A 57-year-old female was admitted for right breast tumor. Modified radical mastectomy (Kodama method) was carried out. A prophylactic postoperative radiation was undertaken because of large tumor (T4b) and histologic metastasis to a Rotter's lymph node. At the end of irradiation, bilateral lung metastases were found on chest CT gram. The combination endocrine chemotherapy using MPA 600 mg and UFT 3 capsules p.o. daily and ADM 10 or 20 mg i.v. every two weeks was performed on an outpatient basis. As the lung metastases were increased four months later, carboplatin 150 mg i.v. was replaced with ADM. Four months later, the metastases almost disappeared on CT gram. These results suggested the possibility of one of the therapeutic options for metastatic breast cancer.