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• W2102372977 abstract "Objective To examine the potential gene–environment interaction between cigarette smoking and the complement factor H (CFH) T1277C polymorphism, 2 strong risk factors for age-related macular degeneration (AMD). Design Retrospective case–control study. Participants A university clinic-based sample of 599 people with AMD and 242 controls. Methods Standard criteria were used to rate disease severity (grades 1–5) from fundus photographs. Individuals were classified as “ever smokers” or “never smokers” based on self-reported lifetime smoking of at least 100 cigarettes. Intensity of smoking was evaluated by calculating pack-years of smoking, which was analyzed as a continuous variable, and by categorizing individuals as smoking more or less than the median 30 pack-years. T1277C genotypes were determined by sequencing the polymorphic site. Generalized estimating equations were used to analyze the effects of smoking and genotype, controlling for age and gender and adjusting for correlations among related subjects. Main Outcome Measure Age-related macular degeneration affection status. Results Interaction terms between T1277C genotype and smoking variables were not statistically significant, indicating a multiplicative relationship between risk factors. Effects of both T1277C genotype and cigarette smoking were stronger when comparing neovascular (grade 5) AMD with grade 1 controls than when comparing all cases (grades 3–5) with grades 1 to 2 controls. Conclusion These results suggest that cigarette smoking and T1277C are independent risk factors for AMD and that both risk factors are associated more strongly with neovascular AMD than all forms of AMD combined. To examine the potential gene–environment interaction between cigarette smoking and the complement factor H (CFH) T1277C polymorphism, 2 strong risk factors for age-related macular degeneration (AMD). Retrospective case–control study. A university clinic-based sample of 599 people with AMD and 242 controls. Standard criteria were used to rate disease severity (grades 1–5) from fundus photographs. Individuals were classified as “ever smokers” or “never smokers” based on self-reported lifetime smoking of at least 100 cigarettes. Intensity of smoking was evaluated by calculating pack-years of smoking, which was analyzed as a continuous variable, and by categorizing individuals as smoking more or less than the median 30 pack-years. T1277C genotypes were determined by sequencing the polymorphic site. Generalized estimating equations were used to analyze the effects of smoking and genotype, controlling for age and gender and adjusting for correlations among related subjects. Age-related macular degeneration affection status. Interaction terms between T1277C genotype and smoking variables were not statistically significant, indicating a multiplicative relationship between risk factors. Effects of both T1277C genotype and cigarette smoking were stronger when comparing neovascular (grade 5) AMD with grade 1 controls than when comparing all cases (grades 3–5) with grades 1 to 2 controls. These results suggest that cigarette smoking and T1277C are independent risk factors for AMD and that both risk factors are associated more strongly with neovascular AMD than all forms of AMD combined." @default.
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• W2102372977 date "2007-06-01" @default.
• W2102372977 modified "2023-09-27" @default.
• W2102372977 title "Independent Effects of Complement Factor H Y402H Polymorphism and Cigarette Smoking on Risk of Age-Related Macular Degeneration" @default.
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• W2102372977 doi "https://doi.org/10.1016/j.ophtha.2006.08.054" @default.
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