• K Mitrunen, N Jourenkova, V Kataja, M Eskelinen, V M Kosma, S Benhamou, D Kang, H Vainio, M Uusitupa, and A Hirvonen.
• Department of Industrial Hygiene and Toxicology, Finnish Institute of Occupational Health, 00250 Helsinki, Finland.
• Cancer Epidemiol. Biomarkers Prev. 2001 Jun 1; 10 (6): 635-40.

AbstractWe examined 483 Finnish breast cancer cases and 482 population controls to determine the potential effect of catechol-O-methyltransferase (COMT) genotype in individual susceptibility to breast cancer. Odds ratios (ORs) and 95% confidence intervals (CIs) were estimated by unconditional logistic regression after adjustment for known or suspected risk factors for breast cancer. When studied separately by menopausal status, the COMT-L allele-containing genotypes were inversely associated with premenopausal breast cancer, especially with advanced stage of the disease (OR, 0.44; 95% CI, 0.22-0.87). Among postmenopausal women a similar decreased risk was seen for local carcinoma associated with the COMT-LL genotype (OR, 0.55; 95% CI, 0.31-0.98). The lowest breast cancer risk was seen in the postmenopausal women with the COMT-LL genotype and low body-mass index (30 months) use of estrogen (OR, 4.02; 95% CI, 1.13-14.3), or with the COMT-L allele-containing genotypes and early age (

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