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Orbital metastasis from breast cancer is relatively uncommon and is not the dominant prognosis. While it can reduce a patient's QOL through symptoms such as diplopia, visual impairment, and exophthalmos, evidence suggests that radiotherapy might improve these symptoms in a relatively short period. We report 3 cases of orbital metastasis from breast cancer treated with radiotherapy. All 3 patients were diagnosed with stage Ⅳ breast cancer and underwent chemotherapy and endocrine therapy for several years. When they were diagnosed with or