A case of breast cancer with metastasis of multiple organs showing marked efficacy of medroxyprogesterone acetate (MPA)

The patient, a 55-year-old female, was diagnosed as having right breast cancer (T1aN2M1, Stage IV) with metastasis of multiple organs (lung, pleura, bone, mediastinal and unilateral axillary lymph nodes) when she underwent tumorectomy. Postoperative adjuvant therapy was performed using oral administration of MPA (800 mg/day). After 3 months of this treatment, metastatic lesions in the lung and pleura had disappeared. After 37 months, complete remission (CR) was evaluated in the multiple lesions of bone metastasis. She achieved a complete remission (CR) by this treatment lymph nodes metastasis in both mediastinum after 24 months and unilateral axillae after 15 months. Complete response time was 38 months in both lung and pleura, 15 months in bone metastasis, 15 months in mediastinal lymph nodes, 24 months in unilateral ones. Normalization of tumor markers was acquired after 7 months of this hormonal therapy. This CR condition continues at present without severe complications.