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- [4] Efficacy and safety of 22 weeks of maintenance therapy with Peginterferon alfa-2a (40KD) (PEGASYS™) alone versus Peginterferon alfa-2a (40KD) plus ribavirin(COPEGUS™) in naive patients with chronic hepatitis C and genotype 1 who responded to a 24-week course of Peginterferon alfa-2a (40KD) plus ribavirin:: An open, multicenter, randomized trial. HEPATOLOGY, 2003, 38 (04) : 244A - 245A