Tailoring Adjuvant Endocrine Therapy for Premenopausal Breast Cancer

Prudence A Francis¹, Olivia Pagani¹, Gini F Fleming¹+34

• ¹From the Peter MacCallum Cancer Centre, St. Vincent's Hospital, University of Melbourne, Melbourne, VIC, and Breast Cancer Trials Australia and New Zealand, University of Newcastle, Newcastle, NSW (P.A.F.), and the University of Sydney, Sydney (A.S.C.) - all in Australia; the Institute of Oncology of Southern Switzerland, Ospedale San Giovanni, Bellinzona (O.P.), Breast Cancer St. Gallen, St. Gallen (T.R.), and the International Breast Cancer Study Group Coordinating Center (R.M., M.R.-P., B.R., A.S.C.), University Hospital Inselspital (M.R.-P.), Bern - all in Switzerland; the University of Chicago Medical Center, Chicago (G.F.F.); the University of Calgary, Calgary, AB, Canada (B.A.W.); the Division of Medical Senology, European Institute of Oncology (M.C.), and the European Institute of Oncology and International Breast Cancer Study Group (A.G.), Milan, Ospedale Papa Giovanni XXIII, Bergamo (C.T.), Azienda Socio Sanitaria Territoriale Sette Laghi-Ospedale di Circolo and Fondazione Macchi, Varese (G.P.), Medical Oncology and Cancer Prevention, IRCCS, National Cancer Institute, Aviano (F.P., S.S.), the Department of Medicine, School of Medical Oncology, University of Udine, Udine (F.P.), Salvatore Maugeri Foundation, Pavia (L.P.), and the Hospital of Prato-Azienda Unità Sanitaria Locale Toscana Centro, Prato (A.D.L.) - all in Italy; the National Institute of Oncology, Budapest, Hungary (I.L.); Instituto Nacional de Enfermedades Neoplásicas, Lima, Peru (H.L.G.); University Hospital 12 de Octubre, Madrid (E.C.), Vall d'Hebron Institute of Oncology and Vall d'Hebron University Hospital, Barcelona (M.B.), and Instituto Valenciano de Oncologia, Valencia (M.A.C.) - all in Spain; the Susan F. Smith Center for Women's Cancers (H.J.B., E.P.W.) and the International Breast Cancer Study Group Statistical Center, Department of Biostatistics and Computational Biology (R.D.G., M.M.R.), Dana-Farber Cancer Institute, Harvard Medical School, the Harvard T.H. Chan School of Public Health, and Frontier Science and Technology Research Foundation (R.D.G.) - all in Boston; Institut Bergonié Comprehensive Cancer Center, Université de Bordeaux, Bordeaux, France (H.R.B., M.D.); the Angeles Clinic and Research Institute, Santa Monica, CA (S.M.); Massey Cancer Center, Virginia Commonwealth University School of Medicine, Richmond (C.E.G.); Mayo Clinic, Rochester, MN (M.P.G., J.N.I.); Johns Hopkins Sidney Kimmel Comprehensive Cancer Center, Baltimore (V.S.); Fred Hutchinson Cancer Research Center, University of Washington, Seattle (N.E.D.); Weston Park Hospital, Sheffield, United Kingdom (R.C.); and the Department of Obstetrics and Gynecology, University Medical Center, Regensburg, Germany (S.B.).