Go online to PeerView.com/DFJ860 to view the activity, download slides and practice aids, and complete the post-test to earn credit. Breast cancer is a heterogeneous disease comprising different subtypes, with estrogen receptor positive (ER+) being the most common subtype. Endocrine therapy (ET) is the primary treatment in ER+ breast cancer, which includes different strategies that directly or indirectly modify estrogen production. CDK4 and 6 inhibition as well as PI3K inhibition have improved outcomes in these patients, but most still develop endocrine resistance. ESR1 gene mutations, somatic alterations, microenvironmental factors, and epigenetic changes have all been implicated as underlying mechanisms promoting resistance. Novel ER-targeting agents such as oral selective estrogen receptor degraders (SERDs) are showing therapeutic promise in the face of ET resistance. In addition, other agents are being evaluated in ER+ disease, including selective estrogen receptor modifiers (SERMs), SERM/SERD hybrids, selective estrogen receptor covalent antagonists (SERCAs), proteolysis targeting chimeras (PROTACs), and others.This PeerView educational activity, based on a recent live symposium, highlights and analyzes the latest evidence and advances in the treatment of ER+/HER2- breast cancer, focusing on the expanding evidence base supporting the use of novel ER-targeted agents such as oral SERDs as a new standard of care in pretreated ER+/HER2- breast cancer. Practical guidance is also provided on how to apply the latest evidence to practice, optimize the use of these agents, and individualize treatment plans that take into account key data, patient- and tumor-related factors, and the specific needs and preferences of each patient. Upon completion of this activity, participants should be better able to: Describe the rationale, mechanisms of action, and latest efficacy and safety data of approved and emerging treatment options for patients with ER+/HER2- breast cancer, including novel oral SERDs and other ER-targeting therapies, and their evolving role in clinical practice; Develop individualized treatment plans for patients with previously treated ER+/HER2- breast cancer that take into account the latest treatment options and all the relevant treatment-, tumor-, and patient-related factors; Integrate a team-based, collaborative, coordinated, and patient-centered approach to select appropriate candidates for SERDs and other new therapies for ER+/HER2- breast cancer, provide essential patient education, and ensure optimal delivery of therapy
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