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  • Title: SCH 503034, a novel hepatitis C virus protease inhibitor, plus pegylated interferon alpha-2b for genotype 1 nonresponders.
    Author: Sarrazin C, Rouzier R, Wagner F, Forestier N, Larrey D, Gupta SK, Hussain M, Shah A, Cutler D, Zhang J, Zeuzem S.
    Journal: Gastroenterology; 2007 Apr; 132(4):1270-8. PubMed ID: 17408662.
    Abstract:
    BACKGROUND & AIMS: SCH 503034 is a novel and potent oral hepatitis C virus (HCV) protease inhibitor. In this phase Ib study, we assessed safety parameters and virologic response of combination of SCH 503034 plus pegylated (PEG) interferon (IFN) alpha-2b in patients with HCV genotype 1 infections who were previously nonresponders to PEG-IFN-alpha-2b +/- ribavirin therapy. METHODS: This was a multicenter, open-label, 2-dose level, 3-way crossover, randomized (to crossover sequence) study carried out in 3 medical centers in Europe. Adult patients received SCH 503034 200 mg (n = 14) or 400 mg (n = 12) 3 times daily orally and PEG-IFN-alpha-2b 1.5 microg/kg subcutaneously once each week. Patients received SCH 503034 as monotherapy for 1 week, PEG-IFN-alpha-2b as monotherapy for 2 weeks, and combination therapy for 2 weeks with washout periods between each treatment period. RESULTS: Combination therapy with SCH 503034 and PEG-IFN-alpha-2b was well tolerated, with no clinically significant changes in safety parameters. Mean maximum log(10) changes in HCV RNA were -2.45 +/- 0.22 and -2.88 +/- 0.22 for PEG-IFN-alpha-2b plus 200 mg and 400 mg SCH 503034, respectively, compared with -1.08 +/- 0.22 and -1.61 +/- 0.21 for SCH 503034 200 mg and 400 mg, respectively, and -1.08 +/- 0.22 and -1.26 +/- 0.20 for PEG-IFN-alpha-2b alone in the 200 mg and 400 mg SCH 503034 groups, respectively. CONCLUSIONS: SCH 503034 plus PEG-IFN-alpha-2b was well tolerated in patients with HCV genotype 1 nonresponders to PEG-IFN-alpha-2b +/- ribavirin. These preliminary results of antiviral activity of the combination suggest a potential new therapeutic option for this hard-to-treat, nonresponder patient population.
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