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Previous studies have suggested that the null polymorphism of the glutathione S-transferases M1/T1 (GSTM1/T1) gene may be associated with the risk of developing systemic lupus erythematosus (SLE). We further explored this potential association using a meta-analysis. A systematic literature search was carried out in the scientific literature databases and we used odds ratios (OR) and 95 % confidence intervals (CIs) to evaluate the strength of this association. All statistical analyses were calculated using Stata software 11.0, and Bonferroni correction was used to adjust the p values. Nine eligible articles with 1,850 patients and 2,826 controls were identified. Our results showed the null polymorphism of the GSTM1 gene was associated with SLE in East Asians (OR 1.32, 95 % CI 1.04-1.69, p = 0.024), but not in Europeans and Africans. However, when Bonferroni corrections were applied (p = 0.05/2 = 0.025), we could not be sure of this association. We further analysed the associations between the GSTT1 gene null polymorphism and the risk of SLE. The results of this investigation showed that this null polymorphism was not associated with susceptibility to SLE in all included populations. In conclusion, the null polymorphism of GSTM1/T1 gene may not be associated with the risk of SLE. More studies are needed to confirm this lack of association between key oxidative defense genes and susceptibility to SLE in the future.

Background: Some studies suggested that Glutathione S-transferases M1/T1(GSTM1/T1) null polymorphisms may be associated with the risk of vitiligo., Aims: The purpose of this study is to further evaluate the association between GSTM1/T1 null polymorphisms and the susceptibility to vitiligo., Methods: We carried out a retrieval of studies in the databases. Odds ratios (OR) and 95% confidence intervals (95% CIs) were used to assess the strength of this association. We analyzed the data using Stata 11.0., Results: Six case-control studies including 1358 cases and 1673 controls were included in this meta-analysis. Our overall results showed the GSTM1 or GSTT1 null polymorphism was associated with vitiligo (GSTM1:OR=1.59, 95% CI: 1.21-2.08, P=0.001; GSTT1: OR=1.30, 95% CI: 1.12-1.51, P=0.001). In the subgroup analysis, the GSTM1 null polymorphism might be a genetic risk factor to vitiligo in East Asian (OR=1.71, 95% CI: 1.12-2.63, P=0.014) but not in the Mediterranean, however individuals with the GSTT1 null polymorphism in the Mediterranean (OR=1.76, 95% CI: 1.15-2.71, P=0.010) but not in East Asian have a greater predisposition to vitiligo. In addition there was also a significant trend toward an association with the combination of the GSTM1 null and GSTT1 null in either East Asians or Mediterraneans., Conclusion: The GSTM1/T1 null polymorphisms may be associated with vitiligo. More studies are needed to confirm this conclusion., (Copyright © 2013 Elsevier B.V. All rights reserved.)