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To clarify the role of glutathione S-transferases (GSTs; GSTM1 and GSTT1) status in susceptibility to coronary heart disease (CHD), a meta-analysis of published studies was performed. A total of 19 studies including 8020 cases and 11 501 controls were included in this meta-analysis. In a combined analysis, the relative risks for CHD of the GSTM1 null and GSTT1 null polymorphisms were 1.47 [95% confidence interval (CI): 1.08-2.01] and 1.26 (95% CI: 0.90-1.75), respectively. Three potential sources of heterogeneity including ethnicity, source of control and sample size of study were also assessed. However, no significant association was found in stratified analyses. By pooling data from eight studies (2909 cases and 3745 controls) that considered combinations of GSTT1 and GSTM1 genotypes, a statistically significant increased risk for CHD [odds ratio (OR = 2.38, 95% CI: 1.03-5.48)] was detected for individuals with combined deletion mutations in both genes compared with positive genotypes. Results from the meta-analysis of five studies on GSTs stratified according to smoking status showed an increased risk for individuals with null genotype (OR = 2.21, 95% CI: 1.24-3.92 for GSTM1 and OR = 3.29, 95% CI: 1.49-7.26 for GSTT1) versus non-null genotypes. This meta-analysis suggests that the GSTM1 null genotype may slightly increase the risk of CHD and that interaction between unfavourable GSTs genotypes may exist.

Genetic polymorphisms of glutathione S-transferase genes GSTM1, GSTT1 and risk of coronary heart disease