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Unlocking ESR1 Mutations in Breast Cancer – [Podcast] Ep.211

November 4, 2025

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In metastatic breast cancer, resistance to therapy remains one of the most challenging aspects to care. A key driver of resistance in hormone receptor-positive, HER2-negative disease is the ESR1 mutation, a genetic change that alters the estrogen receptor and limits the effectiveness of certain standard therapies. In this episode, CANCER BUZZ speaks with Eleonara Teplinsky, MD, FASCO, head of breast and gynecologic medical oncology at Valley-Mount Sinai Comprehensive Cancer Care, about how the ESR1 mutation shapes treatment decisions and explains communication strategies, such as the “lock-and-key” model. Then CANCER BUZZ speaks with Maimah Karmo, president and CEO of Tigerlily Foundation about the importance of communicating with patients in ways that foster clarity and compassion through relatable analogies.

“If you had molecular testing of your tumor done at the time of diagnosis, that may not be enough. If there is disease progression, we might need to repeat it. So it’s really important to stress that there are points in the disease course where we're going to be checking for these biomarkers.” - Teplinsky

“The more that we can know about the tumor, how it's going to behave, what treatment it may or may not respond to, really can help us.” - Teplinsky

“Having a physician that is a true partner with the patient, that has a relationship, that's trusted, and that feels safe and secure, it's really, really critical.” - Karmo

 

 

Guests:

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Eleonora Teplinsky, MD, FASCO

Medical Oncologist

Valley Mount Sinai Comprehensive Cancer Care

Paramus, NJ

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Maimah Karmo

President/CEO

Tigerlily Foundation

Additional Resources:  

Unlocking the Conversation: Navigating ESR1 Mutations in Metastatic Breast Cancer


          The views and opinions expressed herein are those of the author(s)/faculty member(s) and do not reflect the official policy or position of their employer(s) or the Association of Cancer Care Centers.