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2018 | 65 | 1 | 51-57
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The ESR1 and GPX1 gene expression level in human malignant and non-malignant breast tissues

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Background: The aim of this study was to establish whether the gene expression of estrogen receptor alpha (encoded by ESR1) correlates with the expression of glutathione peroxidase 1 (encoded by GPX1) in the tumor and adjacent tumor-free breast tissue, and whether this correlation is affected by breast cancer. Such relationships may give further insights into breast cancer pathology with respect to the status of estrogen receptor. Methods: We used the quantitative real-time PCR technique to analyze differences in the expression levels of the ESR1 and GPX1 genes in paired malignant and non-malignant tissues from breast cancer patients. Results: ESR1 and GPX1 expression levels were found to be significantly down-regulated by 14.7% and 7.4% (respectively) in the tumorous breast tissue when compared to the non-malignant one. Down-regulation of these genes was independent of the tumor histopathology classification and clinicopathological factors, while the ESR1 mRNA level was reduced with increasing tumor grade (G1: 103% vs. G2: 85.8% vs. G3: 84.5%; p<0.05). In the non-malignant and malignant breast tissues, the expression levels of ESR1 and GPX1 were significantly correlated with each other (Rs=0.450 and Rs=0.360; respectively). Conclusion: Our data suggest that down-regulation of ESR1 and GPX1 was independent of clinicopathological factors. Down-regulation of ESR1 gene expression was enhanced by the development of the disease. Moreover, GPX1 and ESR1 gene expression was interdependent in the malignant breast tissue and further work is needed to determine the mechanism underlying this relationship.
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  • Department of Biological and Environmental Monitoring, Nofer Institute of Occupational Medicine, Łódź, Poland
  • Department of Surgical Oncology, Copernicus Memorial Hospital, Cancer Center, Łódź, Poland
  • Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, Łódź, Poland
  • Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, Łódź, Poland
  • Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, Łódź, Poland
  • Department of Toxicology and Carcinogenesis, Nofer Institute of Occupational Medicine, Łódź, Poland
  • Department of Surgical Oncology, Copernicus Memorial Hospital, Cancer Center, Łódź, Poland
  • Department of Biological and Environmental Monitoring, Nofer Institute of Occupational Medicine, Łódź, Poland
  • Department of Biological and Environmental Monitoring, Nofer Institute of Occupational Medicine, Łódź, Poland
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