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Background: Study 1844 demonstrated the safety and noninferior efficacy of switching to bictegravir/ emtricitabine/tenofovir alafenamide (B/F/TAF) from dolutegravir/abacavir/lamivudine (DTG/ABC/3TC). Here we present resistance, viral blips, and virologic outcomes through the end of the study. Methods: Virologically suppressed adults switched to B/F/TAF or continued DTG/ABC/3TC in a double‐blind (DB) manner through Week (W) 48; then all remaining participants received B/F/TAF in an open‐label (OL) extension. Preexisting HIV‐1 drug resistance was determined by cumulative historical genotypes and retrospective baseline proviral DNA genotyping. Viral blips and outcomes based on last available on‐treatment HIV‐1 RNA were assessed for all participants with ≥1 on‐treatment HIV‐1 RNA measurement. Results: 562 participants had HIV‐1 RNA data in the DB phase (281 B/F/TAF, 281 DTG/ABC/3TC), and 545 participants received B/F/TAF and had post‐switch data in the DB and/or OL phases (B/F/TAF duration median 96 weeks, maximum 168 weeks). Cumulative baseline genotypic data from historical (n=271) and/or proviral DNA (n=499) genotypes were available for 96% (522/545) of B/F/TAF‐treated participants. The average frequency of viral blips was 1% per timepoint with 25 participants (10 B/F/TAF, 15 DTG/ABC/3TC) experiencing ≥1 viral blip through W48 and 9 on B/F/TAF experiencing blips after W48. Viral blips were not associated with any baseline characteristic, preexisting resistance, or virologic failure. Through 168 weeks of B/F/TAF treatment, 98% (535/545) had HIV‐1 RNA <50 copies/mL at last visit, including 99% (159/161) with preexisting resistance. No participant developed drug resistance. Conclusion: Virologic suppression was maintained for ≥2 years of B/F/TAF treatment, including in those with preexisting resistance or viral blips. Long‐term suppression and the absence of treatment‐emergent resistance demonstrate the durable efficacy of B/F/TAF.
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The SINGLE study was a randomized, double-blind, noninferiority study that evaluated the safety and efficacy of 50 mg dolutegravir + abacavir/lamivudine versus efavirenz/tenofovir/emtricitabine in 833 ART-naive HIV-1 + participants. Of 833 randomized participants, 71% in the dolutegravir + abacavir/lamivudine arm and 63% in the efavirenz/tenofovir/emtricitabine arm maintained viral loads of <50 copies per milliliter through W144 (P = 0.01). Superior efficacy was primarily driven by fewer discontinuations due to adverse events in the dolutegravir + abacavir/lamivudine arm [dolutegravir + abacavir/lamivudine arm, 16 (4%); efavirenz/tenofovir/emtricitabine arm, 58 (14%)] through W144 [corrected]. No treatment-emergent integrase or nucleoside resistance was observed in dolutegravir + abacavir/lamivudine recipients through W144.
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Background: Tenofovir has been associated with a decrease in bone mineral density (BMD). However, data on changes in BMD after discontinuing tenofovir are lacking. Methods: We performed a two-centre randomized pilot study in virologically suppressed HIV-infected patients receiving tenofovir with osteopenia/osteoporosis (OsteoTDF study, ClinicalTrials.gov number NCT 01153217). Fifty-four patientswere randomly assigned to switch from tenofovir to abacavir (n = 26) or to continue with tenofovir (n = 28). Changes in lumbar and total hip BMD were evaluated at Week 48 from baseline. Results: Five patients discontinued the study (three from the tenofovir group and two from the abacavir group). No significant differences were detected between the groups at Week 48 (P = 0.229 for total hip and P = 0.312 for lumbar spine). However, hip BMD improved by 2.1% (95% CI -0.6 to 4.7) (P = 0.043) in the abacavir group and 0.7% (95% CI -0.9 to 2.4) (P = 0.372) in the tenofovir group. Lumbar spine BMD varied by -0.7% (95% CI -3.8 to 3.3) (P ≤ 0.001) in the abacavir group and -1.2% (95% CI -3.8 to 0.4) (P < 0.001) in the tenofovir group. Conclusions: Switching from tenofovir to abacavir led to a slight improvement in femoral BMD although no differences were detected between groups. Larger studies are necessary before firm recommendations can be made on the discontinuation of tenofovir in patients with a low BMD. © The Author 2014.
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To assess the safety, tolerance, and efficacy of amprenavir (APV) plus abacavir (ABC) in patients who have previously failed antiretroviral treatment containing a protease inhibitor (PI). To provide open-label, pre-approval access to APV for adults and adolescents with HIV-1 infection and limited treatment options.
This study is being conducted to provide open-label APV to patients in danger of HIV disease progression, as well as those who may benefit beyond the expected outcomes of current anti-retroviral therapies. Despite unapproved status, APV may prove highly efficacious in combatting HIV progression and may help those in need, prior to regulatory approval.
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Enfuvirtide is a novel antiretroviral that blocks HIV-1 cell fusion and viral entry. This Phase II, controlled, open-label, randomized, multicentre dose-ranging trial explored the safety, antiviral activity and pharmacokinetics of enfuvirtide, administered by subcutaneous (s.c.) injection, in 71 HIV-1-infected, protease inhibitor-experienced, non-nucleoside reverse transcriptase inhibitor (NNRTI)-naive adults for 48 weeks. Study participants were randomized to receive enfuvirtide at a deliverable dose of 45, 67.5 or 90 mg twice daily; the 45 mg twice daily dose required 2 injections/day, while the higher doses required 4 injections/day. A background oral antiretroviral (ARV) regimen of abacavir (300 mg twice daily), amprenavir (1200 mg twice daily), ritonavir (200 mg twice daily) and efavirenz (600 mg once daily) was provided with enfuvirtide. A control group received the background ARV regimen alone. All potential participants underwent an HIV genotype at screen to ensure a homogenous population and to exclude patients with evidence of genotypic resistance to NNRTIs. Overall, the tolerability of the combination of abacavir, amprenavir, ritonavir, efavirenz and enfuvirtide was generally comparable to control through 48 weeks. No enfuvirtide dose-dependent adverse events (AEs) were observed across treatment groups. Injection site reactions (ISRs) occurred at least once in 68.5% of the enfuvirtide-treated population, and most ISRs were mild to moderate in severity, with no apparent dose relationship. Excluding ISRs, the most common treatment-emergent AEs were nausea, diarrhoea, dizziness and fatigue; with no clinically significant differences in the incidence of AEs observed between the control and enfuvirtide groups. Each treatment group benefited from ARV therapy, with a trend of increasing antiviral and immunological activity associated with increasing enfuvirtide dose. At 48 weeks, the median HIV-1 RNA change from baseline for the ITT population was -2.24 log10 copies/ml for the combined enfuvirtide groups compared with -1.87 log10 copies/ml for the control group. In addition, 54.9% of patients in the enfuvirtide group achieved HIV-1 RNA < or = 400 copies/ml versus 36.8% of patients in the control group. These results indicate that enfuvirtide has a favourable safety profile and is a promising new antiviral agent for HIV-infected patients who have been on previously failing ARV regimens.
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