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Print ISSN: 1792-1074 Online ISSN: 1792-1082
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February-2016 Volume 11 Issue 2

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International Journal of Molecular Medicine

International Journal of Molecular Medicine is an international journal devoted to molecular mechanisms of human disease.

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Oncology Reports is an international journal devoted to fundamental and applied research in Oncology.

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Experimental and Therapeutic Medicine is an international journal devoted to laboratory and clinical medicine.

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Article

ERβ overexpression results in endocrine therapy resistance and poor prognosis in postmenopausal ERα-positive breast cancer patients

  • Authors:
    • Liying Guo
    • Yu Zhang
    • Dilimina Yilamu
    • Sha Liu
    • Chenming Guo
  • View Affiliations / Copyright

    Affiliations: Department of Breast Cancer, Digestive and Vascular Center, First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang 830054, P.R. China, Department of General Surgery, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong 264100, P.R. China
  • Pages: 1531-1536
    |
    Published online on: January 8, 2016
       https://doi.org/10.3892/ol.2016.4095
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Abstract

The aim of the present study was to investigate the role of estrogen receptor (ER) β in the prognosis of ERα‑positive breast cancer in postmenopausal women, and its effect on the efficacy of endocrine therapy. Tissue specimens from 195 patients with postmenopausal breast cancer were analyzed. ERβ expression levels were detected using immunohistochemical staining. Kaplan-Meier analysis was performed to assess patient survival, and the difference in survival was analyzed using the log‑rank test. Cox regression was utilized to evaluate prognostic factors. The results revealed that the disease‑free survival rate decreased dramatically as ERβ expression levels increased in all postmenopausal ERα‑positive breast cancer patients, and ERβ expression was identified to be an indicator of poor prognosis in cases of this disease. Similarly, in postmenopausal ERα‑positive breast cancer patients undergoing endocrine therapy, high ERβ expression levels reduced the disease‑free survival rate and were correlated with poor patient prognosis. However, in such patients who were not treated with endocrine therapy, disease‑free survival rate and prognosis were not significantly affected by ERβ expression. In conclusion, ERβ overexpression led to endocrine therapy resistance and poor prognosis in postmenopausal ERα‑positive breast cancer patients, suggesting that ERβ may affect breast cancer prognosis via an increase in endocrine therapy resistance.
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Copy and paste a formatted citation
Spandidos Publications style
Guo L, Zhang Y, Yilamu D, Liu S and Guo C: ERβ overexpression results in endocrine therapy resistance and poor prognosis in postmenopausal ERα-positive breast cancer patients. Oncol Lett 11: 1531-1536, 2016.
APA
Guo, L., Zhang, Y., Yilamu, D., Liu, S., & Guo, C. (2016). ERβ overexpression results in endocrine therapy resistance and poor prognosis in postmenopausal ERα-positive breast cancer patients. Oncology Letters, 11, 1531-1536. https://doi.org/10.3892/ol.2016.4095
MLA
Guo, L., Zhang, Y., Yilamu, D., Liu, S., Guo, C."ERβ overexpression results in endocrine therapy resistance and poor prognosis in postmenopausal ERα-positive breast cancer patients". Oncology Letters 11.2 (2016): 1531-1536.
Chicago
Guo, L., Zhang, Y., Yilamu, D., Liu, S., Guo, C."ERβ overexpression results in endocrine therapy resistance and poor prognosis in postmenopausal ERα-positive breast cancer patients". Oncology Letters 11, no. 2 (2016): 1531-1536. https://doi.org/10.3892/ol.2016.4095
Copy and paste a formatted citation
x
Spandidos Publications style
Guo L, Zhang Y, Yilamu D, Liu S and Guo C: ERβ overexpression results in endocrine therapy resistance and poor prognosis in postmenopausal ERα-positive breast cancer patients. Oncol Lett 11: 1531-1536, 2016.
APA
Guo, L., Zhang, Y., Yilamu, D., Liu, S., & Guo, C. (2016). ERβ overexpression results in endocrine therapy resistance and poor prognosis in postmenopausal ERα-positive breast cancer patients. Oncology Letters, 11, 1531-1536. https://doi.org/10.3892/ol.2016.4095
MLA
Guo, L., Zhang, Y., Yilamu, D., Liu, S., Guo, C."ERβ overexpression results in endocrine therapy resistance and poor prognosis in postmenopausal ERα-positive breast cancer patients". Oncology Letters 11.2 (2016): 1531-1536.
Chicago
Guo, L., Zhang, Y., Yilamu, D., Liu, S., Guo, C."ERβ overexpression results in endocrine therapy resistance and poor prognosis in postmenopausal ERα-positive breast cancer patients". Oncology Letters 11, no. 2 (2016): 1531-1536. https://doi.org/10.3892/ol.2016.4095
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