BACKGROUND: Published data on the association between GSTM1 and GSTT1 polymorphisms and risk of anti-tuberculosis drug-induced liver injury (ATDILI) are inconclusive.OBJECTIVE: To derive a more precise estimation of the relationship, a meta-analysis on this topic was performed.DESIGN: PubMed, Medline, EMBASE and Chinese national knowledge infrastructure were searched for studies on the association of GSTM1 and GSTT1 polymorphisms with risk of ATDILI. Summary odds ratios (ORs) with their corresponding 95% confidence intervals (CIs) were calculated.RESULTS: The GSTM1 null genotype was associated with increased risk of ATDILI (ORrandom-effects 1.50, 95%CI 1.15-1.95). When stratifying for study population and median number of cases, statistically significant results were observed in the Chinese population (ORrandom-effects 1.45, 95%CI 1.12-1.92) and in studies with case numbers > 57 (ORfixed-effects 1.60, 95%CI 1.31-1.97). No statistically significant association was observed between GSTT1 null genotype or GSTM1/GSTT1 interaction and risk of ATDILI.CONCLUSION: The meta-analysis suggests that GSTM1 null genotype may be associated with an increased risk of ATDILI, particularly among the Chinese population. The GSTT1 null genotype or GSTM1/GSTT1 interaction may not affect susceptibility to ATDILI.

BACKGROUND AND OBJECTIVE: A number of studies have evaluated the association between cytochrome P450 2E1 (CYP2E1) RsaI/PstI polymorphism and the risk of anti-tuberculosis drug-induced liver injury (ATDILI). However, the results were inconsistent. We conducted a meta-analysis to clarify the role of this polymorphism in ATDILI.DESIGN: Two authors independently searched the PubMed, Medline, EMBASE and Chinese National Knowledge Infrastructure databases for studies on the association of CYP2E1 RsaI/PstI polymorphism with risk of ATDILI. Summary odds ratios (ORs) with their corresponding 95% confidence intervals (CIs) were calculated.RESULTS: The combined results showed that the CYP2E1 c1/c1 genotype was associated with increased ATDILI risk compared to variant genotypes (c1/c2+c2/c2) (OR 1.36, 95%CI 1.09-1.69). When stratifying for study population, statistically significant results were observed in Chinese (OR 1.47, 95%CI 1.12-1.92) and Korean populations (OR 1.85, 95%CI 1.04-3.30). In comparison with CYP2E1 c1/c2 or c2/c2 with rapid/intermediate acetylators, the risk of ATDILI increased from 1.88 (95%CI 1.14-3.09) for CYP2E1 c1/c1 with rapid/intermediate acetylators to 6.44 (95%CI 3.47-11.97) for CYP2E1 c1/c1 with slow acetylators.CONCLUSION: This meta-analysis suggests that CYP2E1 RsaI/PstI polymorphism may affect susceptibility to ATDILI, particularly among Chinese and Korean populations.