9 Elacestrant (ELA) vs Standard-of-Care (SOC) in ER+/HER2–Advanced (adv) or Metastatic Breast Cancer (mBC) with ESR1 Mutation (ESR1-mut): Key Biomarkers and Clinical Subgroup Analyses From the Phase 3 EMERALD TrialByAditya Bardia, MD, MPH,Joyce O’Shaughnessy, MD,Francois Clement Bidard,Phillipe Aftimos,Javier Cortes,Janice Lu, MD, PhD ,Giulia Tonini,Kathy Puyana Theall,Alessandro Paoli,Virginia Kaklamani, MD, DScAugust 24th 2024