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Breast Cancer Research and Treatment

, Volume 174, Issue 1, pp 121–127 | Cite as

G-protein-coupled estrogen receptor GPER-1 expression in hormone receptor-positive breast cancer is associated with poor benefit of tamoxifen

  • Tanja Ignatov
  • Maria Claus
  • Norbert Nass
  • Johannes Haybaeck
  • Bernd Seifert
  • Thomas Kalinski
  • Olaf Ortmann
  • Atanas IgnatovEmail author
Preclinical study
  • 192 Downloads

Abstract

Background

The role of G-protein-coupled estrogen receptor 1 (GPER-1) in the development of tamoxifen resistance in breast cancer is a highly controversial issue. The aim of this study was to determine the expression of GPER-1 in the clinical routine under conditions of endocrine treatment.

Patients and methods

GPER-1 expression was analyzed in 442 patients with primary invasive breast cancer. GPER-1 score of > 3 was determined as positive. Expression data were correlated with clinical and pathological characteristics and patient survival.

Results

GPER-1 expression was observed in 352 (80.9%) cases, and positively correlated with estrogen and progesterone receptor status (p = 0.0001). GPER-1 positivity was associated with an increased grade of differentiation (p = 0.0001) and with a low level of Ki-67 expression (p = 0.0001). High GPER-1 expression was associated with a decreased level upon systemic treatment (p = 0.011). In the whole cohort, GPER-1 expression was associated with prolonged disease-free survival (DFS). DFS between tamoxifen- and aromatase inhibitor-treated GPER-1-positive patients was similar (p = 0.090). Notably, after matching the analysis for the most important prognostic factors, DFS for tamoxifen-treated GPER-1-positive patients was 69.1%, which is a percentage that is significantly lower compared to DFS for GPER-1-positive patients treated with aromatase inhibitors (92.7%) (p = 0.005).

Conclusion

GPER-1 expression is a favorable prognostic factor in breast cancer patients. Its predictive role for poor benefit form tamoxifen treatment should be investigated in further studies.

Keywords

GPER-1 GPR30 Breast cancer Tamoxifen resistance Estrogen 

Notes

Funding

This research did not receive any specific Grant from any funding agency in the public, commercial, or not-for-profit sector.

Compliance with ethical standards

Conflict of interest

The authors have no conflicts of interest.

Ethical standards

The experiments comply with the current laws of Germany and were performed according to the good clinical practice (GCP) guidelines.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Reproductive CenterKITZRegensburgGermany
  2. 2.Department of Gynecology and ObstetricsUniversity Medical Center, RegensburgRegensburgGermany
  3. 3.Department of Obstetrics and GynecologyOtto-von-Guericke UniversityMagdeburgGermany
  4. 4.Department of PathologyOtto-von-Guericke UniversityMagdeburgGermany
  5. 5.Institute of PathologyMedical University of GrazGrazAustria
  6. 6.Pathology HamburgHamburgGermany

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