Hormonal contraception and the risk of HIV acquisition: an individual participant data meta-analysis

Charles S Morrison, Pai-Lien Chen, Cynthia Kwok, Jared M Baeten, Joelle Brown, Angela M Crook, Lut Van Damme, Sinead Delany-Moretlwe, Suzanna C Francis, Barbara A Friedland, Richard J Hayes, Renee Heffron, Saidi Kapiga, Quarraisha Abdool Karim, Stephanie Karpoff, Rupert Kaul, R Scott McClelland, Sheena McCormack, Nuala McGrath, Landon MyerHelen Rees, Ariane van der Straten, Deborah Watson-Jones, Janneke H H M van de Wijgert, Randy Stalter, Nicola Low

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

BACKGROUND: 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.

METHODS AND FINDINGS: 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 (I(2) < 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 (p(interaction) = 0.003). Neither age nor herpes simplex virus type 2 infection status modified the HC-HIV relationship.

CONCLUSIONS: 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.

Original languageEnglish
Article numbere1001778
Number of pages26
JournalPLoS Medicine
Volume12
Issue number1
DOIs
Publication statusPublished - Jan 2015

Keywords

  • Adolescent
  • Adult
  • Africa South of the Sahara/epidemiology
  • Contraceptive Agents, Female/administration & dosage
  • Female
  • HIV Infections/epidemiology
  • Humans
  • Incidence
  • Medroxyprogesterone Acetate/administration & dosage
  • Middle Aged
  • Norethindrone/administration & dosage
  • Risk Factors

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