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August 4, 2014
The San Francisco AIDS Foundation
reported results of additional, long-term data
of PrEP for HIV. The 72-week, open-label extension
of iPrEx enrolled 1,603 HIV uninfected persons
with an average age of 28 at 11 sites on
four continents. All participants had previously
taken part in randomized, blinded, placebo-controlled
trials of oral PrEP. 76% of OLE
participants chose to receive once-daily oral
PrEP with emtricitabine/tenofovir disoproxil
fumarate (FTC/TDF), while the remainder chose
to participate in the study without receiving
PrEP. No study participant who took PrEP four
or more times per week became HIV-infected.
The study measured participant use of PrEP
in dried blood spots (DBS), a novel and highly
sensitive biomarker of long-term PrEP. Among
those receiving PrEP in the study iPrEx OLE,
HIV incidence was 4.7/100PY if drug was not
detected in DBS, 2.3/100PY if drug concentrations
indicated use of fewer than two tablets
per week, 0.6/100PY for use of two to three
tablets per week and 0/100PY for use of four or
more tablets per week (P<0.0001).
October 28, 2013
Tobira Therapeutics released results from a phase IIb trial of cenicriviroc (CVC) for the treatment of HIV infection. The randomized, placebo-controlled, double-blind, double-dummy, dose-finding, 48-week study enrolled 143 HIV treatment-naïve adults with CCR5-tropic HIV infection (patients with CCR5- tropic virus represent approximately 80% of the treatment-naïve HIV-infected population). At week 48, CVC 100mg or CVC 200mg plus Truvada (emtricitabine/tenofovir disoproxil fumarate) showed similar virologic success rates compared to Sustiva (efavirenz or EFV) plus Truvada (68% and 64% v. 50%, FDA Snapshot Analysis-ITT). CVC was associated with a more favorable safety and tolerability profile compared to EFV, including a lower incidence of Grade 3 or higher adverse events (AEs) (4% for all CVC-treated subjects v. 14% for EFV) and discontinuations due to AEs (1% for all CVC-treated subjects v. 21% for EFV) reported. The FDA supports initiation of phase III studies to evaluate CVC as a component of a nucleos(t)ide-sparing “backbone” of cenicriviroc/lamivudine (CVC/3TC).
July 29, 2013
Inovio Pharmaceuticals has released results from two phase I trials (HVTN 070 and HVTN 080) of Pennvax-B preventative HIV DNA vaccine, HVTN 070 without electroporation and HVTN 080 with electroporation. Both trials were multicenter, randomized clinical trials, with 070 enrolling 120 patients and 080 enrolling 48 patients. Robust T-cell responses were generated in 89% of subjects who received three vaccinations of Pennvax-B, which consists of 1mg of each of three DNA plasmids (encoding for HIV gag, pol and env proteins) along with 1mg of IL-12 DNA plasmid, followed by intramuscular electroporation with Inovio’s CELLECTRA device. Three or four vaccinations with a 2mg dose of each Pennvax-B plasmid plus 1.5mg of IL-12 DNA generated fewer responses when delivered without electroporation. Six months after vaccination, T-cell response rates remained strong and persistent in the subjects who received only three doses delivered by CELLECTRA EP. Of 24 positive CD4 or CD8 Tcell responders following the third in month three, 79% (19/24) showed persistent CD4 or CD8 T-cell responses at month nine.
December 10, 2012
Profectus BioSciences issued results from a phase I trial of its recombinant vesicular stomatitis virus (rVSV)-vectored HIV vaccine. This placebo-controlled, dose-escalation study enrolled 60 patients without HIV. Subjects received 104, 105, 106, 107 and 108 plaque-forming units of the rVSV HIV-1 gag vaccine administered by intramuscular injection. The vaccine was found to be safe at all dose levels, and the 108 PFU dose has been selected for evaluation in a follow-on clinical trial (HVTN 087). Assays conducted by Profectus confirmed that 0% of subjects had pre-existing immunity to VSV, that there was a vaccine “take” in 50/50 (100%) vaccine recipients across all dose levels and that no rVSV entered the blood stream or was shed in saliva or urine. Assays conducted by the HVTN Central Immunology Laboratories demonstrated the 108 PFU dose level induced a gag-specific cell-mediated immune (CMI) response in 62.5% of vaccine recipients. Profectus is waiting for results from its pDNA prime/rVSV boost vaccination strategy before advancing the vaccine to phase II.
November 28, 2012
Gilead Sciences released results from a phase III trial of Stribild (elvitegravir 150mg, cobicistat 150mg, emtricitabine 200mg, tenofovir disoproxil fumarate 300mg) for the treatment of HIV. This randomized, double-blind study, Study 102, enrolled treatment-naïve patients with HIV-1 infection with HIV RNA levels greater than or equal to 5,000 copies/mL. Subjects received either Stribild or Atripla (efavirenz 600mg, emtricitabine 200mg, tenofovir disoproxil fumarate 300mg). Data show Stribild was non-inferior to Atripla after two years of treatment. Results found at 96 weeks of treatment, 84% of Stribild patients (n=293/348) and 82% of Atripla patients (n=287/352) achieved HIV RNA (viral load) <50 copies/mL, based on the FDA snapshot algorithm (95% CI for the difference: -2.9% to +8.3% for Stribild versus Atripla; predefined criterion for non-inferiority was a lower bound of a two sided 95% CI of -12%). The most frequent adverse events were diarrhea, nausea, upper respiratory infection, headache, abnormal dreams, fatigue, depression and insomnia. Based on these data, Gilead Sciences has initiated a phase IIIb study evaluating Stribild compared to ritonavir-boosted atazanavir plus Truvada in more than 500 HIV-positive treatment-naïve females.
July 30, 2012
Gilead Sciences released results from a phase III trial of cobicistat compared to ritonavir for the pharmacoenhancing or “boosting” of HIV therapy. This randomized, double-blind study, Study 114, enrolled 357 HIV-infected treatment-naïve patients. Subjects received a once-daily regimen of atazanavir 300mg and Truvada, plus either cobicistat 150mg or ritonavir 100mg for 192 weeks. Results found that the cobicistat regimen was non-inferior to the ritonavir regimen. At 48 weeks, the study found that 85% of the cobicistat-dosed subjects compared to 87% of the ritonavir-dosed subjects achieved HIV RNA (viral load) levels less than 50 copies/mL, based on the FDA snapshot algorithm. Mean increases in CD4 cell counts were 213 cells/mm3 for cobicistat patients and 219 cells/mm3 for ritonavir patients at 48 weeks (p=0.67). The drug was well tolerated. The most common adverse events were jaundice, ocular icterus, nausea, diarrhea, headache, nasopharyngitis, hyperbilirubinemia and upper respiratory infection. Gilead Sciences has submitted a New Drug Application to the FDA for cobicistat.
July 16, 2012
Shionogi-ViiV Healthcare reported interim results from a phase III trial of ING114467 versus Atripla for the treatment of HIV-1. This double-blind, double-dummy study, SINGLE, enrolled 833 patients. Subjects received dolutegravir 50mg plus abacavir/lamivudine or Atripla (tenofovir/emtricitabine/efavirenz) for 48 weeks. Results showed the dolutegravir-based regimen demonstrated superiority over the Atripla regimen. At 48 weeks, 88% of study participants on the dolutegravir regimen were virologically suppressed (<50 copies/mL) vs. 81% of participants on the single-tablet regimen Atripla (difference and 95% CI; 7.4% [+2.5% to +12.3%]; difference in the primary endpoint was statistically significant, p=0.003). Differences in efficacy were primarily driven by a higher rate of discontinuation (10%) due to adverse events on the Atripla arm (only 2% of subjects in the dolutegravir arm discontinued). The most common drug-related adverse events were in the nervous system System Organ (Atripla) and gastrointestinal system organ class (dolutegravir). Shionogi-ViiV Healthcare is expecting results from two other phase III trials of dolutegravir for the treatment of HIV.
February 16, 2009
Indevus reported positive results from a phase II/IIb trial of PRO2000 for the prevention of HIV. This randomized, placebo-controlled, double blind study, dubbed HPTN 035, enrolled approximately 3,100 HIV-uninfected women across sites in Zimbabwe, Malawi, Zambia, South Africa, and the USA. The four-arm trial compared PRO2000, BufferGel (ReProtect), a placebo gel, and no gel. Women enrolled in the three gel arms were to apply the product vaginally up to one hour before each act of sexual intercourse. They were subsequently followed for 12-30 months. The primary endpoint was efficacy in preventing of HIV transmission. Additional endpoints included the prevention of bacterial vaginosis, herpes virus infection, and other sexually transmitted diseases. Of the 3,100 enrolled subjects, 194 new HIV infections occurred over the course of the trial. Of these, 36 occurred in the PRO 2000 arm, 54 in the BufferGel arm, 51 in the placebo arm, and 53 in the no-gel arm, demonstrating that PRO2000 was at least 30% more effective than any other arm in preventing HIV. PRO2000 did not show protection against any other sexually transmitted infection. The treatment was well tolerated.
March 12, 2007
Tibotec reported positive interim results from a phase IIb trial of TMC278 for the treatment of HIV. This randomized, partially blinded, controlled trial enrolled 368 treatment-naïve subjects who received three once-daily doses of TMC278 (25 mg, 75 mg, and 150 mg) or efavirenz (600 mg) both in combination with Combivir or Truvada. At 48 weeks 81% (25mg), 80% (75mg) and 77% (150mg) of the subjects reached the primary endpoint of confirmed plasma viral load <50 copies/mL. This was also reached by 81% of the subjects in the efavirenz arm. Based on the results, Tibotec plans to use the 75 mg dose for upcoming phase III trial.
November 17, 2003
VaxGen reported negative results from a phase III trial investigating AIDSVAX B/E (rgp 120), a vaccine for the prevention of HIV infection. Results showed the vaccine did not show efficacy for either primary or secondary endpoints. Results showed that 105 subjects who received placebo became infected with HIV compared with 106 subjects who received AIDSVAX B/E. The vaccine appeared to be well tolerated with no serious adverse events reported. The randomized, double-blind, placebo-controlled study enrolled 2,546 intravenous drug users at 17 sites in Bangkok, Thailand. The trial was designed to evaluate the vaccine against the blood-borne transmission of HIV subtype E and one strain of HIV subtype B. Subjects were given a total of seven injections, administered at months 0, 1, 6, 12, 18, 24 and 30.
February 24, 2003
Gilead Sciences reported positive results from a phase III trial comparing Viread (tenofovir disoproxil fumarate), a nucleotide analogue reverse transcriptase inhibitor to stavudine for the treatment of HIV infection. Results showed that subjects who received Viread experienced less lipodystrophy, lower elevations in fasting cholesterol and triglyceride levels, and similar reductions in viral load compared to stavudine. Data revealed that 82% of subjects treated with Viread achieved an HIV RNA reduction of less than 400 copies/ml compared to 78% of subjects treated with stavudine. Study 903 is an ongoing, randomized, double blind trial designed to compare the efficacy and safety of Viread plus lamivudine/efavirenz to stavudine plus lamivudine/efavirenz in 600 antiretroviral-naïve subjects with HIV infection.
Vertex Pharmaceuticals reported positive results from two-phase III trials investigating GW433908 (908), a protease inhibitor for the treatment of HIV/AIDS. In the NEAT trial, results showed that 66% of 166 subjects achieved an undetectable viral load (vRNA) with 908 compared to 51% of 83 subjects who received the alternative treatment nelfinavir. Data showed that 28% of subjects who received nelfinavir were considered virologic failures compared to 14% of subjects with 908. In addition, 55% of subjects in the 908 group achieved a viral load less than 50 copies/ml compared to 41% of subjects in the nelfinavir group. The open-label, randomized, multi-center study called NEAT enrolled 249 HIV-positive subjects. Subjects were treated with either 1400 mg 908 or 1250 mg of nelfinavir twice daily for 48 weeks. Positive preliminary results were also reported from the CONTEXT trial comparing 908 plus Ritonavir to Lopinavir plus Ritonavir in 320 treatment-experienced subjects.
August 26, 2002
Results of a phase II study of Remune in combination with highly active antiretroviral therapy (HAART) showed that five out of seven subjects who completed the full treatment period of 132 weeks were responders with higher CD4+ counts. In this clinical study, subjects taking Remune also showed slower rate of progression to AIDS. The study, which took place in Thailand, involved 40 weeks of treatment with Remune alone, followed by 40 weeks of treatment with Remune plus HAART, followed by another period in which HAART was discontinued for structured treatment interruption (STI) and treatment with Remune occurred every 12 weeks. In a separate patient cohort study of Remune and Remune plus HAART, the 20 study subjects showed no signs of resistance mutation over a 232-week observation period. Remune is being developed by Trinity Medical Group USA.
July 15, 2002
Phase II/III trial results suggest that Serono S.A.'s Serostim (somatropin for injection) reduces adipose tissue maldistribution in subjects with HIV-associated adipose redistribution syndrome (HARS). The double-blind STARS trial included 239 subjects at trial sites located throughout the United States. Subjects were randomized to receive Serostim 4 mg daily, Serostim 4 mg on alternate days or placebo. Results showed that Serostim 4 mg daily (versus placebo) produced a significant decrease in visceral adipose tissue (VAT) from baseline to week 12. Additionally, the trunk to limb fat ratio was significantly reduced in both the Serostim 4 mg daily and alternate day groups compared to placebo.