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ViroPharma Announces Positive Data From Phase 1b Combination Study Of HCV-796 And Pegylated Interferon In Hepatitis C Patients
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Press announcement from Viropharma
Article Date: 29 Aug 2006 - 0:00am (PDT)
EXTON, Pa., Aug. 28 /PRNewswire-FirstCall/ -- ViroPharma Incorporated today announced preliminary data from a Phase 1b study of HCV-796, a unique, orally dosed hepatitis C virus (HCV) polymerase inhibitor being co-developed with Wyeth Pharmaceuticals, a division of Wyeth (NYSE: WYE). Preliminary antiviral data are available in the dose range of 100 mg BID to 1,000 mg BID of HCV-796 dosed over a 14-day period in combination with pegylated interferon alfa-2b.
These combination data demonstrate antiviral effects of HCV-796 across multiple genotypes of hepatitis C virus, in treatment-naive adult subjects with chronic hepatitis C infection. Across all dose groups, the combination of HCV-796 and pegylated interferon produced a mean viral reduction of between 3.3 and 3.5 log10 (99.95 percent to 99.97 percent) after 14 days of treatment compared to 1.7 log10 with pegylated interferon alone. During the treatment period, there was no evidence of viral rebound with the combination therapy relative to pegylated interferon alone. No dose-limiting toxicities were seen and although safety data remain blinded, tolerability was consistent with that expected from pegylated interferon.
"These data are clearly very promising as HCV-796 in combination with pegylated interferon appears highly potent with substantial antiviral activity across all doses tested," commented Colin Broom, ViroPharma's chief scientific officer. "To date we have not identified any dose-limiting toxicities with HCV-796 and plan to initiate Phase 2 with the 500 mg BID dose, to be followed by further evaluation of the dose response."
Phase 1b Clinical Trial Description
This 14-day randomized, double-blind, placebo-controlled, sequential-group study of ascending multiple doses enrolled subjects with chronic HCV infection who were naive to treatment. Subjects were enrolled in sequential, ascending dose cohorts with a target of 16 subjects (12 subjects receiving HCV-796 and 4 receiving placebo in each cohort). The first cohorts assessed the effect of HCV-796 as monotherapy compared to placebo (data from which were released on November 10, 2005). Subsequent cohorts were comprised of subjects who received pegylated interferon alfa-2b (PEG-Intron; 1.5 ug/kg/dose) on days -1 and 7 in combination with either placebo or HCV-796 (100 mg, 250 mg, 500 mg or 1000 mg) every 12 hours, from days 1 to 14. Sixty-four percent of patients in the combination therapy cohorts were infected with HCV genotype 1. The mean viral load for each treatment group at study entry was >6.0 log10 IU/ml HCV RNA.
Phase 1b Preliminary Antiviral Data
Preliminary data are available through treatment day 14 from subjects in four combination treatment groups (n= 9-11 subjects per group) and on 15 subjects who received pegylated interferon alone.
-- Across all combination groups, the mean reduction from baseline in plasma HCV RNA ranged from 2.1 to 2.7 log10 on day 7 and 3.3 to 3.5 log10 on day 14. This compared to a reduction of 1.1 log10 on day 7 and 1.7 log10 on day 14 with pegylated interferon alone. Consistent with known effects of pegylated interferon, response varied by HCV genotype:
- For genotype 1, mean reduction from baseline ranged from 1.5 to 2.3 log10 on day 7 and from 2.6 to 3.2 log10 on day 14 in the combination therapy groups compared to 0.9 log10 on day 7 and 1.3 log10 on day 14 for pegylated interferon alone.
-- Viral reduction greater or equal to 2 log10 at day 14 was achieved in 70 to 90 percent of subjects in all combination groups compared to 43 percent on pegylated interferon alone.
-- At day 14, 30 to 33 percent of patients in the combination groups receiving greater than or equal to 250 mg BID of HCV-796 achieved viral levels below the quantification limit of 50 IU/mL HCV RNA.
About ViroPharma Incorporated
ViroPharma Incorporated is committed to the development and commercialization of products that address serious diseases treated by physician specialists and in hospital settings. ViroPharma commercializes Vancocin(R), approved for oral administration for treatment of antibiotic-associated pseudomembranous colitis caused by Clostridium difficile and enterocolitis caused by Staphylococcus aureus, including methicillin-resistant strains (for prescribing information, please download the package insert at http://www.viropharma.com/docs/pulvules_pi.pdf). ViroPharma currently focuses its drug development activities in viral diseases including cytomegalovirus (CMV) and hepatitis C (HCV). For more information on ViroPharma, visit the company's website at http://www.viropharma.com.
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