| Summary: | We describe a case of the first successful treatment of platinum refractory clear cell ovarian cancer with secondary cytoreductive surgery and placement of Calypso transponders to facilitate post-operative volumetric arc radiation therapy. In the setting of both primary and recurrent disease, patients with clear cell ovarian cancer are less responsive to standard chemotherapy and those treated with radiation therapy may have improved outcomes compared to the use of other treatment modalities. Volumetric arc radiation therapy with implantable transponders is feasible, and allows for the targeted treatment of sites of metastatic disease while limiting toxicity to surrounding structures and can be considered for patients with recurrent ovarian cancer and oligometastatic disease. Keywords: Clear cell carcinoma, Ovarian carcinoma, Pelvic radiation, Volumetric arc therapy
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