Adolescent pre-exposure prophylaxis for HIV prevention: current perspectives
Authors Machado DM, de Sant'Anna Carvalho AM, Riera R
Received 26 March 2017
Accepted for publication 25 August 2017
Published 29 November 2017 Volume 2017:8 Pages 137—148
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 2
Editor who approved publication: Professor Alastair Sutcliffe
Daisy Maria Machado,1 Alexandre Machado de Sant’Anna Carvalho,2 Rachel Riera3
1Disciplina de Infectologia Pediátrica, Departamento de Pediatria, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, 2Universidade Federal do Rio de Janeiro, Rio de Janeiro, 3Disciplina de Medicina Baseada em Evidências, Departamento de Medicina, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
Abstract: Adolescents are a critical population that is disproportionately impacted by the HIV epidemic. More than 2 million adolescents between the age group of 10 and 19 years are living with HIV, and millions are at risk of infection. HIV risks are considerably higher among girls, especially in high-prevalence settings such as eastern and southern Africa. In addition to girls, there are other vulnerable adolescent subgroups, such as teenagers, who use intravenous (IV) drugs, gay and bisexual boys, transgender youth, male sex workers, and people who fall into more than one of these categories. Pre-exposure prophylaxis (PrEP) is a new intervention for people at high risk for acquiring HIV, with an estimated HIV incidence of >3%. Recent data from trials show evidence of the efficacy of PrEP as a powerful HIV prevention tool in high-risk populations, including men who have sex with men, HIV-1-serodiscordant heterosexual couples, and IV drug users. The reported efficacy in those trials of the daily use of oral tenofovir, alone or in combination with emtricitabine, to prevent HIV infection ranged from 44% to 75% and was heavily dependent on adherence. Despite the proven efficacy of PrEP in adult trials, concerns remain about its feasibility in real-life scenarios due to stigma, cost, and limited clinician experience with PrEP delivery. Recent studies are attempting to expand the inquiry into the efficacy of such HIV prophylaxis approaches in adolescent populations, but there are still many gaps in knowledge, and no country has yet approved it for use with adolescents. The aim of this review was to identify and summarize the evidence from studies on PrEP for adolescents. We have compiled and reviewed published studies focusing on safety, feasibility, adherence to therapeutics, self-perception, and legal issues related to PrEP in people aged between 10 and 24 years.
Keywords: HIV prevention, pre-exposure prophylaxis (PrEP), adolescents, youth
Adolescents are a critical population that is disproportionately impacted by the HIV epidemic. AIDS is the leading cause of death among adolescents in sub-Saharan Africa and is the second cause of mortality among youth worldwide.1 Over 2 million adolescents between the age group of 10 and 19 years are living with HIV, and millions more are at risk of infection every year.2
Due to fundamental neurological, psychological, and behavioral changes that take place during adolescence,3 this group is considered highly vulnerable to contracting HIV.4,5 Infection risks are considerably higher among girls, especially in high-prevalence settings such as eastern and southern Africa. Due to preexisting, gender-based inequalities such as exclusion and sexual violence, this subgroup is disproportionately affected by HIV. In 2013, two-thirds of new HIV infections reported in people between the age group of 15 and 19 years were adolescent girls, particularly in sub-Saharan Africa.6
Furthermore, besides young women, there are other youth populations that exhibit distinct sociobehavioral patterns that increase their risk to contracting the virus, such as intravenous drug users, gay and bisexual-identifying teenagers, adolescent sex workers, and those who belong to multiple risk categories. Their public health outcomes can be influenced by evidence-based primary preventive strategies, so the focus should be on them.
Goal #3 of the United Nations’ “Sustainable Development Goals” (SDG3) – to ensure healthy lives and promote well-being for all ages – requires as a target that by 2030 there should be an end to the epidemic of AIDS. To achieve this ambitious goal, each age group, population, and geographical location will require specific and flexible strategies.7
Pre-exposure prophylaxis (PrEP) as an HIV prevention strategy
PrEP is a new intervention for people at high risk to contracting HIV, with an estimated HIV incidence of >3%, based on the use of oral antiretroviral medications to help prevent the infection. A daily use of two combined antiretroviral drugs (tenofovir disoproxil fumarate [TDF]/emtricitabine [FTC]) was approved as PrEP in 2012, sold under the name Truvada®.8
Recent data from clinical trials have demonstrated the efficacy of PrEP as a powerful HIV prevention tool in some high-risk populations including men who have sex with men,9 HIV-1-serodiscordant heterosexual couples,10 and intravenous drug users.11 PrEP effectively reduced HIV infection in four of six trials conducted with the adult population.9–11 The reported efficacy in those randomized trials using TDF as a single agent or in combination with FTC to prevent HIV infection ranged from 44% to 75% and was heavily dependent on patient adherence (Table 1).
Table 1 Clinical trials of PrEP in the population at risk of HIV infection
Abbreviations: FTC, emtricitabine; PrEP, pre-exposure prophylaxis; iPrEx, PrEP initiative; TDF, tenofovir disoproxil fumarate.
The Phase III randomized clinical trial PrEP initiative (iPrEx) highlighted the importance of adherence with overall protective efficacy of 44%, but as high as 92% in those with detectable drug levels.9 Two trials (the FEMPrEP12 and VOICE13) showed no significant protective effect in women, yet less than 30% adhered to the prescribed intervention, as observed through drug concentration analysis.
Despite the proven efficacy of PrEP in adult trials, there are concerns about real-life feasibility due to several barriers including stigma, cost, and limited experience in PrEP delivery by HIV providers. However, some of these concerns abated after demonstration projects showed high clinical effectiveness (>80%).14,15
Recent studies are attempting to expand the investigation into the efficacy of such HIV prophylaxis approaches in adolescent populations. However, there are still many knowledge gaps, and no country has yet approved it for use with adolescents. Guidelines have recommended the use of PrEP as part of prevention for persons at substantial risk for HIV infection without limiting the recommendations to specific populations.16
The aim of this review was to identify and summarize the evidence from studies on PrEP for adolescents. We mapped published studies focusing on the safety, feasibility, acceptability, adherence to therapeutics, self-perception, and legal issues related to PrEP in people aged between 10 and 24 years.
Criteria for considering studies for this review
Type of studies
We considered the following study designs for inclusion:
- Primary studies, such as randomized, quasi-randomized, and nonrandomized clinical trials, longitudinal observational (historical cohorts, prospective cohorts, case–control, and before-and-after studies), analytic cross-sectional studies, and non-comparative studies (case and series reports or single experimental cohorts).
- Secondary studies, including systematic reviews, guidelines, or economic evaluations. We did not consider narrative reviews, case reports, comments, or editorials.
Type of participants
Although the focus was primarily on the second decade of life, in some cases data on youth or young people were included. This inclusion is generally due to data being aggregated in ways that did not distinguish adolescent years specifically.
Defining overlapping terms “adolescents,” “youth,” and “young people”
The World Health Organization (WHO) defines adolescent as those people between 10 and 19 years of age. The United Nations define youth as 15–24 years, and the term “young people” is used by WHO and others to combine adolescents and youth.17
Outcomes of interest
We considered all effectiveness and safety outcomes for therapeutic studies addressing PrEP use. For all studies, we collected data linking PrEP use to adherence, adolescent self-perception, satisfaction, health care provider attitudes related to youth, and legal issues.
Strategy for searching studies
We conducted a systematic search of studies on 23 and 24 January 2017 in the following databases: MEDLINE (via PubMed, from 1946), EMBASE (via Elsevier, from 1974), Cochrane Library (via Wiley, issue 1, 2017), Literatura Latino-Americana em Ciências da Saúde e do Caribe [Latin America and Caribbean Health Sciences Literature] (LILACS; via Biblioteca Virtual em Saúde [BVS], from 1966), and ADOLEC (via BVS). We also searched for ongoing or unpublished trials in the US National Institutes of Health Ongoing Trials Register (www.clinicaltrials.gov) and the WHO International Clinical Trials Registry Platform (ICTRP; http://apps.who.int/trialsearch/). The search strategies are available as Appendix 1.
Two reviewers (DMM and RR) independently assessed titles and abstracts from all records retrieved by the literature search for eligibility according to the inclusion criteria. Studies selected at this first stage were then evaluated in its full text to confirm eligibility. Disagreements between reviewers were resolved using consensus-based models for decision making. The selection process was performed using the Rayyan platform.18
Data extraction and presentation of findings
The search strategies retrieved 521 records. The PRISMA diagram is shown in Figure 1.
Figure 1 PRISMA flow diagram.
From the 44 studies initially retrieved by the search strategy, 31 were excluded, due to inclusion of participants older than 25 years, without depicting young people separately in the analysis. Of the 13 selected studies, there were six registered clinical trials, and two of which evaluated safety, feasibility, and the acceptability of daily oral TDF/FTC (Truvada®) specifically among adolescents.
The Adolescent Medicine Trials Network [ATN] protocol 113 (NCT01769456)19 recruited participants from six study sites in the USA, and the CHAMPS PillPlus (NCT02213328),20 in two peri-urban settings in South Africa. Other selected trials included participants up to 24 years of age combining behavioral HIV prevention interventions and oral PrEP. The trials and other studies in this review are summarized in Table 2. They also addressed several domains, including feasibility, medical adherence, the acceptability of oral daily TDF or TDF/FTC, patterns of PrEP use, patterns of sexual risk behavior, risk compensation, as well as cognitive and emotional processes in response to using PrEP. The ATN 082 study compared proven behavioral HIV prevention interventions (Many Men, Many Voices [3MV]) alone and in combination with PrEP or placebo.21
There are three selected trials that are still ongoing, with complete results unavailable as of yet. One of which is evaluating the differences in adherence to PrEP with or without the use of short message service (SMS) reminders (NCT02915367).22 The HPTN 082 trial is comparing standard adherence support versus enhanced counseling based on feedback from observed drug levels.23 Besides, qualitative research is availing the factors influencing PrEP initiation and adherence.
The NCT0281024924 has a qualitative design aims to identify and understand African American young men who have sex with men (YMSM)’s cognitive and emotional processes in response to using PrEP to reduce their risk for HIV, as well as to identify what factors influence African American YMSM’s likely use of PrEP.
The systematic review retrieved studies’ referencing values and preferences among populations that might benefit from PrEP, as well as health care providers who may prescribe PrEP. Of the 76 included studies, 71 addressed adult populations. Just five studies focused on adolescent girls and young women.25 The substudy of Crew 450, an ongoing longitudinal cohort study, describes PrEP interests among racially and ethnically diverse YMSM aged 16–20 years, utilizing a PrEP interest scale with a score of the likelihood of using PrEP.26
Fisher et al27 provided empirical data on sexual and gender minority youth (SGMY) self-consent that can assist institutional review boards (IRB) on strategies to increase their research participation. Culp and Caucci28 analyzed laws regarding minor’s ability to consent to medical care and its implications for PrEP. One substudy of ATN 113 examined frameworks implemented by IRBs and research personnel to decide whether a protocol would be accepted or not. In addition, an emphasis was placed on adolescent consent with high-risk minor participants.29
Finally, the study by Mack et al30 describes clinician attitudes toward, and practices around, PrEP use in youth.
Despite the encouraging results of PrEP trials in adults, their relevance to the realities of adolescents and young adults is not directly transferable. Thus, data from studies including youth and adolescents are critical for implementation of PrEP in such a highly vulnerable population.
At the time of this review, there were few PrEP studies among adolescents with available results. One such study, Project PrEPare (ATN protocol 113),19 was the first adolescent PrEP study among YMSM aged 15–17 years. Some findings of ATN 113 were initially presented at the Conference on Retroviruses and Opportunistic Infections (CROI).31
Two interconnected issues are important to highlight in this trial. The first is related to adherence: long-term, high adherence has proved to be essential for PrEP to be successful. Most of the adolescents participating in project PrEPare achieved protective drug levels during monthly visits, but adherence decreased when visits became quarterly. Among MSM aged 18–22 years, TDF in the plasma was detectable in only 20% of participants at week 24.21 In the follow-up study, <34% had drug levels consistent with 4+ pills/week at week 48.31 Such a finding is in contrast to adult trends seen in recent trials where adherence by drug detection was quantified at 51–100%.32
Other important findings relate to stigma as a barrier to effective health interventions. Adherent participants were significantly less likely than non-adherents to report concerns about what people would think when finding they were taking PrEP pills. They anticipated the perception of stigma, as living with HIV meant living with the fear and effects of stigmatization, with consequent social rejection, discrimination, or violence.33 Likewise, previous studies have shown that associating PrEP with sexual risk taking may reduce the motivation of young people to seek PrEP or to maintain PrEP use for fear of stigmatization.34,35 The process of enrolling adolescents in this trial was more time-consuming than in the parallel study group of 18–22 years (ATN protocol 110).36 The adolescents were allowed to provide self-consent to participate. This approach reduced by 50% the number of eligible sites cleared by their IRBs to be part of the study, as related in the qualitative substudy of ATN 113.29
The second trial, CHAMPS PillPlus (NCT02213328), included both male and female HIV-negative adolescents aged 16–19 years.20 Those under the age of 18 years had to obtain parental/guardian consent to participate in the study, but this requirement did not disturb the enrollment. Considering that adherence to daily medication regimens poses a significant challenge for adolescents, this study provided support using SMSs, adherence clubs, trained youth-friendly counselors, and real-time feedback on drug levels. A baseline analysis and early data from this study indicate a reasonable uptake and use of PrEP, based on initial plasma TDF levels. Those findings are encouraging, considering results from iPrEx indicating that PrEP reduced the risk of HIV infection by 92% in participants with detectable drug levels in plasma.9
Both ATN 11319 and CHAMPS20 trials showed a high level of acceptability to PrEP among YMSM, girls, and young women. Although some girls expressed hesitation with regard to PrEP, they appreciated the privacy of a pill and would be willing to take PrEP if it was provided for free in the USA. YMSM with better HIV knowledge and a higher level of education showed more interest and were more likely to take PrEP. Irrespective of prior knowledge, they expressed a desire for more information about this new prophylactic strategy. Prudent information for young PrEP users would include minimum necessary frequency of use and if gender would influence the overall dose to achieve similar levels of protection.38,39 Available data suggest that more consistent dosing is required to achieve sufficient levels of TDF in vaginal tissue when compared to rectal tissues.40 However, as demonstrated in the efficacy clinical trials of PrEP, women who were adherent to a daily PrEP regimen were strongly protected against HIV.10,11,41
Project PrEPare also demonstrated the feasibility of enrolling and retaining a young cohort of YMSM into a PrEP trial despite an intensive visit schedule.21 The data focus on YMSM and the general group of adolescents at risk for HIV infection. Nonetheless, the scientific health literature shows a lack of qualitative information on the attitudes and perceptions toward PrEP acceptability in other subgroups of adolescents such as intravenous drug users, transgender youth, adolescent sex workers, or teenagers in other cultural contexts.
Other ongoing, adolescent-inclusive trials hopefully will deliver more data to the discussion. One such study, HPTN082,23 is focused on acceptance and adherence among adolescents and young women aged 16–25 years.
Haberer et al42 showed that scheduled SMS reminders improved highly active antiretroviral therapy (HAART) in the context of real-time monitoring in an adult population. The trial NCT02915367 is assessing the use of SMS reminders (a behavioral intervention) to improve medication compliance in young people.22 A better comprehension of useful indicators of adherence among adolescents at high risk for HIV infection is needed to ensure the effectiveness of PrEP programs.
Young people are not at uniform risk throughout adolescence, and PrEP does not need to be lifelong. As pointed by Hosek et al,21 “PrEP for young people may be best viewed as a time-limited strategy that can bridge the developmental period between sexual debut and adulthood.” This idea may have a strong impact on acceptability and points out the difference between the use of PrEP and HAART for treatment.
Combining behavioral and biomedical approaches may be critical to successful implementation of PrEP programs among youth populations. One such trial, ATN 082, shows the feasibility of enrolling at-risk youth with behavioral intervention plus biomedical prevention (PrEP) with high acceptability; however, the self-reported pill adherence and corresponding plasma drug concentrations from participants were low. More optimistic findings, however, were the reduction in behavioral disinhibition with decrease in risky sexual behavior over time.21
One of the five studies included in the systematic review by Koechlin et al25 was not retrieved by our search strategy, so it does not appear individualized in Table 2. The adolescent girls showed interest in PrEP as protection from HIV, although a few participants appeared confused about if PrEP would protect them from pregnancy as well.30
One of the major concerns that could undermine PrEP benefits regarding risky sexual behavior is risk compensation, that is, PrEP could reduce condom use and increase the risk for other sexually transmitted infections (STIs).43–46 Rubtsova et al47 found that 20% of young women expected to use condoms less frequently if receiving PrEP. The data of adolescent girls from South Africa corroborate in part with this concern. They found PrEP particularly appealing because it would eliminate concerns about being seen while obtaining condoms from clinics.30 The use of condoms is closely related to exposure to partner violence. Even the fear of violence is linked to women’s reluctance or inability to negotiate condoms or to use contraceptives.6 Indeed, if people were using condoms consistently, the rates of new HIV infections would not remain at 2 million new infections per year.48 On the other hand, there are studies showing no evidence of sexual risk compensation with daily oral PrEP;49 Mugwanya et al50 encourage the assertion that behavior modifications, as a result of PrEP, may not undermine the public health benefits of PrEP.
Regarding risk perception, persons who perceive themselves at high risk for HIV infection have a higher PrEP uptake.51 Adolescents and young people are known to have a lower perception of risk of being infected by HIV and other STIs. In Africa, young women have shown low HIV risk perception.52 The substudy of Crew 450 (YMSM aged 16–20 years) showed that unprotected anal intercourse had inversely proportional relationship with interest in taking PrEP.26
Regarding safety, several trials in the adult population demonstrated a small decrease in renal function and bone mineral density.53–56 However, if we consider that HIV infection would require lifelong antiretroviral therapy, with increased side effect burden, PrEP use might present a favorable risk–benefit ratio. Safety data in PrEP studies among adolescents were not available as of this writing.
Although there is a promising horizon for PrEP use among young people, use in this population may still present with several challenges. One of those challenges is acceptability of PrEP with health care providers: knowledge and confidence to prescribe PrEP remains limited among clinicians.57–59 Mullins et al59 specifically assessed the intention of clinicians to prescribe PrEP to adolescents. It is clear that, although all the participants highlight the role of PrEP as a strategy to diminish the risk of acquiring HIV infection, they are not unanimous in prescribing it for adolescents. Fewer participants reported intention to prescribe PrEP for adolescents, regardless of sexual orientation; many professionals identified a number of barriers for patients and providers, within the health care system and the community.
In high-incidence settings, access to PrEP could save money. With the ability to limit PrEP use to an identifiable risk period, we see increased cost savings as opposed to more expensive lifelong antiretroviral treatment.60
One study evaluated the laws referring to adolescent’s ability to consent to diagnostic tests, treatment and prevention of HIV, and other STIs.28 The possibility of minors taking PrEP without parental consent is unclear in the studies, which may complicate efforts to provide clinical care to this age group. The Centers for Disease Control and Prevention PrEP guidelines recommend that all gaps in knowledge regarding this population are weighed against the potential benefit of providing PrEP for an individual adolescent at substantial risk for HIV infection.61 Clinicians considering providing PrEP to minors should observe the local laws and policies that may apply.25
Catalysts for success and barriers impacting acceptability and implementation of PrEP in adolescents are shown in Figure 2. Several topics will need to be better addressed for PrEP to become more widely available to youth at risk for HIV infection.
Figure 2 Factors that influence acceptability and implementation of PrEP in adolescents.
Note: Arguments in favor and the issues that should be better addressed.
Abbreviation: PrEP, pre-exposure prophylaxis.
We faced difficulties when selecting a few studies for this review, because many of them did not consider particularities of each age group. The available data either did not distinguish specific adolescent years or are a part of several studies that focus on the adolescence period in question, which are still ongoing. Such studies will provide evidence to support sound decision making by health care professionals, aiming to not only protect individuals but also contribute to the control of the HIV pandemic.
Some argue that due to cost and adherence barriers, PrEP will not benefit those most in need and may actually enhance existing HIV-associated disparities.62
The inclusion of PrEP in public programs will require guidance to maximize impact and effectiveness based on region, population group, and individual risk.63 As Aggleton64 has remarked, “PrEP is an HIV prevention strategy that may be useful for some people in some contexts some of the time.” It is clear that the benefits of PrEP will vary across different programs and global regions.
Oral PrEP offers an exciting opportunity for adolescents and young adults to access a new prevention option, respecting their particularities and vulnerabilities. Detailed information about the results of available studies should be adequately disseminated to both the youth population and their health care providers to facilitate effective and safe delivery of PrEP. Adherence to PrEP might be facilitated by technology, including SMS and wireless electronic monitoring, as well as counseling and adherence feedback (by measuring drug concentration when feasible. The focus should not be to use PrEP indefinitely, but rather to align PrEP use with periods of high risk for HIV infection. It is essential to reject stereotypes and sex-negative messaging in guiding decisions affecting PrEP access and uptake, since they may contribute to enhance stigma. Overall, it is evident that substantial more research is needed focusing on adolescents and PrEP.
Each country and program should research and understand the peculiar characteristics of their adolescent target populations – what they think, how they feel, and their perspectives surrounding PrEP and risky sexual behavior. With this information, policy makers and clinicians will be better equipped to serve and implement specific strategies that respond adequately to their health care needs.
The authors report no conflicts of interest in this work.
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