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Estrogen receptor-α promoter methylation is a biomarker for outcome prediction of cisplatin resistance in triple-negative breast cancer

  • Authors:
    • Junnan Xu
    • Tao Sun
    • Xiangyu Guo
    • Yan Wang
    • Mingxi Jing
  • View Affiliations / Copyright

    Affiliations: Department of Medical Oncology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital and Institute, Shenyang, Liaoning 110042, P.R. China
    Copyright: © Xu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 2855-2862
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    Published online on: December 19, 2017
       https://doi.org/10.3892/ol.2017.7637
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Abstract

A number of previous studies have indicated the presence of a link between estrogen receptor‑α (ERα) methylation and triple‑negative breast cancer (TNBC). However, the association between ERα methylation and drug resistance during the treatment of TNBC remains unclear. Methylation‑specific polymerase chain reaction was used to investigate the methylation of ERα in the genomic DNA of 35 patients with TNBC who were defined as cisplatin‑based chemotherapy‑resistant using chemosensitivity testing. Survival probabilities by covariates were assessed using Kaplan‑Meier estimator survival analysis and Cox's proportional hazards models, adjusting for age, menopausal status, tumor size, lymph node metastasis and ERα promoter DNA methylation. Of the 35 patients with TNBC analyzed, 8 exhibited ERα promoter DNA methylation. Cisplatin resistance was confirmed to be overwhelmingly associated with ERα methylation by univariate and multivariate analysis. Even in a limited analysis in patients with ERα methylation, the results generated from methylated tumor tissue and unmethylated tumor tissue revealed that expression of breast cancer type 1/2 susceptibility proteins was increased in ERα‑methylated breast tumor tissue compared with in unmethylated tissue. The ERα methylation group tended to have significantly shorter progression‑free (P=0.010) and overall (P=0.023) survival times compared with those in the unmethylated group. Similarly, shorter progression‑free (P=0.024) and overall (P=0.018) survival times were observed in the cisplatin‑resistant group compared with the cisplatin‑non‑resistant group. ERα methylation predicts a poor clinical outcome for patients with TNBC. The results of the present study indicated that ERα methylation may be a candidate surrogate biomarker for outcome prediction and cisplatin resistance in TNBC. Further investigation is required to identify potential biomarkers in a larger cohort in a prospective study.
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Copy and paste a formatted citation
Spandidos Publications style
Xu J, Sun T, Guo X, Wang Y and Jing M: Estrogen receptor-α promoter methylation is a biomarker for outcome prediction of cisplatin resistance in triple-negative breast cancer. Oncol Lett 15: 2855-2862, 2018.
APA
Xu, J., Sun, T., Guo, X., Wang, Y., & Jing, M. (2018). Estrogen receptor-α promoter methylation is a biomarker for outcome prediction of cisplatin resistance in triple-negative breast cancer. Oncology Letters, 15, 2855-2862. https://doi.org/10.3892/ol.2017.7637
MLA
Xu, J., Sun, T., Guo, X., Wang, Y., Jing, M."Estrogen receptor-α promoter methylation is a biomarker for outcome prediction of cisplatin resistance in triple-negative breast cancer". Oncology Letters 15.3 (2018): 2855-2862.
Chicago
Xu, J., Sun, T., Guo, X., Wang, Y., Jing, M."Estrogen receptor-α promoter methylation is a biomarker for outcome prediction of cisplatin resistance in triple-negative breast cancer". Oncology Letters 15, no. 3 (2018): 2855-2862. https://doi.org/10.3892/ol.2017.7637
Copy and paste a formatted citation
x
Spandidos Publications style
Xu J, Sun T, Guo X, Wang Y and Jing M: Estrogen receptor-α promoter methylation is a biomarker for outcome prediction of cisplatin resistance in triple-negative breast cancer. Oncol Lett 15: 2855-2862, 2018.
APA
Xu, J., Sun, T., Guo, X., Wang, Y., & Jing, M. (2018). Estrogen receptor-α promoter methylation is a biomarker for outcome prediction of cisplatin resistance in triple-negative breast cancer. Oncology Letters, 15, 2855-2862. https://doi.org/10.3892/ol.2017.7637
MLA
Xu, J., Sun, T., Guo, X., Wang, Y., Jing, M."Estrogen receptor-α promoter methylation is a biomarker for outcome prediction of cisplatin resistance in triple-negative breast cancer". Oncology Letters 15.3 (2018): 2855-2862.
Chicago
Xu, J., Sun, T., Guo, X., Wang, Y., Jing, M."Estrogen receptor-α promoter methylation is a biomarker for outcome prediction of cisplatin resistance in triple-negative breast cancer". Oncology Letters 15, no. 3 (2018): 2855-2862. https://doi.org/10.3892/ol.2017.7637
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