Bellet, Meritxell, Gray, Kathryn, Gonzales-Martin, Antonio, Ferrer, Roser, Catalan, Roberto, Azaro, Analia, Rajasekaran, Agnita, Morales, Josefa, Vazquez, Josep, Fleming, Gini, Price, Karen, Regan, Meredith, Francis, Prudence, Lang, Istvan, Ciruelos, Eva, Lluch, Ana, Climent, Miguel Angel, Catalan, Gustavo, Avella, Antoni, Bohn, Uriel. American Society of Clinical Oncology; 2016. Twelve-month estrogen levels in premenopausal women with hormone receptor-positive breast cancer receiving adjuvant triptorelin plus exemestane or tamoxifen in the suppression of ovarian function trial (SOFT): the SOFT-EST substudy.