Surgery is currently the only potentially curative treatment modality for localized retroperitoneal sarcoma (RPS). Available studies regarding oncologic outcomes are mainly retrospective in nature, and RPS are recognized as a rare disease. Therefore, prospective analysis of high quality data is a top priority. Primary Objectives of this study are: * to prospectively collect standardized clinical data and radiological and pathological material from primary RPS patients treated with surgery at reference centers. * patient outcome will be evaluated in terms of overall survival (OS), disease-free survival (DFS), crude cumulative incidence (CCI) of local recurrence (LR) and distant metastasis (DM). Secondary Objectives: * to estimate the efficacy and safety of surgical treatment, including extended surgical approach to primary RPS; * to prospectively evaluate the impact of multimodality therapy, including radiation therapy and chemotherapy; * to identify clinical, radiological and pathological characteristics that may influence the oncological outcome or may be used as predictors of LR/DM/OS. These may be important biomarkers of disease; * to utilize collected pathological material for research collaborations.
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Disease-free Survival
Timeframe: 10 years