<qa>  What was the goal of the present study?Up to date, there was sparse data on surgical outcome and prognostic factors of survival after radical nephrectomy and thrombectomy in an Asian population with RCC and venous tumor thrombus, while most studies have been performed in Western countries. The aim of the present study was to address the surgical outcome after radical nephrectomy with thrombectomy and to evaluate the prognostic factors influencing on survival in Korean patients with RCC and tumor thrombus extension into renal vein or IVC, labeled as T3a and T3b-c by the newly revised 2009 AJCC TNM staging system, respectively. 