Pre-operative Hypofractionated Proton Therapy

Inclusion Criteria: * Adult patients (≥18 years of age) * Patients with primary or locally recurrent extremity or truncal soft tissue sarcoma * WHO/ECOG status ≤2 Exclusion Criteria: * History of prior local radiation therapy * Inability to tolerate treatment position for duration of simulation or treatment * Tumor originating in retroperitoneal location * Patients planned for systemic therapy including chemotherapy, targeted agents, and immunotherapy * Co-existing malignancy or treated malignancy in the last 2 years expected to limit life expectancy; does not include completely resected cutaneous basal cell carcinoma, squamous cell carcinoma, in situ breast or cervical malignancies, or other pathologies at the discretion of the investigators. * Confirmed pregnancy.