Ethics guidance for HIV prevention trials.
Ontology highlight
ABSTRACT:
SUBMITTER: MacQueen KM
PROVIDER: S-EPMC1126736 | biostudies-literature | 2003 Aug
REPOSITORIES: biostudies-literature
Publications
Ethics guidance for HIV prevention trials.
MacQueen Kathleen M KM Karim Quarraisha Abdool QA Sugarman Jeremy J
BMJ (Clinical research ed.) 20030801 7410
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Project description:BackgroundSouth Africa is a major hub of HIV prevention trials, with plans for a licensure trial to start in 2015. The appropriate standards of care and of prevention in HIV vaccine trials are complex and debated issues and ethical guidelines offer some direction. However, there has been limited empirical exploration of South African stakeholders' perspectives on ethical guidance related to prevention and care in HIV vaccine trials.MethodsSite staff, Community Advisory Board members and Research Ethics Committee members involved with current HIV vaccine trials in South Africa were invited to participate in an exploration of their views. A questionnaire listed 10 care and 10 prevention recommendations drawn from two widely available sets of ethical guidelines for biomedical HIV prevention trials. Respondents (n = 98) rated each recommendation on five dimensions: "Familiarity with", "Ease of Understanding", "Ease of Implementing", "Perceived Protection", and "Agreement with" each ethical recommendation. The ratings were used to describe stakeholder perspectives on dimensions for each recommendation. Dimension ratings were averaged across the five dimensions and used as an indication of overall merit for each recommendation. Differences were explored across dimensions, between care-oriented and prevention-oriented recommendations, and between stakeholder groups.ResultsBoth care and prevention recommendations were rated highly overall, with median ratings well above the scale midpoint. In general, informed consent recommendations were most positively rated. Care-related recommendations were rated significantly more positively than prevention-related recommendations, with the five lowest-rated recommendations being prevention-related. The most problematic dimension across all recommendations was "Ease of Implementing," and the least problematic was "Agreement with," suggesting the most pressing stakeholder concerns are practical rather than theoretical; that is, respondents agree with but see barriers to the attainment of these recommendations.ConclusionsWe propose that prevention recommendations be prioritized for refinement, especially those assigned bottom-ranking scores for "Ease of Implementing", and/ or "Ease of Understanding" in order to assist vaccine stakeholders to better comprehend and implement these recommendations. Further qualitative research could also assist to better understand nuances in stakeholder reservations about implementing such recommendations.
| S-EPMC4104735 | biostudies-literature
Project description:OBJECTIVE:Prevention trials for neurodegenerative diseases use genetic or other risk marker tests to select participants but there is concern that this could involve coercive disclosure of unwanted information. This has led some trials to use blinded enrollment (participants are tested but not told of their risk marker status). We examined the ethics of blinded vs transparent enrollment using well-established criteria for assessing the ethics of clinical research. METHODS:Normative analysis applying 4 key ethical criteria-favorable risk-benefit ratio, informed consent, fair subject selection, and scientific validity-to blinded vs transparent enrollment, using current evidence and state of Alzheimer disease (AD) and other prevention trials. RESULTS:Current evidence on the psychosocial impact of risk marker disclosure and considerations of scientific benefit do not support an obligation to use blinded enrollment in prevention trials. Nor does transparent enrollment coerce or involve undue influence of potential participants. Transparent enrollment does not unfairly exploit vulnerable participants or limit generalizability of scientific findings of prevention trials. However, if the preferences of a community of potential participants would affect the rigor or feasibility of a prevention trial using transparent enrollment, then investigators are required by considerations of scientific validity to use blinded enrollment. CONCLUSIONS:Considerations of risks and benefits, informed consent, and fair subject selection do not require the use of blinded enrollment for AD prevention trials. Blinded enrollment in AD prevention trials may sometimes be necessary because of the need for scientific validity, not because it prevents coercion or undue influence.
| S-EPMC4395889 | biostudies-other
Project description:Obtaining the definitive data necessary to determine the safety and efficacy of using antiretroviral treatment (ART) to reduce the sexual transmission of HIV in heterosexual couples encountered an array of ethical challenges that threatened to compromise HIV Prevention Trials Network (HPTN) 052, the multinational clinical trial addressing this issue that has profound public health implications.To describe and analyze the major ethical challenges faced in HPTN 052.The ethical issues and modifications of HPTN 052 in response to these issues were cataloged by the principal investigator, the lead coordinator, and the ethicist working on the trial. The major ethical issues that were unique to the trial were then described and analyzed in light of the published literature as well as guidances and policies. The ethical challenges that must be addressed in many clinical trials, such as those related to obtaining informed consent and making provisions for ancillary care, are not described.When HPTN 052 was being designed, ethical questions emerged related to the relevance of the research question itself given data from observational research and a range of beliefs about the appropriate means of preventing and treating HIV infection and AIDS. Furthermore, ethical challenges were faced regarding site selection since there was a scientific need to conduct the research in settings where HIV incidence was high, but alternatives to study participation should be available. As in most HIV-prevention research, ethical questions surrounded the determination of the appropriate prevention package for all of those enrolled. During the course of the trial, guidance documents and policies emerged that were of direct relevance to the research questions, calling for a balancing of concerns for the research subjects and trial integrity. When the study results were made public, there was a need to ensure access to the treatment shown to be effective that in some cases differed from the guidelines used at the sites where the research was being conducted. In addition, questions were raised about whether there was an obligation to notify subjects about 'unlinked' transmissions of HIV, that is, infections acquired from someone other than the designated sexual partner enrolled in the study.The ethical issues described are limited to those discerned by the authors and not those of other stakeholders who may have identified additional issues or had a different perspective in analyzing them.Understanding the ethical challenges faced in HPTN 052 promises to inform the design and conduct of future complex, long-term clinical trials aimed at addressing critical scientific and public health questions, where data and practice patterns emerge over the course of the trial.
| S-EPMC3486723 | biostudies-other
Project description:BackgroundHIV Vaccine Trials Network (HVTN) 704/085, a placebo-controlled clinical trial assessing the efficacy of VRC01 broadly neutralizing antibody infusion for HIV prevention, offered oral preexposure prophylaxis (PrEP) as the standard of prevention at no cost to participants.MethodsWe characterized features of- identified factors associated with- PrEP initiation and discontinuation, and the effects of PrEP initiation on HIV incidence.ResultsOf 2221 participants, 31.8% initiated oral PrEP during study follow-up, with the highest proportion of PrEP initiations in Brazil (83.2%) and the United States (US) (54.2%). Prior PrEP use was associated with PrEP initiation (hazard ratio [HR], 2.22 [95% confidence interval {CI}, 1.25-3.95]). Participants from Switzerland (HR, 0.5 [95% CI, .3-1.0]) and Peru (HR, 0.08 [95% CI, .06-.1]) had lower likelihood of PrEP initiation compared to the US, while participants from Brazil had higher likelihood (HR, 2.6 [95% CI, 2.0-3.3]). In the US, PrEP initiation was lower in areas with higher unmet need for PrEP (HR, 0.9 per 5 units [95% CI, 0.8-1.0]). PrEP initiators had 58% less risk of acquiring HIV than PrEP noninitiators. Among PrEP initiators, 34.4% discontinued PrEP during study follow-up. Brazil had 63% less likelihood of PrEP discontinuation than the US (HR, 0.37 [95% CI, .22-.60]).ConclusionsWhen included as standard of prevention in HVTN 704/085, oral PrEP utilization patterns mirrored those observed in real-life settings. Variable effects of oral PrEP on HIV outcomes in clinical trials may be expected based on regional differences in oral PrEP use.
| S-EPMC11259185 | biostudies-literature
Project description:BackgroundIn the last decade, several large-scale, clinical trials evaluating the efficacy of novel HIV prevention products have been completed, and eight are currently underway or about to be reported. Little attention has been given in the literature to the level of protection sufficient to warrant introduction, and there is concern that using the term "efficacy" to describe the effect of user-controlled methods such as microbicides may mislead policymakers.DesignWe review how the fields of family planning, vaccine science and mathematical modelling understand and use the terms efficacy and effectiveness, and explore with simple mathematical models how trial results of user-controlled products relate to common understandings of these terms.ResultsEach field brings different assumptions, a different evidence base and different expectations to interpretations of efficacy and effectiveness - a reality that could cloud informed assessment of emerging data.ConclusionWhen making judgments on the utility of new health technologies, it is important to use standards that yield appropriate comparisons for the innovation and that take into account the local epidemic and available alternatives.
| S-EPMC3775591 | biostudies-literature
Project description:Adherence is a critical component of the success of antiretroviral-based pre-exposure prophylaxis (PrEP) in averting new HIV-infections. Ensuring drug availability at the time of potential HIV exposure relies on self-directed product use. A deeper understanding of how to best support sustained PrEP adherence remains critical to current and future PrEP efforts. This paper provides a succinct synthesis of the adherence support experiences from four pivotal PrEP trials--Centre for the AIDS Programme of Research in South Africa (CAPRISA) 004, FEM-PrEP, Iniciativa Prophylaxis (iPrEx), and Vaginal and Oral Interventions to Control the Epidemic (VOICE). Notwithstanding variability in the design, population/cohort, formulation, drug, dosing strategy, and operationalization of adherence approaches utilized in each trial, the theoretical basis and experiences in implementation and monitoring of the approaches used by these trials provide key lessons for optimizing adherence in future research and programmatic scale-up of PrEP. Recommendations from across these trials include participant-centered approaches, separating measurement of adherence from adherence counseling, incorporating tailored strategies that go beyond education, fostering motivation, and addressing the specific context in which an individual incorporates and negotiates PrEP use.
| S-EPMC3672509 | biostudies-literature
Project description:ObjectivesVigorous discussions are ongoing about future efficacy trial designs of candidate human immunodeficiency virus (HIV) prevention interventions. The study design challenges of HIV prevention interventions are considerable given rapid evolution of the prevention landscape and evidence of multiple modalities of highly effective products; future trials will likely be 'active-controlled', i.e., not include a placebo arm. Thus, novel design approaches are needed to accurately assess new interventions against these highly effective active controls.MethodsTo discuss active control design challenges and identify solutions, an initial virtual workshop series was hosted and supported by the International AIDS Enterprise (October 2020-March 2021). Subsequent symposia discussions continue to advance these efforts. As the non-inferiority design is an important conceptual reference design for guiding active control trials, we adopt several of its principles in our proposed design approaches.ResultsWe discuss six potential study design approaches for formally evaluating absolute prevention efficacy given data from an active-controlled HIV prevention trial including using data from: 1) a registrational cohort, 2) recency assays, 3) an external trial placebo arm, 4) a biomarker of HIV incidence/exposure, 5) an anti-retroviral drug concentration as a mediator of prevention efficacy, and 6) immune biomarkers as a mediator of prevention efficacy.ConclusionsOur understanding of these proposed novel approaches to future trial designs remains incomplete and there are many future statistical research needs. Yet, each of these approaches, within the context of an active-controlled trial, have the potential to yield reliable evidence of efficacy for future biomedical interventions.
| S-EPMC10798828 | biostudies-literature
Project description:BackgroundOur human societies and certainly also (bio) medicine are more and more permeated with technology. There seems to be an increasing awareness among bioethicists that an effective and comprehensive approach to ethically guide these emerging biomedical innovations into society is needed. Such an approach has not been spelled out yet for bioethics, while there are frequent calls for ethical guidance of biomedical innovation, also by biomedical researchers themselves. New and emerging biotechnologies require anticipation of possible effects and implications, meaning the scope is not evaluative after a technology has been fully developed or about hypothetical technologies, but real-time for a real biotechnology.Main textIn this paper we aim to substantiate and discuss six ingredients that we increasingly see adopted by ethicists and that together constitute "ethics parallel research". This approach allows to fulfil two aims: guiding the development process of technologies in biomedicine and providing input for the normative evaluation of such technologies. The six ingredients of ethics parallel research are: (1) disentangling wicked problems, (2) upstream or midstream ethical analysis, (3) ethics from within, (4) inclusion of empirical research, (5) public participation and (6) mapping societal impacts, including hard and soft impacts. We will draw on gene editing, organoid technology and artificial intelligence as examples to illustrate these six ingredients.ConclusionEthics parallel research brings together these ingredients to ethically analyse and proactively or parallel guide technological development. It widens the roles and judgements from the ethicist to a more anticipatory and constructively guiding role. Ethics parallel research is characterised by a constructive, rather than a purely critical perspective, it focusses on developing best-practices rather than outlining worst practice, and draws on insights from social sciences and philosophy of technology.
| S-EPMC7461257 | biostudies-literature
Project description:The design of studies evaluating the safety and efficacy of interventions for HIV prevention is challenging in the US context, where there is low generalized prevalence. HIV incidence is sufficiently high in the at-risk US population of men who have sex with men that prevention trials using HIV infection end points are feasible. In other US populations at higher risk of HIV exposure, efficacy trials of HIV prevention are likely not feasible. However, for interventions where efficacy is already established, conducting trials that test different implementation strategies in these populations could provide definitive evidence about how to achieve high levels of coverage.
| S-EPMC3298818 | biostudies-other
Project description:HIV Prevention Trials Network 052 demonstrated that antiretroviral therapy (ART) prevents HIV transmission in serodiscordant couples. HIV from index-partner pairs was analyzed to determine the genetic linkage status of partner infections. Forty-six infections were classified as linked, indicating that the index was the likely source of the partner's infection. Lack of viral suppression and higher index viral load were associated with linked infection. Eight linked infections were diagnosed after the index started ART: 4 near the time of ART initiation and 4 after ART failure. Linked infections were not observed when the index participant was stably suppressed on ART.
| S-EPMC5140698 | biostudies-literature