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Updated: Aug 29, 2026

Systems Biology of Metabolic Regulation by Estrogen Receptor Signaling in Breast Cancer
Published on: March 17, 2016
Advances in estrogen receptor biology: prospects for improvements in targeted breast cancer therapy
1Division of Molecular and Cellular Oncology, Department of Medical Oncology, Dana-Farber Cancer Institute, and Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA.
Abstract:
Estrogen receptor (ER) has a crucial role in normal breast development and is expressed in the most common breast cancer subtypes. Importantly, its expression is very highly predictive for response to endocrine therapy. Current endocrine therapies for ER-positive breast cancers target ER function at multiple levels. These include targeting the level of estrogen, blocking estrogen action at the ER, and decreasing ER levels. However, the ultimate effectiveness of therapy is limited by either intrinsic or acquired resistance. Identifying the factors and pathways responsible for sensitivity and resistance remains a challenge in improving the treatment of breast cancer. With a better understanding of coordinated action of ER, its coregulatory factors, and the influence of other intracellular signaling cascades, improvements in breast cancer therapy are emerging.
Insights
Estrogen receptor (ER) is key in breast cancer treatment response. Understanding ER pathways and resistance factors is vital for improving endocrine therapies for ER-positive breast cancers.
Area of Science:
- Oncology
- Endocrinology
- Molecular Biology
Background:
- Estrogen receptor (ER) plays a critical role in breast development and is a hallmark of common breast cancer subtypes.
- ER expression is a strong predictor of response to endocrine therapy in ER-positive breast cancers.
Purpose of the Study:
- To explore the role of estrogen receptor (ER) in breast cancer.
- To identify factors influencing sensitivity and resistance to endocrine therapy.
- To highlight emerging strategies for improving breast cancer treatment based on ER function.
Main Methods:
- Review of current endocrine therapies targeting ER function.
- Analysis of factors contributing to intrinsic and acquired resistance.
- Exploration of the coordinated action of ER, coregulatory factors, and intracellular signaling cascades.
Main Results:
- Endocrine therapies target estrogen levels, ER action, and ER degradation.
- Therapeutic effectiveness is often limited by resistance mechanisms.
- Understanding ER pathways and signaling is crucial for overcoming resistance.
Conclusions:
- Improved understanding of ER's coordinated action with coregulatory factors and signaling pathways is essential.
- This knowledge can lead to novel therapeutic strategies for ER-positive breast cancers.
- Further research into sensitivity and resistance factors will enhance breast cancer treatment outcomes.
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