Women's Natural History Studies
Much of what is known today about HIV/AIDS was learned from long-term natural history studies of gay men, such as the Multicenter AIDS Cohort Study (MAC) and the San Francisco Gay Men's Health Study. Current understanding of modes of transmission, biologic cofactors, behavioral cofactors, acute HIV infection, progression of HIV disease and case definitions of AIDS were derived from these studies. Until recently, no comparable long-term cohort studies had been conducted in women.
Globally, HIV is a disease acquired primarily via heterosexual intercourse. Although the male cohort studies advanced the overall understanding of HIV's behavior, they inevitably were unable to frame or answer basic questions regarding gynecologic manifestations of HIV infection, hormonal considerations in women, or the mechanics and epidemiology of heterosexual, female-to-female and perinatal transmission.
Critical to our current knowledge of the prevalence of HIV infection in women are data obtained from population-based studies of newborns that began in 1986. These studies, funded by the CDC, used anonymous samplings of newborns as a surrogate for uncovering the underlying HIV seroprevalence in women of childbearing age (see "Mandatory Testing" and "Management of HIV-Exposed Newborns" in this issue). These studies established that women living in economically depressed, urban centers throughout the U.S. had substantial seroprevalence of HIV infection (from 2% to 6% of women). Reports by various authors have tracked the epidemiologic status of women, an early example being a publication (JAMA, 1987) authored by Mary Guinan of the CDC, Epidemiology of AIDS in Women in the United States. Early, small cohort studies in women have also contributed to our knowledge base, particularly in the area of gynecologic disease. Carpenter published data in 1991 regarding 200 HIV-positive women followed in Rhode Island. Substantial data regarding abnormal Pap smear findings and risk for dysplasia and cervical cancer in women have been published, although treatment recommendations are lacking (see "Cervical Cancer," "Genital Warts," and "Candidiasis" in this issue). Investigation into the mechanics of maternal-infant HIV transmission led to the intervention study of use of zidovudine to reduce perinatal transmission (ACTG 076).
At the present time, there are various ongoing, longitudinal, natural history or heterosexual transmission studies of HIV in women; for example, EVE, HATS, HERS, WIHS. Women enrolled in these studies receive transportation, up to $80 payment per visit, and other incentives. Still they often complain about the long visits (four to five hours), the blood draws (9 to 10 tubes of blood), and the in-depth initial two-hour interviews asking about everything from anal intercourse, sexual abuse, and domestic violence to menstrual calendar data. What knowledge do we expect to gain over the next five years, and how will that knowledge be used to help women? At this interim point, the following data is emerging from two large cohort studies, WIHS and HERS. It is of enduring importance for consumers, advocates and clinicians to continue to monitor and provide critical input into these studies.
Women's Interagency HIV Study (WIHS)
WIHS is a longitudinal study of 2,080 HIV-positive women and 575 HIV-negative high-risk women enrolled between October 1994 and November 1995. There are WIHS collaborative sites in: the Bronx/Manhattan; Brooklyn; Washington, D.C.; Chicago; San Francisco/Bay Area; and Los Angeles/Southern California/Hawaii. WIHS's objective is to investigate the spectrum of AIDS-defining and other HIV-related conditions in women, the predictors of genital infections and cervical disease, the immunological and clinical correlates of disease progression, risk behaviors, health care utilization, depression, domestic violence and quality of life. To date, WIHS has published substantial abstracted data from the entire cohort and from subcohorts. Some highlights include:
HIV Epidemiology Research Study (HERS)
HERS is a multicenter study of women with or at high risk for HIV infection. Study sites are in Baltimore, the Bronx, Detroit, and Providence, RI. HERS has conducted observational and demographic research in the entire cohort (863 HIV-positive and 430 HIV-negative women) as well as selected subcohort studies. Some significant data thus far, include:
This article was provided by Gay Men's Health Crisis. It is a part of the publication GMHC Treatment Issues. Visit GMHC's website to find out more about their activities, publications and services.