This study was supported by Roche Laboratories, ClinicalTrials.gov Identifier: NCT 00087607
Early virologic response after peginterferon alpha-2a plus ribavirin or peginterferon alpha-2b plus ribavirin treatment in patients with chronic hepatitis C*
Article first published online: 26 APR 2007
Journal of Viral Hepatitis
Volume 14, Issue 10, pages 721–729, October 2007
How to Cite
Di Bisceglie, A. M., Ghalib, R. H., Hamzeh, F. M. and Rustgi, V. K. (2007), Early virologic response after peginterferon alpha-2a plus ribavirin or peginterferon alpha-2b plus ribavirin treatment in patients with chronic hepatitis C. Journal of Viral Hepatitis, 14: 721–729. doi: 10.1111/j.1365-2893.2007.00862.x
- Issue published online: 26 APR 2007
- Article first published online: 26 APR 2007
- Received August 2006; accepted for publication January 2007
- genotype 1;
- hepatitis C virus;
- high viral load;
- peginterferon alpha-2a;
- peginterferon alpha-2b;
- virologic response
Abstract Patients infected with hepatitis C virus (HCV) genotype 1 and with serum HCV RNA concentrations over 800 000 IU/mL have relatively low rates of virologic response to pegylated interferons. The 2 forms of pegylated interferon have different pharmacokinetic profiles, and pilot studies comparing them have yielded varying results. We compared the virologic response to 12 weeks of treatment with peginterferon alpha-2a plus ribavirin vs peginterferon alpha-2b plus ribavirin in 380 patients who were infected with HCV genotype 1 and had high viral loads.
We observed no between-group differences in viral load reduction over time and no differences in the percentage of patients treated with peginterferon alpha-2a or peginterferon alpha-2b plus ribavirin who achieved early virologic response (EVR), defined as ≥2-log reduction in HCV RNA concentration or undetectable HCV RNA at 12 weeks (66%vs 63%). Serum levels of interferon were more frequently below the level of quantitation in patients treated with peginterferon alpha-2b plus ribavirin (58–68%) than in those treated with peginterferon alpha-2a plus ribavirin (1–2%). Patients treated with peginterferon alpha-2b plus ribavirin had higher rates of discontinuation for safety reasons (6%vs 1%).
In conclusion, a substantial percentage of patients infected with HCV genotype 1 and high viral load can achieve EVR when treated with peginterferon and ribavirin. The 2 pegylated interferons showed comparable anti-HCV activity during the first 12 weeks of treatment when combined with the same doses of ribavirin (1000–1200 mg/day), but discontinuations for safety reasons were higher in the patients treated with peginterferon alpha-2b plus ribavirin.