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Chapter category: Oncology

Estrogen Receptors in Resistance to Hormone Therapy

This chapter appears in the following book:

Breast Cancer Chemosensitivity

Edited by: Dihua Yu and Mien-Chie Hung
ISBN: 978-0-387-74037-9
» Get more information about this book at landesbioscience.com «

Chapter authors:
Matthew H. Herynk and Suzanne A.W. Fuqua


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Estrogen and its receptors a and b (ERa and ERb) play a major role in tumor progression and approximately two-thirds of breast cancers express these functional receptors. Thus, the ER is a major target for current and developing therapies. Although most ER-positive tumors initially respond to hormonal therapies such as tamoxifen, many tumors will eventually become resistant to tamoxifen induced growth inhibition. This chapter will discuss molecular mechanisms that contribute to hormonal resistance of current therapies including ERa mutations, the roles of proliferation and apoptosis in tumor homeostasis and receptor coregulator proteins. Additionally, the role of nonclassical ERa signaling through growth factor receptors and the subsequent downstream-initiated signaling, and the role of the progesterone receptors will be discussed.

Matthew H. Herynk
Breast Center, Baylor College of Medicine and the Methodist Hospital

Suzanne A.W. Fuqua
Departments of Medicine, Molecular and Cellular Biology, Breast Center, Baylor College of Medicine

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Estrogen Receptors in Resistance to Hormone Therapy

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