Safety and efficacy of doravirine as first-line therapy in adults with HIV-1: week 192 results from the open-label extensions of the DRIVE-FORWARD and DRIVE-AHEAD phase 3 trials

BACKGROUND

In two phase 3 trials for first-line therapy in adults with HIV-1, doravirine showed non-inferior efficacy, a favourable safety profile, and a superior lipid profile to darunavir and efavirenz through to 48 and 96 weeks. Here we report 192-week results from both studies.

METHODS

DRIVE-FORWARD and DRIVE-AHEAD are multicentre, double-blind, randomised, active comparator-controlled, phase 3 trials of first-line antiretroviral treatment in adults with HIV-1. Eligible participants (aged ≥18 years) were naive to antiretroviral therapy, had plasma HIV-1 RNA 1000 copies per mL or more at screening, had no known resistance to any of the trial drugs, and had creatinine clearance 50 mL per min or more. DRIVE-FORWARD was conducted at 125 sites in 15 countries and compared doravirine (100 mg) with ritonavir-boosted darunavir (ritonavir [100 mg] and darunavir [800 mg]), each administered orally once daily with two nucleoside or nucleotide reverse transcriptase inhibitors (tenofovir disoproxil fumarate [300 mg] and emtricitabine [200 mg] or abacavir sulfate [600 mg] and lamivudine [300 mg]). DRIVE-AHEAD was conducted at 126 sites in 23 countries and compared doravirine (100 mg), lamivudine (300 mg), and tenofovir disoproxil fumarate (300 mg) with that of efavirenz (600 mg), emtricitabine (200 mg), and tenofovir disoproxil fumarate (300 mg), all administered orally once daily. DRIVE-FORWARD enrolment was between Dec 1, 2014, and June 1, 2020, and DRIVE-AHEAD enrolment was between June 10, 2015, and Aug 10, 2020. After the 96-week double-blind phase, eligible participants could enter an open-label extension and either continue doravirine or switch from comparator to doravirine for an additional 96 weeks. Efficacy (HIV-1 RNA <50 copies per mL) and safety assessments (adverse events and changes in laboratory parameters) were pooled. The DRIVE-FORWARD and DRIVE-AHEAD trials were registered with ClinicalTrials.gov, NCT02275780 and NCT02403674.

FINDINGS

Of 1494 participants treated in the double-blind phase (1261 [84%] male and 233 [16%] female), 550 continued doravirine and 502 switched to doravirine in the extension. Using the FDA snapshot approach, HIV-1 RNA less than 50 copies per mL was maintained in 457 (83%) of 550 participants who continued doravirine and 404 (80%) of 502 participants who switched to doravirine. Protocol-defined virological failure and development of resistance were low, occurring mainly before week 96. Two (<1%) of 550 participants who continued doravirine reported serious drug-related adverse events, and three (1%) who continued doravirine and one (<1%) of 502 who switched to doravirine discontinued due to drug-related adverse events. Participants continuing or switching to doravirine showed generally favourable lipid profiles, little weight gain, and small decreases in estimated glomerular filtration rates, with no discontinuations due to increased creatinine or renal adverse events.

INTERPRETATION

Favourable efficacy and safety profiles for doravirine at week 96 were maintained through to week 192 in participants who continued or switched to doravirine, supporting use of doravirine for long-term first-line HIV-1 treatment and for virologically suppressed adults switching therapy.

FUNDING

Merck Sharp & Dohme, a subsidiary of Merck & Co, Rahway, NJ, USA.

Preference for long-acting injectable for ART and PrEP among people with and without HIV: a cross-sectional study in Argentina

Background

Little is known about the preferences for antiretroviral therapy (ART) administration methods, such as oral daily pills or long-acting injectable (LAI) options, as well as preferences for pre-exposure prophylaxis (PrEP) administration methods among people without HIV in Latin America.

Objectives

This study aimed to assess the preferences for ART administration methods among people with HIV and PrEP methods among those without HIV, as well as to examine the correlations and reasons for these preferences.

Design

We conducted a cross-sectional web-based questionnaire between April and July 2021, using social media accounts of a HIV non-governmental organization. The questionnaire was open to all adults living in Argentina, irrespective of their sexual orientation or gender identity.

Methods

The questionnaire included questions on substance use, depression, chronic treatment, previous experiences with injectable medication, and HIV status. Those with HIV answered questions about ART adherence and their preferences for ART methods, while those without HIV were asked about condom use, awareness of PrEP, and their preferences for PrEP methods.

Results

Out of 1676 respondents, 804 had HIV, and 872 did not. Among those with HIV, 91.5% expressed a high preference for LAI-ART, with significantly higher preferences among participants with higher educational levels, cisgender gay, bisexual, and queer men, younger individuals, and those with prior injectable medication experience. Among those without HIV, 68% preferred LAI-PrEP, and this preference was positively associated with previous positive experiences with injectable medication.

Conclusion

The strong preference for LAI-ART suggests the potential for improved adherence and well-being among people with HIV. Additionally, the preference for LAI-PrEP among those without HIV emphasizes the importance of considering this option for HIV prevention strategies. This study highlights the need to offer diverse methods for ART and prevention to accommodate different preferences and improve health care outcomes in Latin America.

Oral and anal microbiome from HIV-exposed individuals: role of host-associated factors in taxa composition and metabolic pathways

Evidence indicates that the microbiome plays a significant role in HIV immunopathogenesis and associated complications. This study aimed to characterize the oral and anal microbiome of Men who have Sex with Men (MSM) and Transgender Women (TGW), with and without HIV. One hundred and thirty oral and anal DNA-derived samples were obtained from 78 participants and subjected to shotgun metagenomics sequencing for further microbiome analysis. Significant differences in the microbiome composition were found among subjects associated with HIV infection, gender, sex behavior, CD4+ T-cell counts, antiretroviral therapy (ART), and the presence of HPV-associated precancerous anal lesions. Results confirm the occurrence of oncogenic viromes in this high HIV-risk population. The oral microbiome in HIV-associated cases exhibited an enrichment of bacteria associated with periodontal disease pathogenesis. Conversely, anal bacteria showed a significant decrease in HIV-infected subjects (Coprococcus comes, Finegoldia magna, Blautia obeum, Catenibacterium mitsuokai). TGW showed enrichment in species related to sexual transmission, which concurs that most recruited TGW are or have been sex workers. Prevotella bivia and Fusobacterium gonidiaformans were positively associated with anal precancerous lesions among HIV-infected subjects. The enrichment of Holdemanella biformis and C. comes was associated with detectable viral load and ART-untreated patients. Metabolic pathways were distinctly affected by predominant factors linked to sexual behavior or HIV pathogenesis. Gene family analysis identified bacterial gene signatures as potential prognostic and predictive biomarkers for HIV/AIDS-associated malignancies. Conclusions: Identified microbial features at accessible sites are potential biomarkers for predicting precancerous anal lesions and therapeutic targets for HIV immunopathogenesis.

Identifying the needs of older people living with HIV (≥ 50 years old) from multiple centres over the world: a descriptive analysis

BACKGROUND

Older People Living with HIV (OPWH) combine both aging and HIV-infection features, resulting in ageism, stigma, social isolation, and low quality of life. This context brings up new challenges for healthcare professionals, who now must aid patients with a significant comorbidity burden and polypharmacy treatments. OPWH opinion on their health management is hardly ever considered as a variable to study, though it would help to understand their needs on dissimilar settings.

METHODS

We performed a cross-sectional, comparative study including patients living with HIV aged ≥50 years old from multiple centers worldwide and gave them a survey addressing their perception on overall health issues, psychological problems, social activities, geriatric conditions, and opinions on healthcare. Data was analyzed through Chisquared tests sorting by geographical regions, age groups, or both.

RESULTS

We organized 680 participants data by location (Center and South America [CSA], Western Europe [WE], Africa, Eastern Europe and Israel [EEI]) and by age groups (50- 55, 56-65, 66-75, >75). In EEI, HIV serostatus socializing and reaching undetectable viral load were the main problems. CSA participants are the least satisfied regarding their healthcare, and a great part of them are not retired. Africans show the best health perception, have financial problems, and fancy their HIV doctors. WE is the most developed region studied and their participants report the best scores. Moreover, older age groups tend to live alone, have a lower perception of psychological problems, and reduced social life.

CONCLUSIONS

Patients' opinions outline region- and age-specific unmet needs. In EEI, socializing HIV and reaching undetectable viral load were the main concerns. CSA low satisfaction outcomes might reflect high expectations or profound inequities in the region. African participants results mirror a system where general health is hard to achieve, but HIV clinics are much more appealing to them. WE is the most satisfied region about their healthcare. In this context, age-specific information, education and counseling programs (i.e. Patient Reported Outcomes, Patient Centered Care, multidisciplinary teams) are needed to promote physical and mental health among older adults living with HIV/AIDS. This is crucial for improving health-related quality of life and patient's satisfaction.

Retention among transgender women treated with dolutegravir associated with tenofovir/lamivudine or emtricitabine in Argentina: TransViiV study

In Argentina, transgender women (TGW) have a high HIV prevalence (34%). However, this population shows lower levels of adherence, retention in HIV care and viral suppression than cisgender patients. The World Health Organization (WHO) recommends the transition to dolutegravir (DTG)-based regimens to reduce adverse events and improve adherence and retention. The purpose of this study was to determine retention, adherence and viral suppression in naïve TGW starting a DTG-based first-line antiretroviral treatment (ART) and to identify clinical and psychosocial factors associated with retention. We designed a prospective, open-label, single-arm trial among ART-naïve HIV positive TGW (Clinical Trial Number: NCT03033836). Participants were followed at weeks 4, 8, 12, 24, 36 and 48, in a trans-affirmative HIV care service that included peer navigators, between December, 2015 and May, 2019. Retention was defined as the proportion of TGW retained at week 48 and adherence was self-reported. Viral suppression at <50 copies/mL was evaluated using snapshot algorithm and as per protocol analysis. Of 75 TGW screened, 61 were enrolled. At baseline, median age was 28 y/o., HIV-1-RNA (pVL) 46,908 copies/mL and CD4+ T-cell count 383 cells/mm3. At week 48, 77% were retained and 72% had viral suppression (97% per protocol). The regimen was well tolerated and participants reported high adherence (about 95%). Eleven of the fourteen TGW who discontinued or were lost to follow-up had undetectable pVL at their last visit. Older age was associated with better retention. DTG-based treatment delivered by a trans-competent team in a trans-affirmative service was safe and well tolerated by TGW and associated with high retention, high adherence and high viral suppression at 48 weeks among those being retained.

"If I'm at home, I do it at home": Qualitative study on HIV self-testing among transgender women in Argentina

BACKGROUND

Evidence among key populations supports acceptability of HIV self-testing (HIVST) due to its privacy and convenience. However, insufficient research has been done among transgender women (TGW), especially in Latin America. Consequently, the aim of this study was to explore the acceptability, perceptions and recommendations for HIVST implementation among TGW in Buenos Aires.

METHODS

A focus group was conducted in July 2019. Particpants were invited to touch and learn about a displayed HIVST kit. The following main topics were explored: acceptability, reasons for seeking self-testing, preferences for training, distribution, periodicity and recommendations for HIVST implementation.

RESULTS

The sample consisted of 12 TGWs; mean age of 26 years (IQR = 22-28); 66% had history of sex-work. The main motivations for seeking HIVST were convenience, privacy, and usage to reduce stigma and discrimination by health-care providers. Recommendations for HIVST were: distribution from primary health centers and trans-sensitive centers; affordable price; assistance by peer health promoters; and the provision of clear written and video instructions.

CONCLUSIONS

Tailored implementation of HIVST can increase HIV testing rates, early detection, and linkage to HIV-care in this high-prevalence group. This study provided community-driven suggestions to inform and adapt an HIVST feasibility pilot study and future implementation in Argentina.

Two-drug regimens for HIV treatment

Combination therapy with three antiretroviral agents has been integral to successful HIV-1 treatment since 1996. Although the efficacy, adverse effects, and toxicities of contemporary three-drug regimens have improved, even the newest therapies have potential adverse effects. The use of two-drug regimens is one way to reduce lifetime exposure to antiretroviral drugs while maintaining the benefits of viral suppression. Multiple large, randomised trials have shown the virological non-inferiority of certain two-drug regimens versus three-drug comparators, including adverse effect differences that reflect known profiles of the antiretroviral drugs in the respective regimens. Two-drug combinations are now recommended in treatment guidelines and include the first long-acting antiretroviral regimen for the treatment of HIV-1. Recommended two-drug regimens differ in their risks for, and factors associated with, virological failure and emergent resistance. The tolerability, safety, metabolic profiles, and drug interactions of two-drug regimens also vary by the constituent drugs. No current two-drug regimen is recommended for people with chronic hepatitis B virus as none include tenofovir. Two-drug regimens have increased options for individualised care.

Opening the door on entry inhibitors in HIV: Redefining the use of entry inhibitors in heavily treatment experienced and treatment-limited individuals living with HIV

INTRODUCTION

Entry inhibitors are a relatively new class of antiretroviral therapy and are typically indicated in heavily treatment experienced individuals living with HIV. Despite this, there is no formal definition of 'heavily treatment experienced'. Interpretation of this term generally includes acknowledgement of multidrug resistance and reflects the fact that patients in need of further treatment options may have experienced multiple lines of therapy. However, it fails to recognize treatment limiting factors including contraindications, age-associated comorbidities, and difficulty adhering to regimens.

METHODS

This manuscript follows a roundtable discussion and aims to identify the unmet needs of those living with HIV who are in need of further treatment options, to broaden the definition of heavily treatment experienced and to clarify the use of newer agents, with an emphasis on the potential role of entry inhibitors, in this population.

RESULTS/CONCLUSIONS

Within the entry inhibitor class, mechanisms of action differ between agents; resistance to one subclass does not confer resistance to others. Combinations of entry inhibitors should be considered in the same regimen, and if lack of response is seen to one entry inhibitor another can be tried. When selecting an entry inhibitor, physicians should account for patient preferences and needs as well as agent-specific clinical characteristics. Absence of documented multidrug resistance should not exclude an individual from treatment with an entry inhibitor; entry inhibitors are a valuable treatment option for all individuals who are treatment limited or treatment exhausted. We should advocate for additional clinical trials that help define the role of entry inhibitors in people with exhausted/limited ART options other than drug resistance.

Late-onset opportunistic infections while receiving anti-retroviral therapy in Latin America: burden and risk factors

OBJECTIVES

The aim of this study was to describe the incidence, clinical characteristics, and risk factors of late-onset opportunistic infections (LOI) in people who live with HIV (PWLHA) within the Caribbean, Central and South America network for HIV epidemiology.

METHODS

We performed a retrospective cohort study including treatment-naive PWLHA enrolled at seven sites (Argentina, Brazil, Chile, Peru, Mexico, and two sites in Honduras). Follow-up began at 6 months after treatment started. Outcomes were LOI, loss to follow-up, and death. We used a Cox proportional hazards model and a competing risks model to evaluate risk factors.

RESULTS

A total of 10,583 patients were included. Median follow up was at 5.4 years. LOI occurred in 895 (8.4%) patients. Median time to opportunistic infection was 2.1 years. The most common infections were tuberculosis (39%), esophageal candidiasis (10%), and Pneumocystis jirovecii (P. jirovecii) pneumonia (10%). Death occurred in 576 (5.4%) patients, and 3021 (28.5%) patients were lost to follow-up. A protease inhibitor-based regimen (hazard ratio 1.25), AIDS-defining events during the first 6 months of antiretroviral-treatment (hazard ratio 2.12), starting antiretroviral-treatment in earlier years (hazard ratio 1.52 for 2005 vs 2010), and treatment switch (hazard ratio 1.31) were associated with a higher risk of LOI.

CONCLUSION

LOI occurred in nearly one in 10 patients. People with risk factors could benefit from closer follow-up.

A small cluster randomised clinical trial to improve health outcomes among Argentine patients disengaged from HIV care

Background

Patients disengaged from HIV care, e.g., missed medication pick-ups, not attending physician visits, account for ≥70% of new HIV infections. Re-engaging and sustaining engagement is essential to controlling the HIV pandemic. This study tested a physician-delivered evidence-based intervention, Motivational Interviewing (MI), to improve health outcomes, adherence to antiretroviral therapy (ART), HIV virologic suppression, CD4+ count, retention in HIV care, and self-efficacy among patients disengaged from care in Argentina.

Methods

Regional clinics (n = 6) were randomised to condition, MI Intervention or Enhanced Standard of Care (ESOC), and recruited N = 360 patients disengaged from HIV care. ART adherence, HIV RNA viral load, CD4+ count retention, and self-efficacy were assessed at baseline, 6, 12, 18, and 24-months. Indirect effects from condition to main outcomes were examined using patient-provider relationship as a mediator. The study was a cluster-randomised clinical trial entitled Conexiones y Opciones Positivas en la Argentina 2 (COPA2) and was registered at clinicaltrials.gov, NCT02846350.

Findings

Participants were an average age of 39·15 (SD = 10·96), 51% were women; intervention participants were older (p = ·019), and more ESOC participants were women (60% vs. 42%, p = 0·001). Using mixed models, the intervention had no effect on ART adherence over time by condition on HIV RNA viral load, CD4+ count retention, or self-efficacy. However, analysing mediated paths, there was an indirect effect of condition on ART adherence (B = 0·188, p = 0·009), HIV viral load (B = -0·095, P = 0·027), and self-efficacy (B = 0·063, P = 0·001), suggesting the intervention was associated with improved patient-provider relationships, which was in turn associated with increased ART adherence, lower HIV viral load, and higher self-efficacy.

Interpretation

These findings suggest that physician-delivered MI may enhance the patient-provider relationship, self-efficacy, and ART adherence, and reduced HIV viral load in patients disengaged from HIV care. However, these findings are preliminary due to the small number of clusters randomised, and replication is warranted.

Funding

National Institutes of Health.

Week 96 Genotypic and Phenotypic Results of the Fostemsavir Phase 3 BRIGHTE Study in Heavily Treatment-Experienced Adults Living with Multidrug-Resistant HIV-1

In the phase 3 BRIGHTE study in heavily treatment-experienced adults with multidrug-resistant HIV-1, fostemsavir plus optimized background therapy (OBT) resulted in sustained rates of virologic suppression through 96 weeks. HIV-1 RNA <40 copies/mL was achieved in 163/272 (60%) Randomized Cohort (RC) participants (with 1 or 2 remaining approved fully active antiretrovirals) and 37/99 (37%) Non-randomized Cohort (NRC) participants (with 0 fully active antiretrovirals). Here we report genotypic and phenotypic analyses of HIV-1 samples from 63/272 (23%) RC participants and 49/99 (49%) NRC participants who met protocol-defined virologic failure (PDVF) criteria through Week 96. The incidence of PDVF was as expected in this difficult-to-treat patient population and, among RC participants, was comparable regardless of the presence of predefined gp120 amino acid substitutions that potentially influence phenotypic susceptibility to temsavir (S375H/I/M/N/T, M426L, M434I, M475I) or baseline temsavir 50% inhibitory concentration fold change (IC₅₀ FC). The incidence of PDVF was lower among participants with higher overall susceptibility score to newly used antiretrovirals (OSS-new), indicating that OSS-new may be a preferred predictor of virologic outcome in heavily treatment-experienced individuals. Predefined gp120 substitutions, most commonly M426L or S375N, were emergent on treatment in 24/50 (48%) RC and 33/44 (75%) NRC participants with PDVF, with related increases in temsavir IC₅₀ FC. In BRIGHTE, PDVF was not consistently associated with treatment-emergent genotypic or phenotypic changes in susceptibility to temsavir or to antiretrovirals in the initial OBT. Further research will be needed to identify which factors are most likely to contribute to virologic failure in this heavily treatment-experienced population (ClinicalTrials.gov, NCT02362503).

Pre-cART Immune Parameters in People Living With HIV Might Help Predict CD8+ T-Cell Characteristics, Inflammation Levels, and Reservoir Composition After Effective cART

Background

Combined antiretroviral treatment (cART) for HIV infection is highly effective in controlling viral replication. However, it cannot achieve a sterilizing cure. Several strategies have been proposed to achieve a functional cure, some of them based on immune-mediated clearing of persistently infected cells. Here, we aimed at identifying factors related to CD8TC and CD4TC quality before cART initiation that associate with the persistence of CD8TC antiviral response after cART, inflammation levels, and the size of the viral reservoir.

Methods

Samples from 25 persons living with HIV were obtained before and after (15 months) cART initiation. Phenotype and functionality of bulk and HIV-specific T cells were assayed by flow cytometry ex vivo or after expansion in pre-cART or post-cART samples, respectively. Cell-Associated (CA) HIV DNA (total and integrated) and RNA (unspliced [US] and multiple spliced [MS]) were quantitated by real-time PCR on post-cART samples. Post-cART plasma levels of CXCL10 (IP-10), soluble CD14 (sCD14) and soluble CD163 (sCD163) were measured by ELISA.

Results

Pre-cART phenotype of CD8TCs and magnitude and phenotype of HIV-specific response correlated with the phenotype and functionality of CD8TCs post-cART. Moreover, the phenotype of the CD8TCs pre-cART correlated with markers of HIV persistence and inflammation post-cART. Finally, exhaustion and differentiation of CD4TCs pre-cART were associated with the composition of the HIV reservoir post-cART and the level of inflammation.

Conclusions

Overall, this work provides data to help understand and identify parameters that could be used as markers in the development of immune-based functional HIV cure strategies.

Three-year durable efficacy of dolutegravir plus lamivudine in antiretroviral therapy - naive adults with HIV-1 infection

OBJECTIVE

To assess efficacy and safety of dolutegravir (DTG) + lamivudine (3TC) vs. DTG + tenofovir disoproxil fumarate/emtricitabine (TDF/FTC) in treatment-naive adults with HIV-1 in the prespecified 144-week secondary analyses of GEMINI-1 and GEMINI-2.

DESIGN

Identical, multicenter, phase III, randomized, non-inferiority studies (double-blind through 96 weeks).

METHODS

Participants with HIV-1 RNA ≤500 000 copies/ml and no major viral resistance mutations to nucleoside reverse transcriptase inhibitors, nonnucleoside reverse transcriptase inhibitors, or protease inhibitors were randomized 1:1 to once-daily DTG + 3TC or DTG + TDF/FTC.

RESULTS

At week 144, DTG + 3TC (N = 716) was noninferior to DTG + TDF/FTC (N = 717) in proportion of participants achieving HIV-1 RNA <50 copies/ml (Snapshot algorithm) in the pooled analysis (82% vs. 84%, respectively; adjusted treatment difference [95% confidence interval (CI)], -1.8% [-5.8, 2.1]), GEMINI-1 (-3.6% [-9.4, 2.1]), and GEMINI-2 (0.0% [-5.3, 5.3]). Twelve DTG + 3TC participants and nine DTG + TDF/FTC participants met protocol-defined confirmed virologic withdrawal (CVW) criteria; none developed treatment-emergent resistance. One DTG + 3TC participant who did not meet CVW criteria developed M184V at week 132 and R263R/K at week 144, conferring a 1.8-fold change in susceptibility to DTG; non-adherence to therapy was reported. Significantly fewer drug-related adverse events occurred with DTG + 3TC vs. DTG + TDF/FTC (20% vs. 27%; relative risk [95% CI], 0.76 [0.63-0.92]). Renal and bone biomarker changes favored DTG + 3TC.

CONCLUSIONS

Three-year durable efficacy, long-term tolerability, and high barrier to resistance support first-line use of DTG + 3TC for HIV-1 treatment (see Supplemental Digital Content 1, http://links.lww.com/QAD/C297; video abstract).

626. The Efficacy and Safety of Maintenance with Doravirine Plus Two NRTIs after Initial Suppression in Adults with HIV-1 in the DRIVE-FORWARD Clinical Trial: Results from the Study Extension through 192 Weeks

Background

DRIVE-FORWARD is a phase 3 trial with a completed double-blind period comparing doravirine (DOR) 100 mg with ritonavir-boosted darunavir (DRV/r) 800/100 mg, both administered with two nucleos(t)ide reverse transcriptase inhibitors (NRTIs; tenofovir and emtricitabine, or abacavir and lamivudine), and an ongoing open-label extension. At Week (W) 48, DOR demonstrated non-inferior efficacy to DRV/r, with a superior lipid profile. Those results were sustained at W96. Here we present efficacy and safety results through W192.

Methods

Participants who completed the 96-week double-blind phase and met inclusion criteria were eligible to receive open-label DOR plus two NRTIs in a 96-week extension. Efficacy and safety at W192 were assessed in two groups: participants initially randomized to DOR and maintained on DOR (n=259) and those who switched from DRV/r to DOR at W96 (n=233).

Results

HIV-1 RNA &lt; 50 copies/mL were maintained through W192 in 81.1% of participants who continued DOR and 80.7% of those who switched from DRV/r to DOR. The mean increase in CD4 T-cell counts from W96 to W192 was similar for participants maintained on DOR (47 cells/mm3) and those switched from DRV/r (53 cells/mm3). Protocol-defined virologic failure occurred in 3.1% and 5.6% of participants maintained on DOR and switched from DRV/r, respectively, and development of genotypic resistance was low in both groups (Table 1). Discontinuation due to adverse events was also low (Table 1). Fasting LDL-cholesterol, non-HDL-cholesterol, and triglycerides showed minimal increase in participants maintained on DOR and were reduced in those switched from DRV/r to DOR (Table 1). Participants maintained on DOR had minimal weight gain after W96 (median 1 kg), and a small increase overall (median 1.9 kg, Day 1 through W192); participants who switched to DOR had a small increase after W96 (median 1.5 kg), similar to the median weight gain in the base study (DOR 1.8 kg; DRV/r 0.7 kg).

Conclusion

Among participants who continued DOR in the DRIVE-FORWARD open-label extension, virologic suppression and favorable safety were maintained for an additional 96 weeks. Participants who switched from DRV/r to DOR maintained virologic suppression and demonstrated favorable safety for 96 weeks.

Disclosures

Pedro Cahn, MD, PHD, Merck (Advisor or Review Panel member)ViiV Healthcare (Grant/Research Support, Advisor or Review Panel member) Kathleen Squires, MD, Merck (Employee) Sushma Kumar, PhD, Merck (Employee) Hong Wan, PhD, Merck (Employee) Valerie Teal, MS, Merck (Employee) Ernest Asante-Appiah, PhD, Merck (Employee) Peter Sklar, MD, Merck (Employee) Elizabeth A. Martin, DO, MPH, MBA, Merck (Employee) Rima Lahoulou, n/a, Merck (Employee)

Long-term safety and efficacy of rilpivirine in combination with nucleoside/nucleotide reverse transcriptase inhibitors in HIV-1 infected patients: 336-week rollover study of phase 2b and 3 clinical studies

Background

To evaluate the long-term safety and efficacy of rilpivirine (RPV), a non-nucleoside reverse transcriptase inhibitor (NNRTI), in combination with nucleoside/nucleotide reverse transcriptase inhibitors (NRTIs) in human immunodeficiency virus (HIV)–infected patients.

Methods

RPV-treated HIV-infected patients from phase 2b or 3 studies rolled-over into this phase 3, open-label study and received RPV 25 mg once daily (QD) with choice of two NRTIs. Adverse events (AEs), plasma viral load, CD4+ cell count, and antiviral resistance were evaluated.

Results

Of the 482 patients treated, 437 (>90%) patients discontinued study treatment; 371 (77%) had switched to commercially available RPV, 14 (2.9%) discontinued due to AEs, and 6 (1.2%) had virologic failure. In this rollover study, patients were followed up to week 336, although data was limited beyond 288 weeks. Forty-five (9.3%) patients were still undergoing treatment at the time of data cut-off for the current analysis (8 February 2018). The most frequently reported AEs were pregnancy in 7 (1.5%) patients and syphilis in 5 (1.0%) patients. Grade 3–4 AEs were reported in 17 (3.5%) patients, and AEs possibly related to RPV in 23 (4.8%) patients. Over 288 weeks of treatment, 80.1% (95% CI: 74.9%; 84.3%) of patients maintained virologic suppression (HIV-1 RNA <50 copies/mL). The absolute CD4+ cell count increased over time until week 192 and remained constant thereafter.

Conclusions

RPV 25 mg QD in combination with an investigator-selected background regimen of two NRTIs demonstrated sustained long-term virologic suppression. The treatment was well-tolerated with no new safety findings.

Brief Report: Switching to DOR/3TC/TDF Maintains HIV-1 Virologic Suppression Through Week 144 in the DRIVE-SHIFT Trial

BACKGROUND

In the primary analysis of the DRIVE-SHIFT trial, switching to doravirine/lamivudine/tenofovir disoproxil fumarate (DOR/3TC/TDF) maintained suppression of HIV-1 through week 48. Here, we present long-term efficacy and safety outcomes through week 144 of the DRIVE-SHIFT trial.

METHODS

This phase 3, randomized, open-label trial evaluated switching from a stable antiretroviral regimen to once-daily DOR/3TC/TDF in adults with HIV-1 suppressed for ≥6 months and no previous virologic failure. Participants switched at day 1 [immediate switch group (ISG); n = 447] or week 24 [delayed switch group (DSG); n = 209]. Nine ISG participants who completed week 48 but did not enter extension-1 were excluded from week 144 efficacy analyses.

RESULTS

At week 144, HIV-1 RNA <50 copies/mL was maintained in 80.1% of the ISG (351/438) and 83.7% of the DSG (175/209), while 2.7% (12/438) and 4.8% (10/209), respectively, had HIV-1 RNA ≥50 copies/mL (Food and Drug Administration Snapshot approach). Protocol-defined virologic failure after switch occurred in 2.1% of ISG (9/438) and 3.3% of DSG (7/209); no viral resistance to doravirine was detected in 4 participants with samples available. Reductions in fasting lipids were observed at 24 weeks after switch and maintained through week 144. The mean weight change from switch to week 144 was +1.4 kg for ISG and +1.2 kg for DSG. The most common adverse events were nasopharyngitis (16.2%), headache (12.3%), and diarrhea (9.1%). Overall, 4.1% discontinued because of adverse events, and no deaths occurred.

CONCLUSIONS

These results confirm that switching to once-daily DOR/3TC/TDF is a generally well-tolerated option for maintaining viral suppression in adults considering a change in therapy.

REGISTRATION

ClinicalTrials.gov NCT02397096.

RBD-specific polyclonal F(ab´)2 fragments of equine antibodies in patients with moderate to severe COVID-19 disease: A randomized, multicenter, double-blind, placebo-controlled, adaptive phase 2/3 clinical trial

BACKGROUND

passive immunotherapy is a therapeutic alternative for patients with COVID-19. Equine polyclonal antibodies (EpAbs) could represent a source of scalable neutralizing antibodies against SARS-CoV-2.

METHODS

we conducted a double-blind, randomized, placebo-controlled trial to assess efficacy and safety of EpAbs (INM005) in hospitalized adult patients with moderate and severe COVID-19 pneumonia in 19 hospitals of Argentina. Primary endpoint was improvement in at least two categories in WHO ordinal clinical scale at day 28 or hospital discharge (ClinicalTrials.gov number NCT04494984).

FINDINGS

between August 1st and October 26th, 2020, a total of 245 patients were enrolled. Enrolled patients were assigned to receive two blinded doses of INM005 (n = 118) or placebo (n = 123). Median age was 54 years old, 65•1% were male and 61% had moderate disease at baseline. Median time from symptoms onset to study treatment was 6 days (interquartile range 5 to 8). No statistically significant difference was noted between study groups on primary endpoint (risk difference [95% IC]: 5•28% [-3•95; 14•50]; p = 0•15). Rate of improvement in at least two categories was statistically significantly higher for INM005 at days 14 and 21 of follow-up. Time to improvement in two ordinal categories or hospital discharge was 14•2 (± 0•7) days in the INM005 group and 16•3 (± 0•7) days in the placebo group, hazard ratio 1•31 (95% CI 1•0 to 1•74). Subgroup analyses showed a beneficial effect of INM005 over severe patients and in those with negative baseline antibodies. Overall mortality was 6•9% the INM005 group and 11•4% in the placebo group (risk difference [95% IC]: 0•57 [0•24 to 1•37]). Adverse events of special interest were mild or moderate; no anaphylaxis was reported.

INTERPRETATION

Albeit not having reached the primary endpoint, we found clinical improvement of hospitalized patients with SARS-CoV-2 pneumonia, particularly those with severe disease.

Acceptability of dual HIV/syphilis rapid test in community- and home-based testing strategy among transgender women in Buenos Aires, Argentina

BACKGROUND

Little is known of acceptability and feasibility of dual HIV and syphilis rapid tests in community- and home-based provider-initiated strategies among transgender women (TGW), in Latin America. Objectives were (1) to assess the acceptability of this strategy and, (2) to determine the percentage of positive results of HIV and syphilis, analyze the correlates of HIV or syphilis positive results, and measure the rates of effective referral and treatment completion among TGW.

METHODS

A multidisciplinary team tested 89 TGW in Buenos Aires. An acceptability survey was administered after the HIV/syphilis Duo test was used. All confirmed cases were referred for treatment initiation.

RESULTS

We found high levels of acceptability (98.8%) of this strategy among TGW. However, only 60.7% preferred simultaneous HIV and syphilis diagnosis test. Moreover, we found 9% of positive results of HIV, 51.7% of syphilis, and 3.4% of positive results for both infections. Only not being tested before was associated with an HIV positive result, and only low level of education was associated with a positive syphilis result. Among 8 TGW who tested positive for HIV, 37.5% (n = 3) started antiretroviral therapy. Of 46 who tested positive for syphilis, only 73.9% (n = 34) were effectively referred and from 23 who started treatment, only 39.1% completed it.

CONCLUSIONS

Community- and home-based dual HIV and syphilis rapid test is a feasible and highly acceptable approach for this hard-to-reach population. Implementing similar strategies could improve screening uptake and accessibility. However, these results highlight the need to improve strategies for treatment uptake, in order to reduce morbidity and risk of onward transmission.

Once-daily Doravirine for Initial Treatment of Adults Living With Human Immunodeficiency Virus-1: An Integrated Safety Analysis

BACKGROUND

A prespecified integrated safety analysis was conducted for 3 doravirine (DOR) double-blind trials (Phase IIb: P007 [NCT01632345]; Phase III: DRIVE-FORWARD [NCT02275780] and DRIVE-AHEAD [NCT02403674]).

METHODS

DOR (100 mg) arms from these trials were compared with darunavir plus ritonavir (DRV+r) in DRIVE-FORWARD and efavirenz (EFV) in P007 and DRIVE-AHEAD. Background therapies were emtricitabine/tenofovir disoproxil fumarate (FTC/TDF) in P007; abacavir/lamivudine (ABC/3TC) or FTC/TDF in DRIVE-FORWARD; and 3TC/TDF for DOR and FTC/TDF for EFV in DRIVE-AHEAD. The primary endpoint was the proportion of participants discontinuing due to adverse events (AEs) through Week 48.

RESULTS

Discontinuation rates due to AEs were similar for participants on DOR and DRV+r (2.5% vs 3.1%, respectively) and lower for those on DOR than for those on EFV (2.5% vs 6.6%, respectively). Rates of drug-related AEs for DOR, DRV+r, and EFV were 30.9%, 32.1%, and 61.4%, respectively. In an analysis of DOR versus EFV, the treatment difference for discontinuations due to AEs was -3.4%, favoring DOR (95% confidence interval -6.2 to -0.8; P = .012). Fewer participants experienced neuropsychiatric AEs on DOR than on EFV (25.0% vs 55.9%, respectively), and fewer experienced diarrhea on DOR than on DRV+r (12.4% vs 22.5%, respectively). Changes from baseline in most lipid parameters also favored DOR.

CONCLUSIONS

At Week 48, DOR at 100 mg had a favorable safety profile compared with EFV or DRV+r and a favorable tolerability profile compared with EFV.

CLINICAL TRIALS REGISTRATION

NCT01632345; NCT02275780 and NCT02403674.

The effect of protease inhibitor-based dual antiretroviral regimens on CD4/CD8 ratio during the first year of therapy in ART-naïve patients with HIV-infection

OBJECTIVES

To assess the effect of protease inhibitor (PI)-based dual therapy on CD4/CD8 ratio during the first year of therapy in antiretroviral therapy (ART)-naïve patients using data from randomized controlled clinical trials.

METHODS

We pooled data from the GARDEL and ANDES studies, both randomized controlled clinical trials that recruited ART-naïve people living with HIV and randomly assigned them to receive PI-based dual therapy (DT) or triple therapy (TT) aiming to compare viral efficacy. We compared median CD4/CD8 ratios and the proportion of patients with CD4/CD8 ratio > 1 at 48 weeks after ART initiation in both treatment arms using the Mann-Whitney U-test and the χ² test. We performed subgroup analysis for patients > 50 years old, with baseline CD4 counts ≤ 200 cells/μL, viral load > 100 000 HIV RNA copies/mL, and ritonavir-boosted lopinavir-based therapy.

RESULTS

We analysed data from 571 patients: 292 on DT and 279 on TT. No differences were observed in CD4/CD8 ratio (0.632 vs. 0.617, P = 0.729) or in the proportion of patients with CD4/CD8 ratio > 1 (17.9% vs. 19.3%, P = 0.678) 48 weeks after ART initiation. Subgroup analysis showed no further differences.

CONCLUSION

The impact of PI-based DT regimens on the CD4/CD8 ratio during the first year of treatment for ART-naïve patients is similar to that of TT.

Reduction of Gender Identity Stigma and Improvements in Mental Health Among Transgender Women Initiating HIV Treatment in a Trans-Sensitive Clinic in Argentina

Purpose: Stigma toward transgender women (TGW) increases psychosocial vulnerability, leading to poor mental health and affecting access and retention in HIV care. Trans-sensitive health care (TSHC) has the potential to mitigate this adverse impact. This study aimed to describe baseline characteristics in gender identity stigma (GIS), mental health, and substance use among TGW living with HIV initiating antiretroviral treatment and to analyze changes after 6 months in HIV care in a TSHC clinic in Argentina. Methods: Sixty-one TGW living with HIV responded to the following questionnaires at baseline and after 6 months in TSHC: sociodemographic, experiences of GIS (in health care, police, etc.), Center for Epidemiologic Studies Depression Scale (CES-D) (depression), State Trait Anxiety Inventory (STAI) (anxiety), Drug Abuse Screening Test (DAST-10) (drug use), Alcohol Use Disorders Identification Test (AUDIT) (alcohol use), 8-item Personal Wellbeing Index-Adults (PWI-A) (quality of life [QOL]), Personality Inventory for DSM-5-Brief Form (PID-5-BF) (maladaptive personality traits), and Duke Index (social support). Analyses included Pearson correlations to analyze associations between variables; and paired sample t-tests, to explore changes between baseline and 6 months. Results: A significant proportion experienced episodes of GIS the last year in any context. At baseline, 50.8% showed significant depressive symptoms and 65.6% reported any drug use in the last year. At 6 months, participants experienced a significant reduction of GIS, both enacted and internalized, anxiety, drug, and alcohol use, and improvement in QOL. The remaining mental health indicators were not significantly modified. Conclusion: A TSHC service may have a gender-affirmative impact on TGW initiating HIV care that contributes to reduce GIS and substance use and improve mental health. This highlights the importance that HIV care programs for TGW comply with trans-sensitive essential components to enhance retention.

Cumulative Burden of Mental Health Factors and Engagement in HIV Care in Argentina

BACKGROUND

Cumulative burden of multiple mental health conditions may worsen physical health outcomes in vulnerable populations. Accordingly, identifying cumulative burdens of mental health conditions that may affect HIV treatment and care can guide public health strategies to reduce their impact on HIV-related health outcomes. This study examined the relationship between the cumulative burden of mental health conditions and factors associated with engagement in HIV care in Argentina.

METHOD

Data for this study was obtained at baseline from Conexiones y Opciones Positivas en la Argentina 2 (COPA2). Participants (N = 360) were cisgender patients living with HIV who were lost to care, recruited from seven clinics serving people living with HIV in four Argentine urban centers. Cumulative burden of mental health conditions (i.e., depressive symptoms, problematic substance use, unhealthy alcohol use, and psychotic symptoms) was assessed.

RESULTS

Every one-point increase in the number of mental health conditions present was associated with a decrement in patient-provider communication (b = - 0.22, p < .001), self-efficacy (b = - 0.13, p = .012), and motivation for adherence (b = - 0.11, p = .039).

CONCLUSION

This study found cumulative burden of depression, problematic substance use, unhealthy alcohol use, and psychotic symptoms to be negatively associated with factors related to engagement in HIV care. Results highlight the importance of identification and treatment of challenges to mental health, in order to ameliorate their influence on engagement in HIV care.

Women of Reproductive Age Living with HIV in Argentina: Unique Challenges for Reengagement in Care

This study evaluated the reasons for not taking antiretroviral treatment (ART) among women of reproductive age who are disengaged from HIV care (have missed pharmacy pickups and physician visits), with the goal of identifying strategies for reengagement in HIV care. Participants were cisgender women (n = 162), 18 to 49 years of age, and who completed sociodemographic, medical history, reasons why they were not taking ART, mental health, motivation, and self-efficacy assessments. Latent class analysis was used for analysis. Women who reported avoidance-based coping (avoid thinking about HIV) had higher depression (U = 608.5, z = −2.7, P = .007), lower motivation (U = 601, z = −2.8, P = .006), and lower self-efficacy (U = 644.5, z = −2.4, P = .017) than those not using this maladaptive strategy. As women living with HIV experience a disproportionate burden of poor health outcomes, interventions focused on the management of depression may improve HIV outcomes and prevent HIV transmission.

Effect of valaciclovir on CD4 count decline in untreated HIV: an international randomized controlled trial

Objectives

To determine the impact of valaciclovir on HIV disease progression in treatment-naive HIV-positive adults.

Methods

In this fully blind, multicentre, 1:1 randomized placebo-controlled trial, treatment-naive HIV-1-positive adults with CD4 counts 400–900 cells/mm³ and not meeting contemporaneous recommendations for combination ART (cART) were randomized to valaciclovir 500 mg or placebo twice daily, and followed quarterly until having two consecutive CD4 counts ≤350 cells/mm³ or initiating cART for any reason. The primary analysis compared the rate of CD4 count decline by study arm after adjusting for baseline CD4 count and viral load (VL). Secondary analyses compared the rate of CD4 percentage decline, HIV VL, herpes simplex virus (HSV) recurrences and drug-related adverse events. The trial closed after release of the START trial results in August 2015.

Results

We enrolled 198 participants in Canada, Brazil, Argentina and the UK. Median (IQR) age was 35 (30–43) years. Baseline CD4 count was 592 (491–694) cells/mm³ and VL was 4.04 (3.5–4.5) log₁₀ copies/mL. Over 276 person-years of follow-up, CD4 counts declined by 49 cells/mm³/year in the valaciclovir arm versus 58 cells/mm³/year in the placebo arm (P = 0.65). No differences were seen in the rate of change in CD4 percentage (−1.2%/year versus −1.7%/year, P = 0.34). VL was 0.27 log₁₀ copies/mL lower in valaciclovir participants overall (P<0.001). Placebo participants had more HSV recurrences (62 versus 21/100 person-years, P < 0.0001) but similar rates of grade ≥2 drug-related adverse events.

Conclusions

Unlike prior trials using aciclovir, we found that valaciclovir did not slow CD4 count decline in cART-untreated adults, although power was limited due to premature study discontinuation. Valaciclovir modestly lowered HIV VL.

Fostemsavir in Adults with Multidrug-Resistant HIV-1 Infection

BACKGROUND

Among some patients with human immunodeficiency virus type 1 (HIV-1) infection who have undergone multiple antiretroviral therapies and have limited options for treatment, new classes of antiretroviral drugs with novel mechanisms of action are needed. Fostemsavir is the prodrug of temsavir, a first-in-class investigational HIV-1 attachment inhibitor.

METHODS

In this ongoing phase 3 trial in 23 countries, we enrolled patients with multidrug-resistant HIV-1 infection in two cohorts, according to their remaining treatment options. In the first cohort, we assigned (in a 3:1 ratio) patients who had the option of using at least one fully active, approved antiretroviral drug in at least one but no more than two antiretroviral classes to add either fostemsavir (at a dose of 600 mg twice daily) or placebo to their failing regimen for 8 days, followed by open-label fostemsavir plus optimized background therapy (randomized cohort). In the second cohort, patients who had no remaining antiretroviral options were started on open-label fostemsavir plus optimized background therapy on day 1 (nonrandomized cohort). The primary end point was the mean change in the HIV-1 RNA level from day 1 through day 8 in the randomized cohort.

RESULTS

A total of 371 patients were treated, including 272 in the randomized cohort and 99 in the nonrandomized cohort. At day 8, the mean decrease in the HIV-1 RNA level was 0.79 log₁₀ copies per milliliter in the fostemsavir group and 0.17 log₁₀ copies in the placebo group (P<0.001). At week 48, a virologic response (HIV-1 RNA level, <40 copies per milliliter) had occurred in 54% of the patients in the randomized cohort and in 38% of those in the nonrandomized cohort; the mean increase in the CD4+ T-cell count was 139 cells per cubic millimeter and 64 cells per cubic millimeter, respectively. Adverse events led to the discontinuation of fostemsavir in 7% of the patients. In the randomized cohort, glycoprotein 120 (gp120) substitutions were found in 20 of 47 patients (43%) with virologic failure.

CONCLUSIONS

In patients with multidrug-resistant HIV-1 infection with limited therapy options, those who received fostemsavir had a significantly greater decrease in the HIV-1 RNA level than those who received placebo during the first 8 days. Efficacy was sustained through 48 weeks. (Funded by Bristol-Myers Squibb and GSK/ViiV Healthcare; BRIGHTE ClinicalTrials.gov number, NCT02362503.).

Long-Acting Cabotegravir and Rilpivirine for Maintenance of HIV-1 Suppression

BACKGROUND

Simplified regimens for the treatment of human immunodeficiency virus type 1 (HIV-1) infection may increase patient satisfaction and facilitate adherence.

METHODS

In this phase 3, open-label, multicenter, noninferiority trial involving patients who had had plasma HIV-1 RNA levels of less than 50 copies per milliliter for at least 6 months while taking standard oral antiretroviral therapy, we randomly assigned participants (1:1) to either continue their oral therapy or switch to monthly intramuscular injections of long-acting cabotegravir, an HIV-1 integrase strand-transfer inhibitor, and long-acting rilpivirine, a nonnucleoside reverse-transcriptase inhibitor. The primary end point was the percentage of participants with an HIV-1 RNA level of 50 copies per milliliter or higher at week 48, determined with the use of the Food and Drug Administration snapshot algorithm.

RESULTS

Treatment was initiated in 308 participants per group. At week 48, HIV-1 RNA levels of 50 copies per milliliter or higher were found in 5 participants (1.6%) receiving long-acting therapy and in 3 (1.0%) receiving oral therapy (adjusted difference, 0.6 percentage points; 95% confidence interval [CI], -1.2 to 2.5), a result that met the criterion for noninferiority for the primary end point (noninferiority margin, 6 percentage points). An HIV-1 RNA level of less than 50 copies per milliliter at week 48 was found in 92.5% of participants receiving long-acting therapy and in 95.5% of those receiving oral therapy (adjusted difference, -3.0 percentage points; 95% CI, -6.7 to 0.7), a result that met the criterion for noninferiority for this end point (noninferiority margin, -10 percentage points). Virologic failure was confirmed in 3 participants who received long-acting therapy and 4 participants who received oral therapy. Adverse events were more common in the long-acting-therapy group and included injection-site pain, which occurred in 231 recipients (75%) of long-acting therapy and was mild or moderate in most cases; 1% withdrew because of this event. Serious adverse events were reported in no more than 5% of participants in each group.

CONCLUSIONS

Monthly injections of long-acting cabotegravir and rilpivirine were noninferior to standard oral therapy for maintaining HIV-1 suppression. Injection-related adverse events were common but only infrequently led to medication withdrawal. (Funded by ViiV Healthcare and Janssen; ATLAS ClinicalTrials.gov number, NCT02951052.).

Bioinformatic analysis of post-transmission viral readaptation in Argentine patients with acute HIV-1 infection

During the acute phase of HIV-1 infection, a strong readaptation occurs in the viral population. Our objective was to analyze the post-transmission mutations associated with escape to the cytotoxic immune response and its relationship with the progression of the infection. In this study, a total of 17 patients were enrolled during acute/early primary HIV infection and 8 subjects that were the HIV positive partner resulting in 8 transmission pairs. Genotyping of the genetic polymorphisms of HLA class I A and B was performed using PCR-SSOP. Viral RNA extraction was from plasma. 570 single Gag-gene amplifications were obtained by limiting-dilution RT-PCR. Epitope prediction was performed with NetMHC CBS prediction server for the 19 HLA-A and B alleles. Cytotoxic response prediction was performed by using the IEDB Analysis Resource. From our results, we deduce that the transmitted CTL / gag escape frequency in the founder virus was at least double compared to the post-transmission events. Additionally, by means of an algorithm that combines these frequencies, we observed that the founder viruses better adapted to the HLA A / B alleles of the recipient could contribute to a greater progression of the infection. Our results suggest that there is a large adaptation of HIV-1 to the HLA A / B alleles prevalent in our population. However, despite this adaptive advantage, the virus needs to make "readjustments" through new escape and compensatory mutations. Interestingly, according to our results, this readaptation could have a role in the progression of the infection.

Perspectives on the Barrier to Resistance for Dolutegravir + Lamivudine, a Two-Drug Antiretroviral Therapy for HIV-1 Infection

In HIV-1-infected patients, virological failure can occur as a consequence of the mutations that accumulate in the viral genome that allow replication to continue in the presence of antiretrovirals (ARVs). The development of treatment-emergent resistance to an ARV can limit a patient's options for future therapy, prompting the need for ARV regimens that are resilient to the emergence of resistance. The genetic barrier to resistance refers to the number of mutations in an ARV's therapeutic target that are required to confer a clinically meaningful loss of susceptibility to the drug. The emergence of resistance can be affected by pharmacological aspects of the ARV, including its structure, inhibitory quotient, therapeutic index, and pharmacokinetic characteristics. Dolutegravir (DTG) has demonstrated a high barrier to resistance, including when used in a two-drug regimen (2DR) with lamivudine (3TC). In the GEMINI-1 and GEMINI-2 studies, DTG +3TC was noninferior to DTG + emtricitabine/tenofovir disoproxil fumarate in treatment-naive participants, with similar proportions achieving HIV-1 RNA <50 copies/mL through 96 weeks. Furthermore, in the TANGO study, virological suppression was maintained at 48 weeks after switching to DTG +3TC from a tenofovir alafenamide (TAF)-based regimen compared with continuing a TAF-based regimen. Most other 2DRs with successful outcomes compared with three-drug regimens have been based on protease inhibitors (PIs); however, this class is associated with adverse metabolic effects and drug–drug interactions. In this review, we discuss the barrier to resistance in the context of a 2DR in which a boosted PI is replaced with DTG +3TC.

Suicidal Ideation Among Adults Re-engaging in HIV Care in Argentina

Argentina has one of the highest suicide rates in Latin America and the Caribbean. Though people living with HIV are at increased risk for suicidal behavior, little research on suicide risk has been conducted among HIV-positive people in this region. This study examined risk factors for suicidal ideation among HIV-infected adults (N = 360) re-engaging in care in Argentina. Overall, 21% of participants reported suicidal ideation in the past week. In adjusted logistic regression models, younger age, increased depressive symptomatology, and drug abuse were associated with suicidal ideation (p < 0.05); decreased motivation for adherence and fewer months since initiating antiretroviral therapy approached significance (p = 0.07). Suicidal ideation was common in this sample of HIV-positive patients in Argentina. Findings highlight the need for routine risk assessment and interventions integrated into the HIV care continuum, addressing depression, substance use, and suicidal behavior.

Inflammatory biomarker levels over 48 weeks with dual vs triple lopinavir/ritonavir-based therapy: Substudy of a randomized trial

Background

Inflammation has been associated with increased morbidity and mortality in HIV-positive patients. We compared inflammatory biomarkers with dual therapy using lopinavir/ritonavir plus lamivudine (LPV/r+3TC) versus triple therapy using LPV/r plus two nucleoside reverse transcriptase inhibitors (LPV/r+2NRTIs) in treatment-naïve HIV-positive adults.

Methods

This was a substudy among Argentinian participants in the randomized trial GARDEL. We measured hsCRP, IL-6, MCP-1, TNF, D-dimer and sCD14 from plasma collected at baseline, week 24 and week 48. Generalized estimating equations with an identity/logit link were used to model the average impact of dual versus triple therapy on each biomarker over time, controlling for baseline levels. Additional models estimated the average effect of virologic suppression on biomarker levels over time, adjusting for age, sex, and baseline CD4 count.

Results

Of 191 trial participants enrolled in Argentina, 172 had baseline and follow-up measurements and were included. Median (IQR) age was 35.5 (28.5, 45) years and CD4 cell count was 310 (219, 414) cells/mm³. Dual therapy was not associated with significantly different biomarker levels over 48 weeks relative to triple therapy. Virologic suppression was associated with statistically significant decreases in MCP-1, TNF and D-dimer levels and an unexpected increase in sCD14 levels. No change was observed in hsCRP or the proportion of participants with undetectable IL-6 levels.

Conclusions

In addition to having virologic non-inferiority, LPV/r+3TC dual therapy is generally associated with similar inflammatory biomarker levels over 48 weeks compared to LPV/r+2NRTIs triple therapy in treatment-naïve adults. Further study of dual treatment regimens is warranted.

Dolutegravir plus lamivudine versus dolutegravir plus tenofovir disoproxil fumarate and emtricitabine in antiretroviral-naive adults with HIV-1 infection (GEMINI-1 and GEMINI-2): week 48 results from two multicentre, double-blind, randomised, non-inferiority, phase 3 trials

BACKGROUND

Effective two-drug regimens could decrease long-term drug exposure and toxicity with HIV-1 antiretroviral therapy (ART). We therefore aimed to evaluate the efficacy and safety of a two-drug regimen compared with a three-drug regimen for the treatment of HIV-1 infection in ART-naive adults.

METHODS

We conducted two identically designed, multicentre, double-blind, randomised, non-inferiority, phase 3 trials: GEMINI-1 and GEMINI-2. Both studies were done at 192 centres in 21 countries. We included participants (≥18 years) with HIV-1 infection and a screening HIV-1 RNA of 500 000 copies per mL or less, and who were naive to ART. We randomly assigned participants (1:1) to receive a once-daily two-drug regimen of dolutegravir (50 mg) plus lamivudine (300 mg) or a once-daily three-drug regimen of dolutegravir (50 mg) plus tenofovir disoproxil fumarate (300 mg) and emtricitabine (200 mg). Both drug regimens were administered orally. We masked participants and investigators to treatment assignment: dolutegravir was administered as single-entity tablets (similar to its commercial formulation, except with a different film colour), and lamivudine tablets and tenofovir disoproxil fumarate and emtricitabine tablets were over-encapsulated to visually match each other. Primary endpoint was the proportion of participants with HIV-1 RNA of less than 50 copies per mL at week 48 in the intention-to-treat-exposed population, using the Snapshot algorithm and a non-inferiority margin of -10%. Safety analyses were done on the safety population. GEMINI-1 and GEMINI-2 are registered with ClinicalTrials.gov, numbers NCT02831673 and NCT02831764, respectively.

FINDINGS

Between July 18, 2016, and March 31, 2017, 1441 participants across both studies were randomly assigned to receive either the two-drug regimen (n=719) or three-drug regimen (n=722). At week 48 in the GEMINI-1 intention-to-treat-exposed population, 320 (90%) of 356 participants receiving the two-drug regimen and 332 (93%) of 358 receiving the three-drug regimen achieved plasma HIV-1 RNA of less than 50 copies per mL (adjusted treatment difference -2·6%, 95% CI -6·7 to 1·5); in GEMINI-2, 335 (93%) of 360 in the two-drug regimen and 337 (94%) of 359 in the three-drug regimen achieved HIV-1 RNA of less than 50 copies per mL (adjusted treatment difference -0·7%, 95% CI -4·3 to 2·9), showing non-inferiority at a -10% margin in both studies (pooled analysis: 655 [91%] of 716 in the two-drug regimen vs 669 [93%] of 717 in the three-drug regimen; adjusted treatment difference -1·7%, 95% CI -4·4 to 1·1). Numerically, more drug-related adverse events occurred with the three-drug regimen than with the two-drug regimen (169 [24%] of 717 vs 126 [18%] of 716); few participants discontinued because of adverse events (16 [2%] in the three-drug regimen and 15 [2%] in the two-drug regimen). Two deaths were reported in the two-drug regimen group of GEMINI-2, but neither was considered to be related to the study medication.

INTERPRETATION

The non-inferior efficacy and similar tolerability profile of dolutegravir plus lamivudine to a guideline-recommended three-drug regimen at 48 weeks in ART-naive adults supports its use as initial therapy for patients with HIV-1 infection.

FUNDING

ViiV Healthcare.

Novel preventive and therapeutic strategies against HIV infection

Since its first isolation in 1983, over 77 million people became infected with the human immunodeficiency virus (HIV), and only one case has been reported in which the virus was completely removed from the body. A recent second case was reported that remains to be confirmed. Antiretroviral therapy (ART) manages to control blood viral replication and, consequently, to restore -at least partially- the functions of the immune system, with a notable positive impact on the morbidity and mortality associated with the virus. However, given the difficulty in eliminating the virus from the body, treatment should be given for life. This long-term exposure to antiretroviral drugs implies the risk of generating intolerance, toxic effects, gaps in adherence and the potential selection of resistance mutations. Another limitation is the high cost of treating 37 million persons living with HIV, most of whom are living in resource-limited countries and relying on international aid initiatives. Having these challenges in mind, there is general agreement that new approaches for preventing and treating HIV infection are needed to control the epidemic, while vaccine development efforts continue. In this regard, new generation broadly neutralising monoclonal antibodies (bnMAbs) against the HIV viral envelope protein can prevent virus acquisition, reduce viremia, enhance immunity, and induce the killing of infected cells in animal models of HIV infection. Most importantly, some clinical trials have shown that bnMAbs could effectively d ecrease viremia and delay viral rebound in people chronically infected with HIV.

[Retention in care and distance between home and hospital in HIV patients of Buenos Aires City]

Background

Distance from patient's home to the hospital has been proposed as one of the limiting factors for patient's retention in care.

Methods

Retrospective cohort study of HIV+ patients 18 years or older who had their first clinical visit between 2011 and 2013 at a reference center in Buenos Aires, Argentina. Patients were considered to be retained in care if they had>=1 clinical visit, laboratory markers (VL and/or CD4 count) and/or ARVs pick-up during the year after their first clinical visit. Each patient address's latitude-longitude was obtained using Google Maps^® web service. Home-hospital distance and travel time were obtained with Google Maps Distance Matrix API^® service.

Results

Of 1020 patients who started follow-up, 15 died and 158 were transferred to another site. Of the remaining, 816 (96.3%) had identifiable address in their electronic medical record. Median age at the time of the first visit was 33 (IQR 27-41) years, 654 (77.9%) patients were male. Median home-hospital distance was 10.3 (IQR 4.4-34.7) km and median travel time was 58.5 (IQR 35-102.5) minutes. 730 patients (89.5%; CI 87.1-91.5%) remained in follow-up after 1 year of their first visit. We didńt find association between travel time and home-hospital distance with retention in this population.

Conclusions

In our study, distance between home and the care center was not associated with lower retention one year after first visit in adult HIV patients attending a public hospital.

LB2. Switch to Doravirine/Lamivudine/Tenofovir Disoproxil Fumarate (DOR/3TC/TDF) Maintains Virologic Suppression Through 48 Weeks: Results of the DRIVE-SHIFT Trial

Background

Doravirine is a novel, non-nucleoside reverse-transcriptase inhibitor (NNRTI) that has demonstrated efficacy in two Phase 3 trials in treatment-naïve adults with HIV-1.

Methods

This open-label, active-controlled, noninferiority (NI) trial evaluated a once-daily single-tablet regimen of doravirine 100 mg, lamivudine 300 mg, and tenofovir disoproxil fumarate 300 mg (DOR/3TC/TDF) vs. continuation of current therapy in adults with HIV-1 virologically suppressed for ≥6 months on a stable regimen of two NRTIs plus a boosted protease inhibitor (PI), boosted elvitegravir, or NNRTI. Participants with screening HIV-1 RNA <40 copies/mL, no history of virologic failure on any regimen, and no resistance to DOR/3TC/TDF were randomized (2:1) to start DOR/3TC/TDF on Day 1 (immediate switch group, ISG) or after 24 weeks (delayed switch group, DSG). The primary endpoint was the proportion (%) of participants with HIV-1 RNA <50 copies/mL (FDA snapshot approach), with the primary comparison between ISG at Week 48 and DSG at Week 24 and a secondary comparison between the groups at Week 24; the NI margin was -8%. The % of participants with HIV-1 RNA ≥50 copies/mL was also analyzed (FDA snapshot approach; NI margin 4%).

Results

A total of 670 participants (447 ISG, 223 DSG) were treated and included in the analyses; 84.5% were male, 76.4% were white, and mean age was 43.3 years. At Week 24, 93.7% (419/447) of ISG vs. 94.6% (211/223) of DSG had HIV-1 RNA <50 copies/mL (difference −0.9% [−4.7, 3.0]), and 1.8% of each group had HIV-1 RNA ≥50 copies/mL. At Week 48, 90.8% (406/447) of ISG maintained HIV-1 RNA <50 copies/mL (vs. 94.6% of DSG at Week 24; difference −3.8%, 95% CI [−7.9%, 0.3%]), and 1.6% of ISG had HIV-1 RNA ≥50 copies/mL. In the ritonavir-boosted PI stratum, mean changes in fasting LDL-C and non-HDL-C at Week 24 were significantly lower (P < 0.0001) in ISG vs. DSG (table). Rates of any AE and of drug-related AEs at Week 24 were higher in ISG vs. DSG. AEs were mild in most ISG participants (64% of those with any AE; 80% of those with drug-related AEs).

Conclusion

A once-daily single-tablet regimen of DOR/3TC/TDF demonstrated non-inferior efficacy and acceptable safety compared with continuing therapy, and is an option for maintaining viral suppression in patients considering a change in therapy.

Disclosures

P. Kumar, Merck, Pfizer, Janssen,: Grant Investigator and Shareholder, Research grant. GSK, Gilead, Teratechnologies, TaiMed,: Grant Investigator, Scientific Advisor and Shareholder, Consulting fee and Research grant. J. M. Molina, Merck GIlead ViiV Janssen Teva: Ad Board and Speaker’s Bureau, Consulting fee. Gilead Sciences: Grant Investigator, Research support. G. Rizzardini, ViiV, Gilead Science, MSD, Angelini, and Abbvie: Board Member and Speaker’s Bureau, Speaker honorarium. Gliead, ViiV, and MSD: Research Contractor, Research grant. P. Cahn, Abbvie: Grant, Research grant. Merck: Grant, Advisory Board. ViiV Healthcare: Grant, Advisory Board. M. Bickel, Merck & Co., Inc.: Research Contractor, Research grant. Y. Zhou, Merck & Co., Inc.: Employee, Salary. C. Morais, Merck Sharp & Dohme, a subsidiary of Merck & Co., Inc.: Employee and Shareholder, May hold stock/stock options in the company and Salary. S. Kumar, Merck & Co., Inc.: Employee and Shareholder, Salary. P. Sklar, Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc.: Employee and Shareholder, Salary. G. J. Hanna, Merck Sharp & Dohme, a subsidiary of Merck & Co., inc.: Employee and Shareholder, May hold stock/stock options in the company. and Salary. C. Hwang, Merck Sharp & Dohme, a subsidiary of Merck & Co., Inc.: Employee and Shareholder, Salary. W. Greaves, Merck Sharp & Dohme, a subsidiary of Merck & Co., Inc.: Employee, May hold stock/stock options within the company.

543. An Integrated Safety Analysis Comparing Once-Daily Doravirine (DOR) to Darunavir+Ritonavir (DRV+r) and Efavirenz (EFV) in HIV-1-Infected, Antiretroviral Therapy (ART)-Naïve Adults

Background

DOR is a novel NNRTI that has shown noninferior efficacy to DRV+r- and EFV-based regimens in phase 3 trials (DRIVE-FORWARD [NCT02275780] and DRIVE-AHEAD [NCT02403674]). A prespecified integrated analysis of those trials plus a completed phase 2 trial (P007; NCT01632345) was performed to evaluate the overall safety and tolerability of DOR.

Methods

In this integrated analysis, DOR (100 mg QD) arms from P007, DRIVE-FORWARD, and DRIVE-AHEAD were compared with DRV+r in DRIVE-FORWARD and EFV in P007 and DRIVE-AHEAD for treatment of HIV-1 in ART-naïve adults. The NRTI background included FTC/TDF in P007, ABC/3TC or FTC/TDF in DRIVE-FORWARD, and 3TC/TDF for DOR and FTC/TDF for EFV in DRIVE-AHEAD. The primary safety endpoint was the proportion of participants discontinuing due to adverse events (AEs) through Week 48.

Results

A total of 1,710 treated participants were included in the analysis (table). Similar proportions of DOR− and DRV+r-treated participants, and fewer of those treated with DOR than with EFV discontinued due to AEs (2.5% vs. 3.1%, DOR vs. DRV+r; 2.5% vs. 6.6%, DOR vs. EFV). Drug-related AEs (DRAEs) were similar for DOR (30.9%) and DRV+r (32.1%), and higher for EFV (61.4%). The most common DRAEs (≥10% any group, any grade) were dizziness (4.9%, 1.8%, and 30.7%) diarrhea (4.0%, 12.8%, and 5.7%), and abnormal dreams (3.2%, 0.3%, and 10.6%) for DOR, DRV+r, and EFV, respectively. Higher rates of central nervous system (CNS) AEs were reported for DOR when EFV was the comparator, while similar low rates of CNS AEs were reported for DOR when DRV+r was the comparator. In two prespecified analyses combining the DOR 100-mg arms and EFV arms from P007 and DRIVE-AHEAD, 2.8% vs. 6.1% discontinued due to AEs on the DOR- and EFV-treated arms, respectively, for a treatment difference of −3.4% (95% CI: −6.2, −0.8; P = 0.012); 25.0% vs. 55.9% of participants experienced ≥1 neuropsychiatric AE in DOR and EFV arms, respectively.

Conclusion

At Week 48, DOR was generally safe and well tolerated in ART-naïve adults with HIV-1. Statistically significantly lower proportions of DOR- than EFV-treated participants discontinued due to AEs supported by a lower proportion that discontinued due to DRAEs. Those on DOR had fewer CNS AEs compared with those on EFV, and less diarrhea than those on DRV+r.

Disclosures

M. Thompson, Merck & Co., Inc.: Research funding to AIDS Research Consortium of Atlanta; no funds to me personally, Research funding to AIDS Research Consortium of Atlanta; no funds to me personally. Bristol Myers Squibb: Research funding to AIDS Research Consortium of Atlanta; no funds to me personally, Research funding to AIDS Research Consortium of Atlanta; no funds to me personally. CytoDyn, Inc.: Research funding to AIDS Research Consortium of Atlanta; no funds to me personally, Research funding to AIDS Research Consortium of Atlanta; no funds to me personally. Gilead Sciences, Inc.: Research funding to AIDS Research Consortium of Atlanta; no funds to me personally, Research funding to AIDS Research Consortium of Atlanta; no funds to me personally. GlaxoSmithKline: Research funding to AIDS Research Consortium of Atlanta; no funds to me personally, Research funding to AIDS Research Consortium of Atlanta; no funds to me personally. Roche Laboratories: Research Funding, Research funding to AIDS Research Consortium of Atlanta; no funds to me personally and Research grant. TaiMed, Inc.: Research Funding, Research funding to AIDS Research Consortium of Atlanta; no funds to me personally and Research grant. ViiV Healthcare: Research Funding, Research funding to AIDS Research Consortium of Atlanta; no funds to me personally. C. Orkin, AbbVie, Abbott, Boehringer Ingelheim, BMS, Gilead, GSK, Janssen, ViiV: Ad Board, Grant Investigator and Research Contractor, Research grant and Research support. J. M. Molina, Merck GIlead ViiV Janssen Teva: Ad Board and Speaker’s Bureau, Consulting fee. Gilead Sciences: Grant Investigator, Research support. J. Gatell, Gilead Sciences: Grant and Independent Contractor, Consulting fee and Educational grant. Janssen: Grant and Independent Contractor, Consulting fee. ViiV Healthcare: Grant and Independent Contractor, Consulting fee. MSD: Grant and Independent Contractor, Consulting fee. P. Sax, Gilead: Consultant and Grant Investigator, Consulting fee, Grant recipient and Research grant. ViiV Healthcare: Consultant and Grant Investigator, Consulting fee, Grant recipient and Research grant. Merck: Consultant and Grant Investigator, Consulting fee, Grant recipient and Research grant. Janssen: Consultant, Consulting fee. BMS, Gilead, Merck, GSK/ViiV: Grant Investigator, Grant recipient and Research grant. P. Cahn, Abbvie: Grant, Research grant. Merck: Grant, Advisory Board. ViiV Healthcare: Grant, Advisory Board. K. Squires, Merck & Co., Inc.: Ad Board, Ad Board. Gilead Sciences: Grant, Ad Board. VIIV: Ad Board, Ad Board. Bristol Myers Squibb: Ad Board, Ad Board. Janssen: Ad Board, Ad Board. Y. Zhou, Merck & Co., Inc.: Employee, Salary. X. Xu, Merck & Co., Inc.: Employee, Salary. A. Rodgers, Merck & Co., Inc.: Employee and Shareholder, Salary. S. Kumar, Merck & Co., Inc.: Employee and Shareholder, Salary. H. Teppler, Merck & Co., Inc.: Employee and Shareholder, Salary. E. Martin, Merck & Co., Inc.: Employee and Shareholder, Salary. G. Hanna, Merck & Co., Inc.: Employee and Shareholder, Salary. C. Hwang, Merck & Co., Inc.: Employee and Shareholder, Salary.

Preventive and therapeutic features of broadly neutralising monoclonal antibodies against HIV-1

The viral plasticity and the vast diversity of HIV-1 circulating strains necessitates the identification of new approaches to control this global pandemic. New generation broadly neutralising monoclonal antibodies (bnMAbs) against the HIV-1 viral envelope protein (Env) can prevent virus acquisition, reduce viraemia, enhance immunity, and induce the killing of infected cells in animal models of HIV-1 infection. Most importantly, passively administered bnMAbs are effective at decreasing viraemia and delaying viral rebound in people chronically infected with HIV-1. Single antibody treatment is associated with the emergence of viral escape mutants, and virus suppression is not maintained in the long term. However, a combination of bnMAbs and bioengineered multivalent antibodies that target different sites on Env might increase the efficacy of immunotherapy, adding a new relevant tool for clinical use. The aim of this Review is to highlight the potential benefits of this novel prophylactic and therapeutic approach to fight HIV-1.

Physician-delivered motivational interviewing to improve adherence and retention in care among challenging HIV-infected patients in Argentina (COPA2): study protocol for a cluster randomized controlled trial

BACKGROUND

"Challenging" HIV-infected patients, those not retained in treatment, represent a critical focus for positive prevention, as linkage to care, early initiation of antiretroviral therapy, adherence and retention in treatment facilitate viral suppression, thus optimizing health and reducing HIV transmission. Argentina was one of the first Latin American countries to guarantee HIV prevention, diagnosis and comprehensive care services, including antiretroviral medication, which removed cost and access as barriers. Yet, dropout occurs at every stage of the HIV continuum. An estimated 110,000 individuals are HIV-infected in Argentina; of these, 70% have been diagnosed and 54% were linked to care. However, only 36% have achieved viral suppression and 31% of those diagnosed delayed entry to care. To achieve meaningful reductions in HIV infection at the community level, innovative strategies must be developed to re-engage patients. Motivational Interviewing (MI) is a patient-centered approach and has been used by therapists in Central and South America to enhance motivation and commitment in substance use and risk reduction. Our pilot feasibility study utilized culturally tailored MI in physicians to target patients not retained in treatment in public and private clinics in Buenos Aires, Argentina. Results demonstrated that a physician-based MI intervention was feasible and effective in enhanced and sustained patient adherence, viral suppression, and patient-physician communication and attitudes about treatment among these patients at 6 and 9 months post baseline.

METHODS/DESIGN

This clinical trial seeks to extend these findings in public and private clinics in four urban population centers in Argentina, in which clinics (n = 6 clinics, six MDs per clinic site) are randomized to experimental (physician MI Intervention) (n = 3) or control (physician Standard of Care) (n = 3) conditions in a 3:3 ratio. Using a cluster randomized clinical trial design, the study will test the effectiveness of a physician-based MI intervention to improve and sustain retention, adherence, persistence, and viral suppression among "challenging" patients (n = 420) over 24 months.

DISCUSSION

Results are anticipated to have significant public health implications for the implementation of MI to re-engage and retain patients in HIV treatment and care and improve viral suppression through high levels of medication adherence.

TRIAL REGISTRATION

ClinicalTrials.gov, ID: NCT02846350 . Registered on 1 July 2016.

Expert consensus statement on the science of HIV in the context of criminal law

INTRODUCTION

Globally, prosecutions for non-disclosure, exposure or transmission of HIV frequently relate to sexual activity, biting, or spitting. This includes instances in which no harm was intended, HIV transmission did not occur, and HIV transmission was extremely unlikely or not possible. This suggests prosecutions are not always guided by the best available scientific and medical evidence.

DISCUSSION

Twenty scientists from regions across the world developed this Expert Consensus Statement to address the use of HIV science by the criminal justice system. A detailed analysis of the best available scientific and medical research data on HIV transmission, treatment effectiveness and forensic phylogenetic evidence was performed and described so it may be better understood in criminal law contexts. Description of the possibility of HIV transmission was limited to acts most often at issue in criminal cases. The possibility of HIV transmission during a single, specific act was positioned along a continuum of risk, noting that the possibility of HIV transmission varies according to a range of intersecting factors including viral load, condom use, and other risk reduction practices. Current evidence suggests the possibility of HIV transmission during a single episode of sex, biting or spitting ranges from no possibility to low possibility. Further research considered the positive health impact of modern antiretroviral therapies that have improved the life expectancy of most people living with HIV to a point similar to their HIV-negative counterparts, transforming HIV infection into a chronic, manageable health condition. Lastly, consideration of the use of scientific evidence in court found that phylogenetic analysis alone cannot prove beyond reasonable doubt that one person infected another although it can be used to exonerate a defendant.

CONCLUSIONS

The application of up-to-date scientific evidence in criminal cases has the potential to limit unjust prosecutions and convictions. The authors recommend that caution be exercised when considering prosecution, and encourage governments and those working in legal and judicial systems to pay close attention to the significant advances in HIV science that have occurred over the last three decades to ensure current scientific knowledge informs application of the law in cases related to HIV.

Computational comparison of availability in CTL/gag epitopes among patients with acute and chronic HIV-1 infection

BACKGROUND

Recent studies indicate that there is selection bias for transmission of viral polymorphisms associated with higher viral fitness. Furthermore, after transmission and before a specific immune response is mounted in the recipient, the virus undergoes a number of reversions which allow an increase in their replicative capacity. These aspects, and others, affect the viral population characteristic of early acute infection.

METHODS

160 singlegag-gene amplifications were obtained by limiting-dilution RT-PCR from plasma samples of 8 ARV-naïve patients with early acute infection (<30 days, 22 days average) and 8 ARV-naive patients with approximately a year of infection (10 amplicons per patient). Sanger sequencing and NGS SMRT technology (Pacific Biosciences) were implemented to sequence the amplicons. Phylogenetic analysis was performed by using MEGA 6.06. HLA-I (A and B) typing was performed by SSOP-PCR method. The chromatograms were analyzed with Sequencher 4.10. Epitopes and immune-proteosomal cleavages prediction was performed with CBS prediction server for the 30 HLA-A and -B alleles most prevalent in our population with peptide lengths from 8 to 14 mer. Cytotoxic response prediction was performed by using IEDB Analysis Resource.

RESULTS

After implementing epitope prediction analysis, we identified a total number of 325 possible viral epitopes present in two or more acute or chronic patients. 60.3% (n = 196) of them were present only in acute infection (prevalent acute epitopes) while 39.7% (n = 129) were present only in chronic infection (prevalent chronic epitopes). Within p24, the difference was equally dramatic with 59.4% (79/133) being acute epitopes (p < 0.05). This is consistent with progressive viral adaptation to immune response in time and further supported by the fact that cytotoxic responses prediction showed that acute epitopes are more likely to generate immune response than chronic epitopes. Interestingly, only 27.5% of acute epitopes match the population-level consensus sequence of the virus.

CONCLUSIONS

Our results indicate that certain non-consensus viral residues might be transmitted more frequently than consensus-residues when located in immunological relevant positions (epitopes). This observation might be relevant to the rationale behind development of an effective vaccineto reduce viral reservoir and induce functional cure of HIV infection based in prevalent acute epitopes.