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Resistance to endocrine therapy in breast cancer: molecular mechanisms and future goals

Introduction The majority of breast cancers (BCs) are characterized by the expression of estrogen receptor alpha (ERα+). ERα acts as ligand-dependent transcription factor for genes associated with cell survival, proliferation, and tumor growth. Thus, blocking the estrogen agonist effect on ERα is th...

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Published in:Breast cancer research and treatment 2019-02, Vol.173 (3), p.489-497
Main Authors: Szostakowska, Małgorzata, Trębińska-Stryjewska, Alicja, Grzybowska, Ewa Anna, Fabisiewicz, Anna
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description Introduction The majority of breast cancers (BCs) are characterized by the expression of estrogen receptor alpha (ERα+). ERα acts as ligand-dependent transcription factor for genes associated with cell survival, proliferation, and tumor growth. Thus, blocking the estrogen agonist effect on ERα is the main strategy in the treatment of ERα+ BCs. However, despite the development of targeted anti-estrogen therapies for ER+ BC, around 30–50% of early breast cancer patients will relapse. Acquired resistance to endocrine therapy is a great challenge in ER+ BC patient treatment. Discussion Anti-estrogen resistance is a consequence of molecular changes, which allow for tumor growth irrespective of estrogen presence. Those changes may be associated with ERα modifications either at the genetic, regulatory or protein level. Additionally, the activation of alternate growth pathways and/or cell survival mechanisms can lead to estrogen-independence and endocrine resistance. Conclusion This comprehensive review summarizes molecular mechanisms associated with resistance to anti-estrogen therapy, focusing on genetic alterations, stress responses, cell survival mechanisms, and cell reprogramming.
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ERα acts as ligand-dependent transcription factor for genes associated with cell survival, proliferation, and tumor growth. Thus, blocking the estrogen agonist effect on ERα is the main strategy in the treatment of ERα+ BCs. However, despite the development of targeted anti-estrogen therapies for ER+ BC, around 30–50% of early breast cancer patients will relapse. Acquired resistance to endocrine therapy is a great challenge in ER+ BC patient treatment. Discussion Anti-estrogen resistance is a consequence of molecular changes, which allow for tumor growth irrespective of estrogen presence. Those changes may be associated with ERα modifications either at the genetic, regulatory or protein level. Additionally, the activation of alternate growth pathways and/or cell survival mechanisms can lead to estrogen-independence and endocrine resistance. Conclusion This comprehensive review summarizes molecular mechanisms associated with resistance to anti-estrogen therapy, focusing on genetic alterations, stress responses, cell survival mechanisms, and cell reprogramming.</description><identifier>ISSN: 0167-6806</identifier><identifier>EISSN: 1573-7217</identifier><identifier>DOI: 10.1007/s10549-018-5023-4</identifier><identifier>PMID: 30382472</identifier><language>eng</language><publisher>New York: Springer US</publisher><subject>Antiestrogens ; Antineoplastic Agents, Hormonal - administration &amp; dosage ; Antineoplastic Agents, Hormonal - adverse effects ; Antineoplastic Agents, Hormonal - therapeutic use ; Autophagy - drug effects ; Biomarkers, Tumor ; Breast cancer ; Breast Neoplasms - drug therapy ; Breast Neoplasms - etiology ; Breast Neoplasms - metabolism ; Breast Neoplasms - pathology ; Cancer patients ; Cancer research ; Cancer treatment ; Care and treatment ; Cell survival ; Drug Resistance, Neoplasm ; Endocrine therapy ; Estrogen receptors ; Estrogens ; Female ; Genes ; Genetic aspects ; Health aspects ; Humans ; Medicine ; Medicine &amp; Public Health ; Molecular modelling ; Neoplastic Stem Cells - drug effects ; Neoplastic Stem Cells - metabolism ; Oncology ; Patients ; Phenols (Class of compounds) ; Receptors, Estrogen - antagonists &amp; inhibitors ; Receptors, Estrogen - genetics ; Receptors, Estrogen - metabolism ; Recurrence (Disease) ; Review ; Transcription (Genetics) ; Tumors ; Unfolded Protein Response - drug effects</subject><ispartof>Breast cancer research and treatment, 2019-02, Vol.173 (3), p.489-497</ispartof><rights>The Author(s) 2018</rights><rights>COPYRIGHT 2019 Springer</rights><rights>Breast Cancer Research and Treatment is a copyright of Springer, (2018). All Rights Reserved. © 2018. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). 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ERα acts as ligand-dependent transcription factor for genes associated with cell survival, proliferation, and tumor growth. Thus, blocking the estrogen agonist effect on ERα is the main strategy in the treatment of ERα+ BCs. However, despite the development of targeted anti-estrogen therapies for ER+ BC, around 30–50% of early breast cancer patients will relapse. Acquired resistance to endocrine therapy is a great challenge in ER+ BC patient treatment. Discussion Anti-estrogen resistance is a consequence of molecular changes, which allow for tumor growth irrespective of estrogen presence. Those changes may be associated with ERα modifications either at the genetic, regulatory or protein level. Additionally, the activation of alternate growth pathways and/or cell survival mechanisms can lead to estrogen-independence and endocrine resistance. 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subjects Antiestrogens
Antineoplastic Agents, Hormonal - administration & dosage
Antineoplastic Agents, Hormonal - adverse effects
Antineoplastic Agents, Hormonal - therapeutic use
Autophagy - drug effects
Biomarkers, Tumor
Breast cancer
Breast Neoplasms - drug therapy
Breast Neoplasms - etiology
Breast Neoplasms - metabolism
Breast Neoplasms - pathology
Cancer patients
Cancer research
Cancer treatment
Care and treatment
Cell survival
Drug Resistance, Neoplasm
Endocrine therapy
Estrogen receptors
Estrogens
Female
Genes
Genetic aspects
Health aspects
Humans
Medicine
Medicine & Public Health
Molecular modelling
Neoplastic Stem Cells - drug effects
Neoplastic Stem Cells - metabolism
Oncology
Patients
Phenols (Class of compounds)
Receptors, Estrogen - antagonists & inhibitors
Receptors, Estrogen - genetics
Receptors, Estrogen - metabolism
Recurrence (Disease)
Review
Transcription (Genetics)
Tumors
Unfolded Protein Response - drug effects
title Resistance to endocrine therapy in breast cancer: molecular mechanisms and future goals
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