: 16.3-28.0). Conclusions: Efficacy and safety profiles for pazopanib in this extension study of patients with RCC previously treated with placebo were very similar to those observed for pazopanib-treated patients in the pivotal phase III study.