PROton Therapy for Post Surgical Treatment of GYNecologic Cancer

The study intervention is Whole Pelvis (WP) Pencil Beam Scanning Proton Radiation (PBS PRT) as part of the definitive treatment of gynecologic cancers in the post-hysterectomy, adjuvant setting. Patients will be treated with doses of 45 or 50.4 Gy in 1.8 Gy daily fractions. The volume treated will include the whole pelvis according to Radiation Therapy Oncology Group post-hysterectomy pelvis guidelines.