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Updated: Jun 13, 2026
10:36
Systems Biology of Metabolic Regulation by Estrogen Receptor Signaling in Breast Cancer
Published on: March 17, 2016
Estrogen receptor mutations and changes in downstream gene expression and signaling
Ines Barone1, Lauren Brusco, Suzanne A W Fuqua
1Centro Sanitario and Department of Cellular Biology, University of Calabria, Arcavacata di Rende, Cosenza, Italy.
Summary
Variant estrogen receptors (ERalpha) contribute to endocrine therapy resistance in ERalpha-positive breast cancer. Understanding these variants and their signaling pathways is key to developing new treatment strategies.
Area of Science:
- Oncology
- Endocrinology
- Molecular Biology
Background:
- Estrogen receptor alpha (ERalpha) is crucial in ERalpha-positive breast cancer growth.
- Standard treatments include anti-estrogens (tamoxifen) and aromatase inhibitors (letrozole, anastrozole, exemestane).
- Resistance to endocrine therapy (de novo and acquired) limits treatment efficacy.
Purpose of the Study:
- To review variant estrogen receptors (ERalpha) and their role in endocrine therapy resistance.
- To explore the molecular cross-talk of variant receptors with growth factor receptors and signaling components.
- To highlight the clinical relevance of understanding these mechanisms for novel therapeutic strategies.
Main Methods:
- Review of scientific literature on estrogen receptor variants and endocrine resistance.
- Analysis of molecular mechanisms, including alternative splicing and gene mutations.
- Examination of cross-talk between ERalpha variants and signaling pathways.
Main Results:
- Variant ERalpha forms arise from alternative splicing or gene mutations.
- These variants contribute to both de novo and acquired resistance to endocrine therapies.
- Molecular cross-talk with growth factor receptors and signaling pathways is implicated in resistance.
Conclusions:
- Variant ERalpha receptors are clinically relevant in endocrine therapy resistance.
- Understanding receptor-mediated signaling complexity offers potential for new combined therapeutic options.
- Targeting receptor cross-talk may lead to more effective blockade strategies for ERalpha-positive breast cancer.
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