Journal
METABOLISM-CLINICAL AND EXPERIMENTAL
Volume 62, Issue 9, Pages 1227-1238Publisher
W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1016/j.metabol.2013.03.003
Keywords
Recurrent miscarriage; Gene polymorphism; ACE I/D; Meta-analysis
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Background. Many studies have investigated the association between angiotensin-converting enzyme (ACE) gene insertion/deletion (I/D) polymorphism and risk of recurrent miscarriage, but the impact is unclear due to inconsistencies among those studies. This study aimed to quantify the strength of the association between ACE I/D polymorphism and recurrent miscarriage risk by performing a systematic review and meta-analysis. Design and Methods. We searched PubMed, Embase, Web of Science, and Wanfang Medicine databases for eligible articles relating the association between ACE I/D polymorphism and risk of recurrent miscarriage in humans. We estimated the summary odds ratios (ORs) with their 95% confidence intervals (95% CIs) to assess the association. Results. Eleven studies with a total of 3357 individuals were included in this meta-analysis. Compared to the ACE II genotype, DD and ID were both associated with increased risk of recurrent miscarriage (OR (DD versus II) = 1.81, 95% CI 1.23-2.66, P = 0.003; OR (ID versus II) = 1.50, 95% CI 1.25-1.80, P < 0.001). Sensitivity analyses further confirmed the association above. No evidence of publication bias was observed. Conclusion. Meta-analyses of available data show a significant association between ACE I/D polymorphism and recurrent miscarriage risk, and the ACE polymorphic D allele contributes to increased risk of recurrent miscarriage. (C) 2013 Elsevier Inc. All rights reserved.
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