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Polymorphic catechol-O-methyltransferase gene and breast cancer risk
K Mitrunen1, N Jourenkova, V Kataja
1Department of Industrial Hygiene and Toxicology, Finnish Institute of Occupational Health, 00250 Helsinki, Finland.
Summary
The catechol-O-methyltransferase (COMT) genotype influences breast cancer risk, particularly in premenopausal women and when combined with factors like hormone exposure and body mass index. Specific COMT genotypes are linked to both decreased and increased susceptibility.
Area of Science:
- Genetics and Epidemiology
- Oncology
- Molecular Biology
Background:
- Individual susceptibility to breast cancer varies significantly.
- Genetic factors, such as variations in the catechol-O-methyltransferase (COMT) gene, are being investigated for their role in breast cancer risk.
- Hormonal and reproductive factors are known modulators of breast cancer development.
Purpose of the Study:
- To investigate the association between catechol-O-methyltransferase (COMT) genotype and individual susceptibility to breast cancer.
- To explore how menopausal status modifies the relationship between COMT genotype and breast cancer risk.
- To identify interactions between COMT genotype, reproductive events, and hormone exposure in breast cancer development.
Main Methods:
- A case-control study involving 483 Finnish breast cancer cases and 482 population controls.
- Unconditional logistic regression analysis was used to estimate odds ratios (ORs) and 95% confidence intervals (CIs).
- Adjustments were made for known or suspected breast cancer risk factors, including menopausal status, body mass index, estrogen use, and age at menarche.
Main Results:
- COMT-L allele-containing genotypes were inversely associated with premenopausal breast cancer, especially advanced stages (OR, 0.44).
- Among postmenopausal women, the COMT-LL genotype showed decreased risk for local carcinoma (OR, 0.55) and the lowest risk when combined with low BMI (OR, 0.33).
- Increased risk was observed for postmenopausal women with the COMT-LL genotype and long-term estrogen use (OR, 4.02) or COMT-L allele-containing genotypes and early menarche (OR, 8.59).
Conclusions:
- COMT genotype may contribute to individual breast cancer susceptibility.
- The effect of COMT genotype on breast cancer risk appears to be modulated by menopausal status, reproductive events, and hormone exposure.
- While not a major overall risk factor, COMT genotype may play a role in specific subgroups of breast cancer patients.