Hormone therapy use and young-onset breast cancer: a pooled analysis of prospective cohorts included in the Premenopausal Breast Cancer Collaborative Group

Katie M. O’Brien, Melissa G House, Mandy Goldberg, Michael E. Jones, Clarice R. Weinberg, Amy Berrington de González, Kimberly A. Bertrand, William J. Blot, Jessica Clague DeHart, Fergus J. Couch, Montserrat García‐Closas, Graham G. Giles, Victoria A. Kirsh, Cari M. Kitahara, Woon‐Puay Koh, Hannah Lui Park, Roger L. Milne, Julie R. Palmer, Alpa V. Patel, Thomas E. Rohan, Minouk J. Schoemaker, Anthony J Swerdlow, Lauren R. Teras, Celine M Vachon, Kala Visvanathan, Jian‐Min Yuan, Wei Zheng, Hazel B. Nichols, Dale P. Sandler