ArticleCancer science2014
BRCA1 promoter methylation of normal breast epithelial cells as a possible precursor for BRCA1-methylated breast cancer.
Article in Cancer science, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers, 4 of them syntheses that pooled it.
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Who cites it
12 citing papers in PubMed, 4 syntheses or guidelines pooled it, 20 citations in OpenAlex.
- Pooled it
- Association of BRCA1 Promoter Methylation with Breast Cancer in Asia: A Meta- AnalysisAsian Pacific journal of cancer prevention : APJCP · 2018Pooled it
- Association of BRCA1 promoter methylation with sporadic breast cancers: Evidence from 40 studies.Scientific reports · 2015Pooled it
- Aberrant GSTP1 promoter methylation is associated with increased risk and advanced stage of breast cancer: a meta-analysis of 19 case-control studies.BMC cancer · 2015Pooled it
- Article
- Methylation of promoter region of BRCA1 gene versus pathogenic variants of gene: risk factor or clinical marker of breast cancer.Breast cancer research and treatment · 2022Article
- Methylation of Glutathione-S-Transferase P1 Promotor in Egyptian Females with Breast Cancer.Asian Pacific journal of cancer prevention : APJCP · 2019Article
- Methylation Profiles of BRCA1, RASSF1A and GSTP1 in Vietnamese Women with Breast CancerAsian Pacific journal of cancer prevention : APJCP · 2018Article
- Article
- Promoter Methylation Status of Breast Cancer Susceptibility Gene 1 and 17 Beta Hydroxysteroid Dehydrogenase Type 1 Gene in Sporadic Breast Cancer Patients.International journal of breast cancer · 2016Article
- The AIB1 gene polyglutamine repeat length polymorphism contributes to risk of epithelial ovarian cancer risk: a case-control study.Tumour biology : the journal of the International Society for Oncodevelopmental Biology and Medicine · 2015Article
- Promoter methylation of TRIM9 as a marker for detection of circulating tumor DNA in breast cancer patients.SpringerPlus · 2015Article
Corrections and comments
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Authors and funding
10 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The breast cancer susceptibility gene 1 (BRCA1) and glutathione S-transferase P1 (GSTP1) promoters are reportedly often methylated in breast cancer tissues. Their methylation status in surrounding normal breast tissues has not been examined thoroughly although this may well be important for a better understanding of breast carcinogenesis. In this study, BRCA1 and GSTP1 promoter methylation was examined by methylation-specific PCR assay. Patients with BRCA1-methylated (n = 15) or BRCA1-unmethylated (n = 15) tumors and those with GSTP1-methylated (n = 9) or GSTP1-unmethylated (n = 11) tumors were included in the present study. Methylation status of manually micro-dissected normal epithelial cells from the formalin-fixed paraffin-embedded sections of normal breast tissues adjacent to and distant from the tumors was examined at multiple sites (n = 1-5). Of the 15 patients with BRCA1-methylated tumors, 9 harbored BRCA1 promoter methylation in at least one site of the normal breast tissues. However, no BRCA1 promoter methylation was observed at any site of the normal tissues of the 15 patients with BRCA1-unmethylated tumors. No GSTP1 promoter methylation was observed in the normal tissues regardless of the methylation status of the tumors. The presence of BRCA1 promoter methylation in the normal tissues was confirmed in the epithelial cells enriched with the magnetic-activated cell sorting method. Our findings suggest that a small proportion of normal breast epithelial cells with BRCA1 promoter methylation can be precursor cells from which BRCA1-methylated breast tumors may originate. This does not apply to GSTP1 promoter methylation.
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