摘要： 应用PCR产物直接测序的方法，检测山东省胃癌高发的临朐人群和低发的苍山人群中Lewis基因多态性T59G的分布,旨在探讨山东临朐和苍山地区胃癌发病率显著不同的内在原因，为阐明临朐地区胃癌高发的机制提供实验依据。结果表明,T59G突变个体在临朐和苍山人群中的分布频率分别为34.5%和31.6%，差别无统计学意义，P＞0.05,OR为1.14 （95% CI,0.59~2.19）。提示就此点突变而言，临朐人群和苍山人群为同一人群，具有极其相似的遗传背景；T59G不能作为区分临朐和苍山人群的遗传标志，与这两个地区胃癌发病的区别没有相关性。
Abstract:To explore the cause leading to the difference in incidence of gastric cancer between Linqu and Cangshan populations,Shandong Province,and to provide evidence for the possible mechanism of high incidence of gastric cancer in Linqu County,the distribution of T59G mutation in Lewis gene was screened between Linqu and Cangshan populations by PCR-sequencing.The frequency of individuals with T59G mutation was 34.5% in Linqu population and 31.6% in Cangshan population,respectively,with no significant difference,P＞0.05,and OR is 1.14 (95% CI,0.59~2.19).This suggests that Linqu and Cangshan populations may share the same genetic background.T59G mutation of Lewis gene could not be used as a genetic marker for Linqu and Cangshan populations and is not relevant to the difference in incidence of gastric cancer between them.