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    GS-9137 is a potent low-nanomolar strand transfer inhibitor of HIV-1 integrase. The antiviral activity, tolerability, pharmacokinetics, and pharmacodynamics of GS-9137 were evaluated in a randomized, double-blind, placebo-controlled monotherapy study in 40 HIV-1- infected patients not receiving antiretroviral therapy with an HIV-1 RNA between 10,000 and 300,000 copies/mL and a CD4 count of 200 cells/microL or greater. GS-9137 or matching placebo was administered with food for 10 days at 5 dosage regimens (200, 400, or 800 mg BID, 800 mg QD, or 50 mg+100 mg ritonavir QD; 6 active, 2 placebo per dose level). The primary end point was the maximum reduction from baseline in log10 HIV-1 RNA. Forty patients were enrolled, with a mean baseline viral load of 4.75 log10 copies/mL and a CD4 count of 442 cells/microL. Each GS-9137 dosing regimen exhibited significant, exposure-dependent (mean reductions, -0.98 to -1.99 log10 copies/mL) antiviral activity compared with placebo (P<0.01). Twice-daily administrations of GS-9137 at doses of 400 or 800 mg or once-daily dosing of 50 mg with ritonavir demonstrated mean reductions from baseline in HIV-1 RNA of 1.91 log10 copies/mL or greater, with all patients exhibiting 1 log10 or greater and 50% having 2 log10 or greater reductions. No patient developed evidence of integrase resistance. GS-9137 showed an adverse event profile similar to placebo, and there were no study drug discontinuations. GS-9137 demonstrated substantial short-term antiviral activity and was well tolerated as monotherapy, thus warranting further study.


    Edwin DeJesus, Daniel Berger, Martin Markowitz, Calvin Cohen, Trevor Hawkins, Peter Ruane, Richard Elion, Charles Farthing, Lijie Zhong, Andrew K Cheng, Damian McColl, Brian P Kearney, 183-0101 Study Team. Antiviral activity, pharmacokinetics, and dose response of the HIV-1 integrase inhibitor GS-9137 (JTK-303) in treatment-naive and treatment-experienced patients. Journal of acquired immune deficiency syndromes (1999). 2006 Sep;43(1):1-5

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    PMID: 16936557

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