外周血白细胞PDE4 C基因甲基化及环境因素交互作用与乳腺癌发病的关系

摘要

目的 探讨外周血白细胞中磷酸二酯酶4C( PDE4C)基因甲基化和环境因素的交互作用与乳腺癌发病的关系.方法 采用病例对照研究,选择2010年10月—2014年12月纳入的402例乳腺癌病例和470例对照作为研究对象,使用特异性DNA甲基化修饰的定量PCR方法检测PDE4C基因的甲基化水平.应用叉生分析、多因素Logistic回归,分析基因甲基化水平及其和环境因素的交互作用与乳腺癌发病的关系.结果 未发现PDE4C甲基化与乳腺癌的发病有显著关联.高频次/摄入量的粗粮、蔬菜、葱属性植物、禽肉、牛奶及经常运动可降低乳腺癌的发病风险;高频次/摄入量的猪肉,以及月经周期不规律、心理应激指数偏高可增加乳腺癌的发病风险. PDE4C高甲基化与食用葱属性植物大于3次/周有显著的联合作用(OR=0. 373,95% CI:0. 208~0. 668,P=0. 001).结论 PDE4C基因高甲基化不是乳腺癌发病的独立危险因素,其与环境因素的联合作用影响乳腺癌的发病风险.%Objective The objective of this study was to investigate the relationship between the methylation of phosphodies-terase 4C(PDE4C)gene in peripheral blood leukocytes,and its interaction with environmental factors and the pathogenesis of breast cancer. Methods A case-control study was conducted to select 402 cases of breast cancer and 470 cancer-free controls from Octo-ber 2010 to December 2014. The specific DNA methylation-modified quantitative PCR method was used to detect the methylation of PDE4C gene. The use of crossover analysis and multivariate logistic regression was used to analyze the relationship between the level of gene methylation and its interaction with environmental factors and the pathogenesis of breast cancer. Results PDE4C methylation was not found to be significantly associated with the onset of breast cancer. High-frequency/high-intake of whole grains,vegetables, onion-based plants,poultry,milk,and regular exercise could reduce the risk of breast cancer;high-frequency/high-intake of pork, irregular menstrual cycle,and a high psychological stress index could increase the risk of breast cancer. PDE4C hypermethylation had a significant combining effect with edible onion-producing plants greater than 3 times/week,with an OR of 0. 373(95% CI:0. 208~0. 668,P=0. 001). Conclusion Hypermethylation of PDE4C is not an independent risk factor for breast cancer,and its combination with environmental factors affects the risk of breast cancer.