1 Karin Ribi, International Breast Cancer Study Group Coordinating Center, Bern, Switzerland; Jürg Bernhard, International Breast Cancer Study Group Coordinating Center; and Bern University Hospital, Inselspital, Bern, Switzerland; Weixiu Luo, International Breast Cancer Study Group Statistical Center, Dana-Farber Cancer Institute, Boston, MA; Meredith M. Regan, International Breast Cancer Study Group Statistical Center, Dana-Farber Cancer Institute; and Harvard Medical School, Boston, MA; Gini F. Fleming, The University of Chicago Medical Center and Alliance for Clinical Trials in Oncology, Chicago, IL; and Prudence A. Francis, Peter MacCallum Cancer Center, St Vincent's Hospital, University of Melbourne, Melbourne; and University of Newcastle, Newcastle, NSW, Australia.