Gallegos-Arreola M P, Figuera-Villanueva L E, Troyo-Sanroman R, Morgn-Villela G, Puebla-Prez A M, Flores-Marquez M R, Zniga-Gonzlez G M
Molecular Genetics Laboratory, Division of Molecular Medicine, Centro de Investigacin Biomdica de Oc.
Int J Biol Markers. 2008 Jan-Mar;23(1):24-30. doi: 10.5301/JBM.2008.379.
CYP1A1 is a gene involved in the high aryl hydrocarbon hydroxylase -inducible phenotype, which is a genetically-determined variation among individuals that has been associated with lung cancer risk. More specifically, CYP1A1*2B and *4 polymorphisms have been associated with high susceptibility to lung cancer among cigarette smokers.
DNA was obtained from blood samples and we studied by PCR-RFLP the distribution of CYP1A1*2B (n=248) and *4 (n=222) polymorphisms in healthy controls and 222 lung cancer patients from a Mexican population.
Comparisons between groups showed an increased risk for lung cancer patients of *2B/*2B (18%; OR 7.6; 95% CI 3.0-19.2) and *4/*4 genotypes (15%; OR 11.45; 95% CI 2.19-59.85) compared to the control group (1% for *2B/*2B and 4.4% for *4/*4). A significant association between lung cancer and homozygous *2B/*2B passive smokers and *4/*4 ever (cigarettes) and passive smokers was also observed (p<0.05). Multivariate analysis revealed an increased risk for the *2B/2B genotype (OR 6.83), as well as for *4/*4 (OR 28.8).
The results of the study indicate a significant association between *2B/*2B and *4/*4 genotypes and the risk of developing lung cancer among Mexicans.
CYP1A1是一种与高芳烃羟化酶诱导表型相关的基因，该表型是个体间的一种遗传决定变异，与肺癌风险相关。更具体地说，CYP1A12B和4多态性与吸烟者患肺癌的高易感性相关。
从血样中提取DNA，我们通过聚合酶链反应-限制性片段长度多态性分析（PCR-RFLP）研究了来自墨西哥人群的222例肺癌患者和健康对照者中CYP1A12B（n=248）和4（n=222）多态性的分布。
组间比较显示，与对照组（*2B/*2B为1%，4/4为4.4%）相比，肺癌患者中2B/2B（18%；比值比7.6；95%置信区间3.0-19.2）和4/4基因型（15%；比值比11.45；95%置信区间2.19-59.85）的肺癌风险增加。还观察到肺癌与纯合子2B/2B被动吸烟者以及4/4曾经吸烟者（香烟）和被动吸烟者之间存在显著关联（p<0.05）。多变量分析显示2B/2B基因型（比值比6.83）以及4/*4基因型（比值比28.8）的风险增加。
研究结果表明*2B/2B和4/*4基因型与墨西哥人患肺癌的风险之间存在显著关联。
