Hormonal Contraception and the Risk of HIV Acquisition: An Individual Participant Data Meta-analysis.


Morrison, CS; Chen, PL; Kwok, C; Baeten, JM; Brown, J; Crook, AM; Van Damme, L; Delany-Moretlwe, S; Francis, SC; Friedland, BA; Hayes, RJ; Heffron, R; Kapiga, S; Karim, QA; Karpoff, S; Kaul, R; McClelland, RS; McCormack, S; McGrath, N; Myer, L; Rees, H; van der Straten, A; Watson-Jones, D; van de Wijgert, JH; Stalter, R; Low, N; (2015) Hormonal Contraception and the Risk of HIV Acquisition: An Individual Participant Data Meta-analysis. PLoS medicine, 12 (1). e1001778. ISSN 1549-1277 DOI: 10.1371/journal.pmed.1001778

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Abstract

Observational studies of a putative association between hormonal contraception (HC) and HIV acquisition have produced conflicting results. We conducted an individual participant data (IPD) meta-analysis of studies from sub-Saharan Africa to compare the incidence of HIV infection in women using combined oral contraceptives (COCs) or the injectable progestins depot-medroxyprogesterone acetate (DMPA) or norethisterone enanthate (NET-EN) with women not using HC. Eligible studies measured HC exposure and incident HIV infection prospectively using standardized measures, enrolled women aged 15-49 y, recorded ≥15 incident HIV infections, and measured prespecified covariates. Our primary analysis estimated the adjusted hazard ratio (aHR) using two-stage random effects meta-analysis, controlling for region, marital status, age, number of sex partners, and condom use. We included 18 studies, including 37,124 women (43,613 woman-years) and 1,830 incident HIV infections. Relative to no HC use, the aHR for HIV acquisition was 1.50 (95% CI 1.24-1.83) for DMPA use, 1.24 (95% CI 0.84-1.82) for NET-EN use, and 1.03 (95% CI 0.88-1.20) for COC use. Between-study heterogeneity was mild (I2 < 50%). DMPA use was associated with increased HIV acquisition compared with COC use (aHR 1.43, 95% CI 1.23-1.67) and NET-EN use (aHR 1.32, 95% CI 1.08-1.61). Effect estimates were attenuated for studies at lower risk of methodological bias (compared with no HC use, aHR for DMPA use 1.22, 95% CI 0.99-1.50; for NET-EN use 0.67, 95% CI 0.47-0.96; and for COC use 0.91, 95% CI 0.73-1.41) compared to those at higher risk of bias (pinteraction = 0.003). Neither age nor herpes simplex virus type 2 infection status modified the HC-HIV relationship. This IPD meta-analysis found no evidence that COC or NET-EN use increases women's risk of HIV but adds to the evidence that DMPA may increase HIV risk, underscoring the need for additional safe and effective contraceptive options for women at high HIV risk. A randomized controlled trial would provide more definitive evidence about the effects of hormonal contraception, particularly DMPA, on HIV risk.

Item Type: Article
Faculty and Department: Faculty of Epidemiology and Population Health > Dept of Infectious Disease Epidemiology
Faculty of Infectious and Tropical Diseases > Dept of Clinical Research
Faculty of Infectious and Tropical Diseases > Dept of Disease Control
Research Centre: Tropical Epidemiology Group
Centre for Maternal, Reproductive and Child Health (MARCH)
PubMed ID: 25612136
Web of Science ID: 351715800004
URI: http://researchonline.lshtm.ac.uk/id/eprint/2047627

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