[Predictive value of a questionnaire for epidemiologic studies]

Combined surgical treatment was carried out in 29 cases of non-organ retroperitoneal tumors due to extensive involvement of adjacent organs. Postoperative mortality was 3.4 +/- 3.3%. Three-year survival was 51.2 +/- 10.3% and 5-year survival-47.1 +/- 10.10%.