S12 Ep48: Innovations in HR+/HER2– Metastatic Breast Cancer: Advancing Care Through PROTAC ER Degradation

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This featured podcast includes a data review and candid conversation with 4 experts on challenges in the current treatment paradigm for hormone receptor–positive/HER2-negative (HR+/HER2–) metastatic breast cancer (mBC) due to endocrine resistance. This session occurred during a satellite symposium held in conjunction with the 42nd Annual Miami Breast Cancer Conference® in March 2025. ESR1 mutations are a critical mechanism of resistance, spurring the development of next-generation endocrine agents targeting these mutations. These agents including oral selective estrogen receptor degraders (SERDs) and agents with novel mechanisms, including proteolysis-targeting chimeras (PROTACs), which may offer potential improvements over current treatments. This program will review mechanisms of resistance to current endocrine regimens, strategies to overcome this resistance including comparative mechanisms of novel endocrine agents, emerging data from ongoing clinical trials, and expert perspectives on where these new agents may fit into current algorithms.