1. From the International Breast Cancer Study Group, Oncology Institute of Southern Switzerland, Lugano, and Zentrum für Tumordiagnostik und Prävention, St Gallen, Switzerland; European Institute of Oncology, Milan, Italy; University of Pennsylvania Cancer Center, Philadelphia, PA; Department of Biostatistical Science, Dana-Farber Cancer Institute, Boston, MA; and Australian Cancer Society and University of Sydney, East Sydney, Australia.