[Turner N] Breast Unit, The Royal Marsden NHS Foundation Trust, London SW3 6JJ, UK. Breast Cancer Now Research Centre, The Institute of Cancer Research, London, UK. [Dent RA] Division of Medical Oncology, National Cancer Centre Singapore, Singapore, Singapore. [O'Shaughnessy J] Department of Medical Oncology, Texas Oncology, Baylor University Medical Center, US Oncology, Dallas, TX, USA. [Kim SB] Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea. [Isakoff SJ] Division of Hematology and Oncology, Massachusetts General Hospital, Boston, MA, USA. [Barrios C] Latin American Cooperative Oncology Group, Oncology Research Service, Hospital São Lucas, PUCRS, Porto Alegre, RS, Brazil. [Oliveira M] Servei d’Oncologia Mèdica, Vall d’Hebron Hospital Universitari, Barcelona, Spain. Vall d’Hebron Institute of Oncology (VHIO), Barcelona, Spain