1. Department of Palliative Medicine, National Cancer Center Hospital , Tokyo , Japan
2. Department of Breast Surgery, Kansai Medical University , Osaka , Japan
3. Department of International Clinical Development, National Cancer Center Hospital , Tokyo , Japan
4. Japan Clinical Oncology Group (JCOG) Data Center, National Cancer Center Hospital , Tokyo , Japan
5. Department of Minimally Invasive Surgical and Medical Oncology, Fukushima Medical University , Fukushima , Japan
6. Departments of Breast and Endocrine Surgery, Okayama University Hospital , Okayama , Japan
7. Department of Medical Oncology, Kyorin University Faculty of Medicine , Tokyo , Japan
8. Department of Biostatistics, Clinical Research Center, Shizuoka Cancer Center , Shizuoka , Japan
9. Department of Radiation Oncology, St. Marianna University School of Medicine , Kawasaki , Japan
10. Division of Supportive Care , Survivorship and Translational Research, Institute for Cancer Control, National Cancer Center, Tokyo , Japan
11. Division of Biostatistics, Tohoku University Graduate School of Medicine , Sendai , Japan
12. Department of Advanced Medicine, University Hospital , Nagoya , Japan
13. JCOG Data Center/Operations Office, National Cancer Center , Tokyo , Japan
14. Department of Medical Oncology and Hematology , Cancer Center, , Kobe , Japan
15. Kobe University Hospital , Cancer Center, , Kobe , Japan