18 Vepdegestrant, a PROteolysis TArgeting Chimera (PROTAC) Estrogen Receptor (ER) Degrader, Plus Palbociclib in ER-Positive/Human Epidermal Growth Factor Receptor 2 (HER2)–Negative Advanced Breast Cancer: Phase 1b CohortByErika P. Hamilton, MD,Rinath M. Jeselsohn,Sara A. Hurvitz, MD,Dejan Juric,Hyo S Han,Melinda L. Telli, MD,George Zahrah,Rita Nanda, MD,Yuanyuan Zhang,Weiwei Tan,Elizabeth Duperret,Eric Zhi,Cecile Mather,Anne F. Schott, MDAugust 10th 2024