The recurrent or refractory ovarian cancer tends to recur repeatedly at increasingly short intervals, making treatment more and more difficult.Patients often have limited physical capacity to undergo repeated systematic treatment. Currently, NCCN（ national comprehensive cancer network ）guidelines recommend palliative radiotherapy in patients with local recurrence of ovarian cancer. With the progress of IMRT（ intensity modulated radiation therapy ）, SBRT ( stereotactic body radiation therapy ) and other radiotherapy technologies, better local tumor control rate can also be achieved, while minimizing the damage to surrounding normal tissues. In this study, the patients will be divided into groups according to their wishes: group A (drug therapy alone), group B (radiotherapy alone), and group C (radiotherapy plus drug therapy).The researchers sought to explore the the efficacy and safety of involving field radiotherapy in the oligo-metastatic/recurrent/refractory ovarian cancer patients in different groups after treatment by inviting multiple centers to participate in the study.
