Objective MicroRNA plays a vital role in gene expression,and microRNA dysregulation is involved in carcinogenesis.The miR- 196a-2 polymorphism rsll614913 is reportedly associated with cancer susceptibility.This meta-analysis was performed to assess the overall association of miR-196a-2 with cancer risk. Methods A total of 27 independent case-control studies involving 10,435 cases and 12,075 controls were analyzed for the rsll614913 polymorphism. Results A significant association was found between rsll614913 polymorphism and cancer risk in four genetic models(CT vs.TT, OR=1.15,95%CI=1.05-1.27;CC vs.TT,OR=1.23,95%CI=1.08-1.39;Dominant model,OR=1.17,95%CI=1.06-1.30;Additive model, OR=1.08,95%CI=1.01-1.14).In the subgroup analysis of different tumor types,the C allele was associated with increased risk of lung, breast,and colorectal cancer,but not with liver,gastric,or esophageal cancer.In the subgroup analysis by ethnicity,a significantly increased risk of cancer was found among Asians in all genetic models,but no associations were found in the Caucasian subgroup. Conclusions The meta-analysis demonstrated that the miR-196a-2 polymorphism is associated with cancer susceptibility,especially lung cancer,colorectal cancer,and breast cancer among Asian populations.
