National Cancer Center Hospital - Department of Breast and Medical Oncology, Keio University - Department of Clinical Pharmacokinetics and Pharmacodynamics, Toranomon Hospital - Department of Medical Oncology, Fukushima Medical University, Yokohama City University, National Cancer Center Hospital - Department of Breast and Medical Oncology, National Hospital Organization Hokkaido Cancer Center - Department of Breast Surgery, Showa University - Advanced Cancer Translational Research Institute, Kumamoto Shinto General Hospital, Tokyo-West Tokushukai Hospital, Seirei Sakura Citizen Hospital, University of Texas at Houston - MD Anderson Cancer Center, RIKEN Center for Integrative Medical Sciences, RIKEN Center for Integrative Medical Sciences, National Cancer Center Hospital - Department of Breast and Medical Oncology and Keio University - Department of Clinical Pharmacokinetics and Pharmacodynamics