In the battle against HIV/AIDS conditions on the frontlines are constantly in flux as treatment, research and policy evolve. The landmark HIV Prevention Trials Network (HPTN) 052 study, which established that antiretroviral treatment in people who are HIV positive decreases the likelihood of transmitting HIV to their sexual partners, was no exception. One year after publication the study serves as a case study of ethical challenges faced at every stage of the research trial process in the new paper "Establishing HIV treatment as prevention in the HIV Prevention Trials Network 052 randomized trial: an ethical odyssey," published in the June 2012 issue of Clinical Trials.
HPTN 052 was designed to investigate two questions related to the use of antiretroviral treatment (ART). First, can ART be used to prevent sexual transmission of the HIV virus, and second, is earlier use of ART better for the health of someone who is already HIV positive? In 2007, the full trial began at 13 sites in 9 countries, with 1763 couples enrolled. In each couple, one partner was HIV-positive and one HIV-negative.
"HPTN 052 provides useful real-world examples of the types of ethical difficulties faced when conducting research that has profound implications for public health and how these difficulties can be managed in order to both protect the participants and do good science," says Jeremy Sugarman, MD, MPH, MA, co-author of the paper and deputy director for medicine of the Johns Hopkins Berman Institute of Bioethics.
To address the research questions, study participants were randomly assigned to two groups - one that would receive ART earlier, and the other at a later stage of HIV progression. This became a source of ethical tensions as the trial progressed and enthusiasm for earlier ART treatment grew, whereas previously it had been considered potentially unsafe. For example, in November 2009 the World Health Organization (WHO) issued new guidelines recommending that ART treatment begin earlier.
The deliberation and evolving guidance on ART treatment "brought into sharp focus the ethical tensions inherent to a moral obligation to intervene and the sometimes-conflicting need for gathering data to develop evidence-based practices," write Sugarman and his co-authors Myron S. Cohen, MD, and MaryBeth McCauley, M.P.H.