[A Case of a Breast Cancer Patient with Cardiac Metastasis].

The patient was a 65-year-old woman who was diagnosed with Stage III A triple-negative breast cancer(T2N2aM0)at the age of 63. AC chemotherapy(3 months)followed by paclitaxel plus bevacizumab(4 months)was administered as neoadjuvant chemotherapy. After chemotherapy, she underwent mastectomy and lymph node dissection. Pathological examination revealed a partial response. After surgery, radiotherapy with a radiation dose of 50 Gy was applied to the chest wall and supraclavicular lymph node. Multiple pulmonary metastases and mediastinal lymph node metastases were diagnosed 23 months after initial treatment, and she was treated with S-1 administration. Two months after S-1 treatment, the PET-CT showed metastasis in the right atrium. Since there were no cardiac symptoms, S-1 treatment was continued without cardiovascular treatment. However, the mediastinal lymph node metastasis progressed; and therefore, S-1 administration was stopped and chemotherapy with eribulin was initiated. Brain metastasis was diagnosed at the same time and treated with a gamma knife. Although chemotherapy with eribulin was continued, the patient died 33 months after initial treatment owing to the brain metastasis. The cardiac metastasis did not progress during chemotherapy with eribulin. There was no sign of heart failure or arrhythmia during the treatment.