Short Course Radiation Treatment for Patients With Primary or Locally Recurrent Retroperitoneal Sarcoma Prior to Surgery

In this study, patients will receive a hypofractionated course of radiation therapy of 2.85 Gy x 15 fractions (42.75 Gy). If there are 2 or more patients with dose-limiting toxicities, the radiation course will be de-escalated to 2.7 Gy x 15 fractions (40.5 Gy).

This group is receiving hypofractionated radiation therapy (shorter course of RT)