Change in metabolic parameters after switching from triple regimens with tenofovir alafenamide to dolutegravir-based dual therapy. Bi-lipid study.

Introduction: The use of tenofovir alafenamide (TAF) has been associated with increased cholesterol and body weight. Real-life data on the metabolic effects of switching from a TAF-based triple regimen to a dolutegravir (DTG)-based two-drug regimen (2-DR) are scarce.

Methods: A retrospective cohort study of patients who have switched from a triple TAF-based regimen to a 2-DR [DTG-lamivudine (DTG-3TC) or DTG- rilpivirine (DTG-RPV]) with at least 6 months of follow-up. The primary endpoint was the absolute change in lipid fractions at 6 months. Secondary outcomes were percentage changes in lipid fraction, effectiveness and safety at 6 and 12 months [intention to treat (ITT), missing = failures].

Results: A total of 118 patients (87 on DTG-3TC, 31 on DTG-RPV) were included. Median age was 51 years (interquartile range: 43-59), 86% were male, CD4 T-cell count was 692 cells/μL, and 98% viral load (VL) < 50 copies/mL. At 6 months there was a decrease in total and low-density lipoprotein cholesterol of 10.7 mg/dL [95% confidence interval (CI): 2.2-19.1; p ≤ 0.001] and 8.3 mg/dL (95% CI: 0.74-15.9; p = 0.026), respectively. There was a reduction in cardiovascular risk from 4.5% at baseline to 4% at 12 months (p = 0.040). Virological effectiveness as determined by ITT analysis was 85.6% at 6 months and 66.1% at 12 months. Seven patients (5.9%) withdrew from the 2-DR and there was no virological failure.

Conclusions: In real life, switching from a triple regimen with TAF to DTG-3TC or DTG-RPV dual therapy improves the lipid profile and is an effective and well-tolerated strategy.