1. Department of Breast Oncology, International Medical Center Saitama Medical University, Hidaka, Saitama 350‑1298, Japan
2. Department of Breast Oncology, Saitama Medical University Hospital, Moroyama‑machi, Saitama 350‑0495, Japan
3. Department Palliative Medicine, International Medical Center Saitama Medical University, Hidaka, Saitama 350‑1298, Japan