Laparoscopic renal cryoablation: Risk factor analysis to predict oncologic outcomes with minimum 5-year follow-up
5094 Background: We analysed risk factors to predict oncologic outcomes at 5–11 year after laparoscopic renal cryoablation (LRC). Methods: Between 09/1997 and 010/2008, we performed renal cryoablation in 340 patients. Of these, 102 patients treated before 10/2003 (all laparoscopic) have minimum 5-year follow-up. Follow-up involved MRI imaging on postoperative day 1, 3 months, 6 months, 12 months, and then annually. Cryolesion biopsy was performed at 6-months. All data were prospectively accrued. Results: In the 102 patients with minimum 5-year follow-up, mean age was 66 years. Mean tumor size was 2.3 cm (0.9–5.0 cm). Median ASA score was 3 and mean BMI was 28. Six patients developed locoregional recurrence, 2 had locoregional recurrence with metastases, and 5 had distant metastases without locoregional recurrence. Overall, there were 7 cancer deaths. In the 69 patients with biopsy-proven renal cell cancer (median follow-up 81 mos; range 60–132 mos), 5-year overall, disease-specific, and disease- free survival was 75%, 92%, and 82%, respectively, while 10-year overall, disease-specific, and disease-free survival was 46%, 83%, and 79%, respectively. On multivariate analysis, previous radical nephrectomy for RCC was the only significant predictor for both recurrence- free survival and cancer-specific survival (p = 0.023 and 0.030, respectively). Relative risk of patients who has a history of radical nephrectomy for RCC treatment was 4.1 (95% CIs, 1.2 to 13.4), and 5.4 (95% CIs, 1.2 to 27.7) for disease-free survival and disease-specific survival, respectively. Conclusions: Laparoscopic renal cryoablation is effective oncologic treatment for renal mass in select patients. Disease-specific survival of 92% at 5-years and 83% at 10-years is possible. Preceding radical nephrectomy for RCC treatment was the only independent predicting factor for both disease-free and disease-specific survival. [Table: see text] No significant financial relationships to disclose.