Schering-Plough Provides Update on Boceprevir Clinical Development and Introduces Potent Next-Generation Oral HCV Protease Inhibitor for Treating Patients With Chronic H... (with peginterferon (without ribavirin) d...)

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Schering-Plough Provides Update on Boceprevir Clinical Development and Introduces Potent Next-Generation Oral HCV Protease Inhibitor for Treating Patients With Chronic Hepatitis C

Date:11/24/2008

with peginterferon (without ribavirin), demonstrated enhanced antiviral activity, with up to 4 log10 and 5 log10 decreases in circulating HCV, respectively.

Full results of the boceprevir HCV SPRINT-1 study and early phase clinical results with SCH 900518 are being submitted for presentation at a future medical meeting.

About the Boceprevir HCV SPRINT-1 Study

In this Phase II study, known as HCV SPRINT-1 (HCV Serine Protease Inhibitor Therapy-1), boceprevir (800 mg TID) was evaluated in three treatment regimens: 4 weeks of PEGINTRON (1.5 mcg/kg once weekly) and REBETOL (800-1400 mg daily based on patient weight) therapy followed by the addition of boceprevir to the combination for 24 or 44 weeks (totaling 28 or 48 weeks of treatment), boceprevir in combination with PEGINTRON and REBETOL at the doses described above for 28 or 48 weeks, and, in Part II of the study, boceprevir in combination with PEGINTRON and low-dose REBETOL (400-1000 mg daily based on patient weight) for 48 weeks, compared to a control of PEGINTRON (1.5 mcg/kg once weekly) and REBETOL (800-1400 mg daily based on patient weight) alone for 48 weeks (an approved treatment regimen). The primary endpoint of the study is SVR after 24 weeks of follow up (SVR 24). SVR rates are not yet available for Part II of this study evaluating boceprevir with low-dose REBETOL (n=59) compared to contemporaneous control (n=16) as described above.

About Boceprevir Phase III Studies

Schering-Plough is conducting two large ongoing pivotal Phase III studies of boceprevir in patients chronically infected with HCV genotype 1. One study is in treatment-naive patients and the other in patients who failed prior treatment (relapsers and nonresponders). The two randomized, double-blind, placebo-controlled studies evaluate the efficacy of boceprevir in combination with PEGINTRON and REBETOL compared to standard of care
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