Vaginal microbicides currently in clinical trials may be the only weapon that will protect women against infection from HIV. Yet, under likely circumstances, these microbicides may be of more benefit to men than women, according to a new UCLA AIDS Institute study.
The study, which used novel mathematical models to simulate clinical trials and population-level transmission of HIV, appears July 7 in the online issue of Proceedings of the National Academy of Sciences.
"At the moment, there is absolutely nothing that women can do to protect themselves from HIV —condoms are not in women's control," said senior study author Sally Blower, professor of psychiatry and biobehavioral sciences at the Semel Institute for Neuroscience and Human Behavior at UCLA and a member of the UCLA AIDS Institute. "Drug companies are developing vaginal microbicides to provide direct protection to women and basically empower them so women have some preventive measure that's under their control."
Microbicides are compounds that can be applied inside the vagina to protect against HIV and other sexually transmitted diseases. Pharmaceutical companies are currently conducting trials of second-generation microbicides that are based on antiretroviral, or ARV, drugs, Blower noted.
The UCLA study raises concerns that microbicides could lead to drug resistance if they are used by HIV-positive women and that this risk may be masked under current clinical trial designs — necessitating significant caution if the microbicides are licensed for use by the general public.
The researchers developed the mathematical models to determine if ARV-based microbicides that could cause moderate to high levels of drug resistance might pass clinical trials. They used epidemiological, clinical and behavioral data to construct models for both clinical trials and heterosexual transmission of HIV.
The models were based on the Phase 3 clinical trial for second-generation microbicides now under way in South Africa, Tanzania, Rwanda and Belgium. This trial is a 12-month, placebo-controlled study involving 10,000 participants.
The researchers developed simulations for two scenarios: one for high-risk microbicides, in which there is a high probability that the vagina will absorb dapivirine, the ARV drug in the microbicide; the other for low-risk microbicides, with a low probability of absorption. The team created the two scenarios because it is not currently known if ARV-based microbicides will be low- or high-risk.
The researchers found that men would likely benefit more than women if the microbicides' efficacy for women was less than 50 percent and if adherence was less than 60 percent. This would occur if HIV-positive women used microbicides and developed drug-resistant strains of HIV that are then less likely to be transmitted to men.
In the high-risk scenario, for instance, the microbicide could prevent infection in up to 21 percent of women and up to 27 percent of men. In the low-risk scenario, the microbicide would be of less benefit, preventing infection in up to 17 percent of women and 18 percent of men.
"The antiretroviral drugs within these microbicides are the same as those used to treat people who are infected with HIV, so there is great expectation that these microbicides will be very effective," said first author Dr. David Wilson, of the National Centre in HIV Epidemiology and Clinical Research at Australia's University of New South Wales. "But the concern is that these microbicides are going to lead to drug resistance," he said.
The concern about drug resistance arises from the fact that women in the current clinical trial are being tested once a month for HIV infection and those found to be infected are dropped from the trial, according to researchers.
"Since monthly testing will take place in the dapivirine trial, we predict that few, if any, cases of acquired resistance will arise during the trial, even if the drug is readily absorbed (i.e., the microbicide is high risk)," the researchers write. "Therefore our analyses have shown that high-risk microbicides could pass Phase III trials, as their potential to cause resistance will be masked by frequent testing."
Other authors of the study are Paul Coplan, of the University of Pennsylvania School of Medicine, and Mark Wainberg, of McGillUniversity's AIDS Centre at Montreal's Jewish General Hospital.
The International Partnership for Microbicides, the National Institute of Allergy and Infectious Diseases, and the Australian Research Council funded this study.
Source: University of California, Los Angeles (UCLA), Health Sciences
Dear Helpdesk: Working in a Toxic Health Care Environment
March 28th 2024Dear Helpdesk is your steadfast companion, offering life coaching and workplace advice from 2 seasoned IPs for some of your most challenging real-life situations. Let us help you navigate the intersection between work and life, guiding you to navigate the dynamic world of infection prevention with confidence and grace. This article is on handling a toxic health care environment.
Product Locator: Spring and Early Mother's Day Gift Guide for Infection Prevention Personnel
March 27th 2024Whether it's a spring holiday, birthdays, or no reason at all, infection prevention personnel love to give and receive gifts that help at the end of a stressful day. Infection Control Today® offers some gift ideas for infection prevention personnel and their families.
Catching Up With Vangie Dennis, AORN 2022-2023 President at AORN 2024
March 26th 2024Infection Control Today (ICT) had the privilege of catching up with Vangie Dennis, MSN, RN, CNOR, CMLSO, at the Association of periOperative Registered Nurses' (AORN’s) International Surgical Conference & Expo 2024. As the former president of AORN and an esteemed figure in perioperative services, Vangie Dennis shared insights into her recent endeavors and the exciting new chapter she's embarked upon.
How To Optimize Your Time Management Strategies for the Busy Infection Preventionist
March 25th 2024Is your calendar resembling a chaotic masterpiece of overlapping tasks? Join the club of infection preventionists striving to balance responsibilities. Dive into proven strategies from a fellow infection preventionist to reclaim control of your time, streamline tasks, and boost productivity effectively. This is an IP Lifeline article.