DNA Methylation and Oestrogen Receptor in Breast Cancer
Author Information
Author(s): Iwase H, Omoto Y, Iwata H, Toyama T, Hara Y, Ando Y, Ito Y, Fujii Y, Kobayashi S
Primary Institution: Department of Surgery II, Nagoya City University Medical School
Hypothesis
The study investigates the relationship between DNA methylation at the oestrogen receptor gene promoters and ER-α expression in breast cancer.
Conclusion
Methylation at the promoter regions of the ER-α gene is negatively correlated with ER-α expression, suggesting it may influence hormone dependence in breast cancer.
Supporting Evidence
- Twenty of 29 patients with ER-α-positive tumors were unmethylated at the P1 promoter region.
- Five of 27 patients with ER-α-negative tumors were unmethylated at the P1 promoter region.
- The incidence of methylation was highly negatively correlated with ER-α expression.
- A negative correlation was also observed at the P0 promoter region of the ER-α gene.
- Tumors with hypermethylated ER-α gene at both promoter regions had negative ER-α values.
Takeaway
The study found that changes in DNA can affect how a gene related to breast cancer works, which might help explain why some cancers don't respond to hormones.
Methodology
Methylation analysis was performed using a methylation-sensitive restriction enzyme and confirmed with Southern hybridization.
Participant Demographics
Patients with ER-α-positive and ER-α-negative tumors.
Statistical Information
P-Value
0.0002; 0.0154
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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