Treatment utilization trends and outcomes in renal liposarcoma (RLS): A National Cancer Database (NCDB) analysis.

559Background: RLS is an extremely rare neoplasm with only few case reports documented in the literature. Due to the rarity of this disease, level 1 evidence guiding optimal patient management is lacking. Utilizing the NCDB, we analyzed the current treatment patterns and outcomes in patients with RLS in the United States. Methods: The NCDB was queried from 2004- 2015 for patients diagnosed with T1-4N0-1M0 RLS. Baseline patient characteristics were summarized using descriptive statistics. Impact of baseline demographic, clinicopathologic variables and treatment on overall survival (OS) was evaluated using univariate (UV) and multivariable (MV) cox proportional hazards analysis. Results: 136 patients diagnosed with non-metastatic RLS between 2004- 2015 were included in this analysis. Median age at diagnosis was 64.7 years. Males and females had equal preponderance (50% each). 89% (n = 121) were Caucasian, while only 6% were African American. T staging was based on AJCC 8th edition. 20% of patients had T1 di...