Department of Surgery, Division of Breast and Endocrine Surgery, Hyogo College of Medicine, Mukogawa-cho 1-1, Nishinomiya, Hyogo, 663-8501, Japan. ymiyoshi@hyo-med.ac.jp. Eisai Co., Ltd., Koishikawa, Bunkyo-ku, Tokyo, Japan. Eisai Inc., Woodcliff Lake, NJ, USA. Division of Breast Surgical Oncology, Department of Surgery, Showa University, Hatanodai, Shinagawa-ku, Tokyo, Japan. Department of Breast Oncology, International Medical Center, Saitama Medical University, Yamane, Hidaka, Saitama, Japan. Division of Breast Oncology, Shizuoka Cancer Center, Shimonagakubo, Nagaizumi-cho, Sunto-gun, Shizuoka, Japan. IOB Institute of Oncology, Quironsalud Group, Madrid, Barcelona, Spain. Medica Scientia Innovation Research (MedSIR), Barcelona, Spain. Breast Cancer Group, Vall D'Hebron Institute of Oncology (VHIO), Barcelona, Spain.