Body mass index and survival of patients with metastastic renal cell carcinoma: Data from the German prospective RCC registry.

454 Background: Being overweight is a known risk factor for developing renal cell carcinoma (RCC). On the other hand, overweight patients may harbor a less aggressive type of disease. A recent meta-analysis was able to demonstrate that a high preoperative BMI was an independent prognostic indicator for better overall survival in patients with RCC. We present data on the prognostic impact of the postoperative BMI, at the start of systemic treatment in patients with advanced or metastatic RCC (mRCC). Methods: The German RCC registry is a prospective, longitudinal, multicenter study conducted by a network of 133 office-based medical oncologists in Germany to document treatment of unselected patients with mRCC. Based on the inclusion criteria for this analyses we identified 475 prospectively documented patients who received 1st-line systemic treatment. Patients were grouped by their BMI and overall survival was estimated by Kaplan-Meier analysis. A multivariate cox proportional hazards model was used to deter...