A functional polymorphism of lymphotoxin-alpha (LTA) gene rs909253 is associated with gastric cancer risk in an Asian population

Background: The potentially functional polymorphism, rs909253 (+252G>A), in the intron region of the LT-alpha (TNF-beta) gene has been implicated in the risk of gastric cancer (GC) in some individually published studies, but others have shown inconsistent and inconclusive results. Methods: We conducted a meta-analysis to assess the association between the lymphotoxin-alpha gene (LTA) + 252 (G>A) polymorphism and gastric cancer susceptibility. Results: We demonstrate that there were no significant associations in single-locus analysis between the polymorphism of LTA and gastric cancer risk in all subjects; however, when studies were stratified by ethnicity, these polymorphisms of LTA were found to be associated with a significant cancer risk in different genetic models in an Asian population (heterozygote [GA genotype] comparison: odds ratio [OR] = 1.29, 95% confidence interval [CI]: 1.01-1.65, P = 0.038) in which the risk in the subjects was more than 70% (12 studies with 2074 cases and 3690 controls). Moreover, the susceptibility to gastric carcinogenesis has a substantial influence on the population-attributable risk by modulating the effects of environmental risk factors such as Helicobacter pylori infection (OR = 1.77, 95%CI: 1.05-2.99, P = 0.032). Conclusions: The present meta-analysis results suggest that the LTA rs909253 GA genotype is a possible risk factor for developing gastric cancer in the Asian population, especially those with H. pylori infection. (C) 2012 Elsevier Ltd. All rights reserved.