The results from the phase III EMERALD trial led to the approval of ORSERDU® (elacestrant) as the first oral selective estrogen receptor degrader for ER-positive/HER2-negative metastatic breast cancer patients with ESR1 mutations after disease progression following at least one line of endocrine therapy.1 But given the results from prior analyses, clinicians wanted to better understand the data for elacestrant in subgroups of patients with key clinical or biomarker characteristics, and so a post hoc analysis of elacestrant in these subgroups who typically have a poorer prognosis was conducted. Explore the EMERALD trial and the key outcomes from this subgroup analysis with Dr. Jennifer Caudle and medical oncologist Dr. Joyce O'Shaughnessy.