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01.09.2013 | Original Paper

Potential clinical significance of ERβ ON promoter methylation in sporadic breast cancer

verfasst von: Ana Božović, Milan Markićević, Bogomir Dimitrijević, Snežana Jovanović Ćupić, Milena Krajnović, Silvana Lukić, Vesna Mandušić

Erschienen in: Medical Oncology | Ausgabe 3/2013

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Abstract

The aim of the study was to assess how hypermethylation of the ON promoter of the estrogen receptor beta (ERβ) gene affects its expression (at the mRNA and protein level) and to correlate these with some clinical and histopathological parameters. A total of 131 samples of frozen breast cancer tissue was analyzed. A custom-designed, two-step PCR method was used to measure the methylation index of the ERβ gene ON promoter region. Quantitative reverse transcriptase-polymerase chain reaction (qRT-PCR) was performed to quantify mRNA of the ERβ1 isoform, while ERβ1 protein was determined using the Western blot method. There was a significant difference in the methylation index of the ERβ gene ON promoter between the groups of patients with negative and positive axillary lymph node status (P = 0.03). In addition, the methylation index of the ON promoter was positively correlated with estrogen receptor alfa (ERα) protein levels (ρ = 0.31, P = 0.02). There was a significant difference in the methylation index of the ON promoter between the progesterone receptor (PR)-negative and PR-positive groups of patients (P = 0.01). ERβ1 protein levels were negatively correlated with ERα protein (ρ = −0.27, P < 0.01). The methylation index of the ON promoter could be a more reliable additional parameter for prediction and/or prognosis in breast cancer than ERβ1-mRNA and/or protein levels.

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Titel: Potential clinical significance of ERβ ON promoter methylation in sporadic breast cancer
verfasst von: Ana Božović
Milan Markićević
Bogomir Dimitrijević
Snežana Jovanović Ćupić
Milena Krajnović
Silvana Lukić
Vesna Mandušić
Publikationsdatum: 01.09.2013
Verlag: Springer US
Erschienen in: Medical Oncology / Ausgabe 3/2013
Print ISSN: 1357-0560
Elektronische ISSN: 1559-131X
DOI: https://doi.org/10.1007/s12032-013-0642-4

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Springer Medizin

Potential clinical significance of ERβ ON promoter methylation in sporadic breast cancer

Abstract

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