Salvage Systemic Therapy With or Without Stereotactic Ablative Radiotherapy for Recurrent Ovarian Cancer

Treatment Plan Arm 2; SABR Number of Fractions Preferred Doses Acceptable Doses 1 20 Gy 16-24 Gy 3 30 Gy 24-33 Gy 5 35 Gy 25-40 Gy 10 40 Gy 35-45 Gy Patient Evaluation: * Interviews * It was performed 3, 6, 9, 12, 18, 24, 30, and 36 months after the end of treatment. * Medical history listening, physical examination and assessment of all possible side effects * The relevant examination can be prescribed if necessary. * Imaging examination * one of CT or PET-CT including areas suspected of recurrence or treatment is possible. * If PET-CT was not performed within two months before treatment, it is recommended to perform PET-CT before treatment NOTE: Before treatment, it is recommended to perform the same examination as the imaging test that evaluated the treatment site. * Tumor marker CA125 examination: performed on every visit after radiation therapy. * Survey EORTC-QLQ-C30 questionnaire; prior to radiation therapy, 12, 24, and 36 months after treatment FACIT-TS-G (Arm 2 subjects); before radiation therapy, 12, 24, and 36 months after treatment.