LAUSR

4582Background: To evaluate the long term oncologic efficacy and overall survival of radiofrequency ablation (RFA) for pathologically proven T1a Renal cell carcinoma (RCC). Methods: we retrospectively reviewed our renal ablation data base between January 2001 and December 2014, we included only patients with histologically diagnosed T1a RCC ( < 4 cm) who underwent RFA. Patient who underwent cryoablation, those with syndromes,and those with recurrent or bilateral RCC were excluded. For each patient, we recorded: Demographics, tumor size and histology, complications, recurrence at ablation site, development of metastases, history of another malignancy, survival/death and cause of death. Overall survival (OS) was estimated using Kaplan and Meier product-limit estimator. Results: Ninety four RFA procedures were performed for 92 lesions in 92 patients (54 males and 38 females, average age 68 years). Average tumor size was 2.7cm (range: 1-3.9 cm). The median follow-up for all subjects was 4.7 years (range: 0.16...