Reproduced with permission from: Regan MM, Fleming GF, Walley B, et al. Adjuvant systemic treatment of premenopausal women with hormone receptor–positive early breast cancer: Lights and shadows. J Clin Oncol 2019; 37(11):862-866. Copyright © 2019 American Society of Clinical Oncology. https://ascopubs.org/journal/jco.