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Kotsopoulos J , Ghadirian P , El-Sohemy A , Lynch HT , Snyder C , Daly M , Domchek S , Randall S , Karlan B , Zhang P , Zhang SY , Sun P , Narod SA
The CYP1A2 genotype modifies the association between coffee consumption and breast cancer risk among BRCA1 mutation carriers
Cancer Epidemiology Biomarkers & Prevention. 2007 May;16(5) :912-916
AbstractWe have recently reported that, among BRCA1 mutation carriers, the consumption of caffeinated coffee was associated with a significant reduction in breast cancer risk. Because the metabolism of caffeine is primarily by CYP1A2, we examined whether or not the CYP1A2 genotype modifies the association between a history of coffee consumption and the risk of breast cancer. A common A to C polymorphism in the CYP1A2 gene is associated with decreased enzyme inducibility and impaired caffeine metabolism. Information regarding coffee consumption habits and the CYP1A2 genotype was available for 411 BRCA1 mutation carriers (170 cases and 241 controls). We estimated the odds ratios (ORs) and 95% confidence intervals (95% CIs) for breast cancer associated with the CYP1A2 genotype and a history of coffee consumption before age 35, adjusting for potential confounders. The CYP1A2 genotype did not affect breast cancer risk. Among women with at least one variant C allele (AC or CC), those w!