Brief Report: Bictegravir/Emtricitabine/Tenofovir Alafenamide Efficacy in Participants With Preexisting Primary Integrase Inhibitor Resistance Through 48 Weeks of Phase 3 Clinical Trials

Attitudes towards participating in research involving digital pill systems to measure oral HIV pre-exposure chemoprophylaxis: a cross-sectional study among men who have sex with men with substance use in the USA

OBJECTIVES

This quantitative survey sought to understand, among men who have sex with men (MSM) with potentially problematic substance use, the attitudes towards participation in research involving digital pill systems (DPS) for HIV pre-exposure prophylaxis (PrEP) adherence measurement, and the barriers and facilitators to research participation.

DESIGN

One-time, cross-sectional, online sampling-based survey.

SETTING

US social networking app predominantly focused on MSM.

PARTICIPANTS

MSM without HIV who reported current use of oral PrEP, potentially problematic substance use and sexual activity in the past 3 months. A total of 157 participants were eligible, passed validity checks and enrolled.

OUTCOME MEASURES

Perceptions of DPS usefulness, accuracy and usability (System Usability Scale (SUS)); willingness and motivations to participate in DPS research; preferences for access to and feedback on DPS adherence data; data sharing considerations; and medical mistrust (Group-Based Medical Mistrust Scale (GBMMS)).

RESULTS

Most of the sample (N=157) was white (n=119, 75.8%), gay (n=124, 79.0%) and cisgender (n=150, 95.5%). The median age was 33 years (IQR: 14). The mean GBMMS score was 13.5 (SD=5.2), and the median SUS score was 70 (IQR: 27.5). In the past 3 months, 36.3% (n=57) reported frequent use of substances before or during sex, and 62.4% (n=98) engaged in condomless sex. While most were adherent to PrEP, approximately 34.4% (n=54) expressed significant worry about daily adherence. Participants wished to monitor their PrEP adherence daily (n=66, 42.0%) and 52% (n=82) were very willing to participate in DPS-based research. The majority were minimally concerned about sharing DPS-detected adherence data with research teams (n=126, 80.3%), and were extremely willing to share these data with healthcare providers (n=109, 69.4%).

CONCLUSIONS

In this sample, MSM without HIV who use substances reported willingness to use DPS to measure PrEP adherence in a research context, and identified benefits to accessing real-time, DPS-detected adherence data.

Evaluation of treatment simplification strategies in patients living with HIV with multi-drug resistance

Background

Patients living with HIV (PLWH) with multi-drug resistance (MDR) and prior episodes of virologic failure have few therapeutic options remaining. These patients are often prescribed 'salvage' antiretroviral therapy (ART) regimens with high pill burdens, leading to potential decreased medication adherence and increased side effects and drug-drug interactions.

Materials & Methods

In this retrospective, observational cohort study, we included adult patients with a diagnosis of HIV-1 who received care at our institution's Ryan White Clinic and who received 'salvage' ART, defined as three of more antiretroviral agents from at least three different HIV drug classes. Patients were grouped into two cohorts, simplified ART cohort and non-simplified ART cohort, based on whether their ART regimen was reduced by at least one tablet daily. The primary outcome was the percentage of patients who had their viral load suppressed (HIV-1 RNA <50 copies/ml) at their most recent clinic visit. Secondary outcomes were virologic failure (HIV-1 RNA ⩾200 copies/ml), percentage of time patients were virologically suppressed over the past 2 years, and the emergence of new treatment-resistant mutations.

Results

There were 50 patients included in the final analysis, 28 in the simplified ART cohort and 22 in the non-simplified ART cohort. The percentage of patients who had their HIV-1 viral load suppressed at their most recent clinic visit was n = 24 (86%) in the simplified ART cohort and n = 16 (73%) in the non-simplified ART cohort (p = 0.302). There were no statistically significant differences between the two cohorts in terms of the secondary outcomes.

Conclusion

Our study found that simplification of ART regimens based on HIV genotype in PLWH with a history of MDR and prior virologic failures, regardless of the presence of HIV-1 viremia at the time of simplification, resulted in similar rates of virologic suppression and virologic failure as non-simplified ART regimens.

Long-term outcome of lamivudine/dolutegravir dual therapy in HIV-infected, virologically suppressed patients

Background

The use of DTG-containing two-drug regimens is one of the most promising solutions to the need to ease the management of HIV treatment without harming its efficacy and safety. We report long- term results in patients switched, while virologically suppressed, to the combination of dolutegravir (DTG) plus lamivudine (3TC).

Methods

This is a prospective, clinical, uncontrolled cohort enrolling ART-experienced people living with HIV (PLWH) with HIV-RNA < 50 copies/ml for 6 months or longer, negative hepatitis B virus surface antigen, and without known M184V/I mutations. Kaplan-Meiers curves are used to describe persistency of virological suppression on therapy and a Cox regression model to evaluate baseline characteristics and the risk of stopping therapy.

Results

218 individuals switched their regimen since 2015. The mean estimated follow-up was of 64.3 months (95% CI 61.3–67.3) for approximately 1000 patient/years. After 5 years of follow-up, 77.1% were still on the DTG-3TC combination. No virologic failure was detected throughout the whole study period, and only 15 subjects presented single isolated viral blips above 50 copies/ml. Most patients stopped therapy because of reasons unrelated to study drugs (lost to follow-up; patients’ decision; moved to other Centers), but due to the unselected nature of the casuistry; 11 subjects died in the 5 years of follow-up mostly because of pre-existing co-morbidities (6 neoplastic diseases and 2 end-stage liver disease). The median baseline CD4 count was 669 cells/mcl (IQR 483–927). After 5 years it raised to 899 cells/mcl (IQR 646–1160) (P < 0.001) without a significant change of CD8 counts that lowered from 767 cells/mcl (IQR 532–1034) to 683 cells/mcl (IQR 538–988). Consequently, the CD4/CD8 ratio varied from 0.93 (IQR 0.60–1.30) to 1.15 (IQR 0.77–1.45) (P < 0.0001). A non-significant (P = 0.320) increment of mean creatinine, 0.06 mg/dl in magnitude, was observed over the whole follow-up.

Conclusion

These long-term results over 5 years reinforce the durability and good tolerability of DTG-3TC. Our results continue to support the recommended switch use of this 2DR as a well-accepted treatment option for ART-experienced PLWH.