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The aim of this study was to investigate the relationship between recurrent miscarriages and factor V Leiden, prothrombin G20210A and C677T methylenetetrahydrofolate reductase (MTHFR) mutations. In this case-control study the prevalence of factor V Leiden, prothrombin G20210A and C677T methylenetetrahydrofolate reductase mutations was determined in a consecutive series of 80 recurrent miscarriage patients and 100 controls. Fifteen of 80 recurrent miscarriage patients and four out of 100 controls carried the factor V Leiden mutation (19 versus 4%, P = 0.003, odds ratio 5.5, 95% confidence interval (CI): 1.7-17). Seven of 80 recurrent miscarriage patients and two of 100 controls were carriers of the prothrombin G20210A mutation (9 versus 2%, P = 0.038, odds ratio 4.6, 95% CI: 0.9-23.2). Six of 80 recurrent miscarriage women and 15 of 100 controls were homozygotes for the C677T MTHFR mutation (8 versus 15%, P = 0.134, odds ratio: 0.4, 95% CI: 0.1-1.2). Our results suggest that the presence of factor V Leiden and prothrombin G20210A polymorphism, but not MTHFR C677T homozygosity, could be additional risk factors for recurrent miscarriages. Furthermore, it was suggested that the prevalence of factor V Leiden and prothrombin G20210A mutations is more prominent in second trimester, primary fetal losses and it is independent of the existence of additional pathology predisposing to recurrent fetal losses.

Factor V Leiden and prothrombin G20210A mutations, but not methylenetetrahydrofolate reductase C677T, are associated with recurrent miscarriages