Type of Combined Contraceptives, Factor V Leiden Mutation and Risk of Venous Thromboembolism

Abstract

Objective This article estimates the interaction between types of combined hormonal contraception (CHC) and factor V Leiden (FVL) mutation on the risk of venous thrombosis event (VTE).

Subjects and Methods All premenopausal women with first incident VTE who were referred to our unit (Paris, France) between 2000 and 2009 were included in this case-only study. Differences in interactions by progestin type were assessed on a multiplicative scale, assuming the independence of genotype and prescription of type of CHC.

Results Among 2,613 women with VTE, 15.9% had a FVL and 69% used CHC. The interaction between CHC use and presence of FVL on VTE risk was statistically significant (1.37, 1.06–1.77 95% confidence interval [CI]). This interaction appeared higher for drospirenone 1.99 (1.18–3.38 95% CI) (n = 98) or cyproterone acetate users 1.71 (1.20–2.45 95% CI) (n = 326), but not significant for 1st or 2nd or norgestimate CHC users. The results were similar when excluding women with a family history of VTE or with provoked VTE. In this sub-group of women, these interactions appeared higher for third generation, cyproterone acetate and drospirenone CHC users as compared with 1st or 2nd or norgestimate CHC users (odds ratio [OR], 1.68 [1.04–2.70; 95% CI], 2.91 [1.71–4.95 95% CI], 3.22 [1.54–6.73 95% CI], respectively).

Conclusion Our results show that the interaction between FVL and CHC use differ by progestin type, which is higher in CHC containing third-generation progestin, drospirenone or cyproterone acetate, compared with second generation. Further studies are needed to assess the cost-effectiveness of biological thrombophilia screening (FVL) when such prescription of CHC is planned.

Keywords

venous thrombosis - combined contraception - factor V Leiden mutation - epidemiology

Authors' Contributions

G.P.-B.: Conception, design, inclusion of patients, analysis, interpretation of data and revision of the manuscript. J.H.-R.: Analysis, interpretation of data and writing the manuscript. M.-H.H., J.C.: Collection of data, inclusion of patients, performing all biological analysis, interpretation of data and revision of the manuscript. A.G.: Interpretation of data and revision of the manuscript.

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