Surgery is the usual treatment for retroperitoneal sarcomas that can be removed. However, in some patients, the cancer comes back. In this study, researchers want to see if giving radiation therapy before surgery is better than surgery alone for reducing the risk of cancer recurrence and to see if radiation can shrink the tumor before surgery. They will also be comparing the side effects of radiation therapy plus surgery with surgery alone.
Patients in this study will be randomly assigned to receive radiation therapy (five days a week for six to seven weeks) followed by surgery, or surgery alone. The two groups will then be compared with regard to treatment effectiveness and side effects.