Imlunestrant, an investigational next-generation selective estrogen receptor degrader (SERD), improved progression-free survival in patients with endocrine therapy-pretreated, ER-positive, HER2-negative advanced breast cancer-;as monotherapy in patients with ESR1 mutations and as combination therapy with abemaciclib (Verzenio) in all patients, regardless of ESR1 mutation status-;according to results from the phase III EMBER-3 clinical trial presented at the San Antonio Breast Cancer Symposium (SABCS), held December 10-13, 2024.