Skip Navigation LinksHome > July 17, 2013 - Volume 27 - Issue 11 > Risk behavior among women enrolled in a randomized controlle...
doi: 10.1097/QAD.0b013e328360c83e
Clinical Science

Risk behavior among women enrolled in a randomized controlled efficacy trial of an adenoviral vector vaccine to prevent HIV acquisition

Novak, Richard M.a; Metch, Barbarab; Buchbinder, Susanc; Cabello, Robinsond; Donastorg, Yeycye; Figoroa, John-Peterf; Adbul-Jauwad, Henda; Joseph, Patriceg; Koenig, Ellenh; Metzger, Davidi; Sobieszycz, Magdaj; Tyndall, Markk; Zorilla, Carmenl

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Objectives: Report of risk behavior, HIV incidence, and pregnancy rates among women participating in the STEP study, which is a phase IIB trial of MRKAd5 HIV-1 gag/pol/nef vaccine in HIV-negative individuals who were at high risk of HIV-1.

Design: Prospective multicenter, double-blinded, placebo-controlled trial.

Methods: Women were from North American, and from Caribbean and South America (CSA) sites. Risk behavior was collected at screening and 6-month intervals. Differences in characteristics between groups were tested with chi-square, two-sided Fisher's exact tests, and Wilcoxon rank-sum tests. Generalized estimating equation models were used to assess behavioral change.

Results: Among 1134 enrolled women, the median number of male partners was 18; 73.8% reported unprotected vaginal sex, 15.9% unprotected anal sex and 10.8% evidence of a sexually transmitted infection in the 6 months prior to baseline. With 3344 person-years of follow-up, there were 15 incident HIV infections: incidence rate was 0.45 per 100 person-years [95% confidence interval (CI) 0.25, 0.74]. Crack cocaine use in both regions [relative risk (RR) 2.4 (1.7, 3.3)] and in CSA, unprotected anal sex [RR 6.4 (3.8, 10.7)], and drug use [RR 4.1 (2.1, 8.0)] were baseline risk behaviors associated with HIV acquisition. There was a marked reduction in risk behaviors after study enrollment with some recurrence in unprotected vaginal sex. Of 963 nonsterilized women, 304 (31.6%) became pregnant.

Conclusion: Crack cocaine use and unprotected anal sex are important risk criteria to identify high-risk women for HIV-efficacy trials. Pregnancy during the trial was a common occurrence and needs to be considered in trial planning for prevention trials in women.

© 2013 Lippincott Williams & Wilkins, Inc.


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