title: Genetic thrombophilias and preeclampsia: a meta-analysis.
abstract: OBJECTIVE
  To assess the relationship between the factor V Leiden (1691 G-A) single nucleotide polymorphism (SNP), the methylene tetrahydrofolate reductase (MTHFR) 677 C-T SNP, and the prothrombin 20210 G-A SNP and the risk of preeclampsia, by conducting a meta-analysis of all case-control studies with data on these polymorphisms and the risk of preeclampsia.
  
  
  METHODS
  MEDLINE (1966 to November 2002), EMBASE (1980 to November 2002). Search terms included "preeclampsia," "thrombophilia," "factor V Leiden," "protein C," "MTHFR," "methylenetetrahydrofolate reductase," "homocysteine," and "prothrombin gene 20210."
  
  
  METHODS
  Case-control studies of genetic thrombophilias and preeclampsia were included.
  
  
  RESULTS
  We identified 349 titles and reviewed 47 articles for inclusion and exclusion criteria. Thirty-one studies with 7,522 patients were included in the meta-analysis. Data from patients characterized as having severe preeclampsia were extracted and analyzed separately. The pooled odds ratio (OR) for the association of factor V Leiden and all cases of preeclampsia was 1.81 (95% confidence interval [CI] 1.14-2.87) and 2.24 (95% CI 1.28-3.94) for cases of severe preeclampsia. The pooled OR for the MTHFR 677 TT genotype and all preeclampsia was 1.01 (95% CI 0.79-1.29) and 1.38 (95% CI 0.93-2.06) for severe preeclampsia. The OR for the prothrombin 20210 polymorphism and all preeclampsia was 1.37 (95% CI 0.72-2.57) and 1.98 (.94-4.17) for severe preeclampsia.
  
  
  CONCLUSIONS
  This meta-analysis suggests that the factor V Leiden SNP is associated with an increased risk of preeclampsia. Further studies are warranted to determine whether subgroups of high-risk women should be screened for this mutation.
authors.affiliation: Renal Division, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
authors.forename: Julie
authors.initials: J
authors.lastname: Lin
authors.forename: Phyllis
authors.initials: P
authors.lastname: August
mesh_terms: D016022:Case-Control Studies; D005165:Factor V / Q000235:genetics*; D005260:Female; D005819:Genetic Markers; D006801:Humans; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D011225:Pre-Eclampsia / Q000097:blood / Q000235:genetics*; D011247:Pregnancy; D011516:Prothrombin / Q000235:genetics*; D012307:Risk Factors; D019851:Thrombophilia / Q000175:diagnosis / Q000235:genetics*
chemical_list: D005819:Genetic Markers; C095381:factor V Leiden; D005165:Factor V; D011516:Prothrombin; D042965:Methylenetetrahydrofolate Reductase (NADPH2)