Gilead Sciences, Inc. (NASDAQ:GILD) announced detailed 48-week results from a Phase 3 study (Study 1878) evaluating the efficacy and safety of switching virologically suppressed HIV-1 infected adult patients from a multi-tablet regimen containing a boosted protease inhibitor (bPI) to a fixed-dose combination of bictegravir (50 mg) (BIC), a novel investigational integrase strand transfer inhibitor (INSTI), and emtricitabine/tenofovir alafenamide (200/25 mg) (FTC/TAF), a dual-NRTI backbone. In the ongoing study, BIC/FTC/TAF was found to be statistically non-inferior to regimens containing bPIs and demonstrated no treatment-emergent resistance at 48 weeks. The data are being presented at IDWeek 2017 in San Diego (Session 228).
These data demonstrate the potential of BIC/FTC/TAF to match the efficacy of a boosted protease inhibitor regimen while also offering a high barrier to resistance and fewer interactions with other drugs, said Eric Daar, MD, Chief of the Division of HIV Medicine at Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center and lead author of Study 1878. The findings, along with data from three other Phase 3 studies in both treatment-experienced and treatment-nave patients, suggest that the investigational regimen of BIC/FTC/TAF may be appropriate for a broad range of people living with HIV.
In Study 1878, a total of 577 virologically suppressed adults with HIV taking regimens of boosted atazanavir (ATV) or darunavir (DRV) + abacavir/lamivudine (ABC/3TC) or FTC/tenofovir disoproxil fumarate (TDF) were randomized 1:1 to continue their bPI regimen or to switch to open-label coformulated BIC/FTC/TAF once daily. At the primary endpoint of Week 48, switching to BIC/FTC/TAF was non-inferior to continuing on a bPI regimen with 1.7 percent of patients in each group having HIV-1 RNA =50 c/mL (difference: 0.0 percent, 95 percent CI: -2.5 percent to 2.5 percent, p=1.00); the proportion of patients with HIV-1 RNA
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