Observational studyClinical infectious diseases : an official publication of the Infectious Diseases Society of America2024
Tenofovir-Diphosphate and Emtricitabine-Triphosphate Adherence Benchmarks in Dried Blood Spots for Persons With HIV Receiving Tenofovir Alafenamide and Emtricitabine-Based Antiretroviral Therapy (QUANTI-TAF).
Observational study in Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04065347 (Quantification of Tenofovir Alafenamide Adherence and Exposure in Adults Living With HIV), which is not on this map. Cited by 8 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Quantification of Tenofovir Alafenamide Adherence and Exposure in Adults Living With HIV
Who cites it
8 citing papers in PubMed, 7 citations in OpenAlex.
- A Narrative Review of Remote Biospecimen Collection Product and Implementation Considerations for Sexual Health Clinical Research.AIDS and behavior · 2026Review
- In the Mismatch: Viral Suppression Despite Low Tenofovir-Diphosphate in Dried Blood Spots in the Multicenter AIDS Cohort Study/Women's Interagency HIV Study Combined Cohort.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2026Article
- Pharmacokinetics of Twice-daily Tenofovir Alafenamide in Adults With HIV-associated Tuberculosis on Bictegravir/Emtricitabine/Tenofovir Alafenamide and Rifampicin.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2026Article
- Interlaboratory comparison of a dried blood spot assay for antiretroviral adherence: implications for clinical application.The Journal of antimicrobial chemotherapy · 2025Article
- Recommendations for Interpreting Intraerythrocytic Tenofovir Diphosphate and Emtricitabine Triphosphate for HIV-1 Preexposure Prophylaxis Adherence Assessment.Journal of acquired immune deficiency syndromes (1999) · 2025Review
- Novel Micro-LC-MS/MS Method for the Quantification of Tenofovir and Its Active Metabolite Tenofovir-Diphosphate in Biological Matrices for Therapeutic Drug Monitoring.Pharmaceuticals (Basel, Switzerland) · 2025Article
- Cellular pharmacology of tenofovir alafenamide and emtricitabine in neutrophils and platelets in people with and without HIV.The Journal of antimicrobial chemotherapy · 2025Article
- Adherence measurement considerations for oral antiretroviral medications.Journal of the International AIDS Society · 2024Article
Corrections and comments
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Authors and funding
21 authors at 4 institutions in 1 country.
Funding
Abstract
backgroundQUANTI-TAF aimed to establish tenofovir-diphosphate (TFV-DP)/emtricitabine-triphosphate (FTC-TP) adherence benchmarks in dried blood spots (DBS) for persons with human immunodeficiency virus (PWH) receiving tenofovir alafenamide/emtricitabine (TAF/FTC)-based antiretroviral therapy (ART).
methodsFor 16 weeks, PWH received TAF/FTC-based ART co-encapsulated with an ingestible sensor to directly measure cumulative (enrollment to final visit) and 10-day adherence. At monthly visits, intraerythrocytic concentrations of TFV-DP and FTC-TP in DBS were quantified and summarized at steady-state (week 12 or 16) as median (interquartile range). Linear mixed-effects models evaluated factors associated with TFV-DP/FTC-TP.
resultsEighty-four participants (11% female, 4% transgender) predominantly receiving bictegravir/TAF/FTC (73%) were enrolled. Ninety-two percent completed week 12 or 16 (94% unboosted ART). TFV-DP for <85% (7/72), 85%-<95% (9/72), and ≥95% (56/72) cumulative adherence was 2696 (2039-4108), 3117 (2332-3339), and 3344 (2605-4293) fmol/punches. Adjusting for cumulative adherence, TFV-DP was higher with boosted ART, lower body mass index, and in non-Black participants. FTC-TP for <85% (14/77), 85%-<95% (6/77), and ≥95% (57/77) 10-day adherence was 3.52 (2.64-4.48), 4.58 (4.39-5.06), and 4.96 (4.21-6.26) pmol/punches. All participants with ≥85% cumulative and 10-day adherence had TFV-DP ≥1800 fmol/punches and FTC-TP ≥2.5 pmol/punches, respectively. Low-level viremia (HIV-1 RNA 20-199 copies/mL) occurred at 18% of visits in 39% of participants with similar TFV-DP (3177 [2494-4149] fmol/punches) compared with suppressed visits (3279 [2580-4407] fmol/punches).
conclusionsTFV-DP ≥1800 fmol/punches and FTC-TP ≥2.5 pmol/punches represent DBS benchmarks for ≥85% adherence to unboosted TAF/FTC-based ART. Among PWH with high adherence, low-level viremia was common. CLINICAL TRIALS REGISTRATION: NCT04065347.
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