Study of Combination Treatment With IMO-2125 and Ribavirin in Naïve Hepatitis C-infected, Genotype 1 Patients

A Phase 1, Multi-center, Randomized, Double-Blind, Placebo-controlled, Dose-escalation Safety Assessment Study of Combination Treatment With IMO-2125 and Ribavirin in Naïve Hepatitis C-infected, Genotype 1 Patients

Phase 1, randomized, double-blind, placebo-controlled, dose-escalation study with 3 dose levels of IMO-2125 in combination with standard weight based ribavirin (investigational treatment arm) or placebo in combination with ribavirin (RBV). Each cohort of 15 patients will be randomized 4:1 to receive the investigational treatment arm (12 patients) or placebo and RBV arm (3 patients).

This is a phase 1, randomized, double-blind, placebo-controlled, dose-escalation study with 3 dose levels of IMO-2125 in combination with standard ribavirin or placebo plus ribavirin. Each cohort will be randomized 4:1 to receive the investigational treatment arm or placebo and ribavirin. Three varying dose levels of IMO-2125 will be included. In both arms, ribavirin will be dosed based on patient weight.

Approximately 50 patients will be enrolled in France and Russia. Patients will provide informed consent prior to any screening procedures being performed. Screening will occur within 21 days prior to randomization. Enrolled patients who qualify and proceed successfully through the screening period will be randomized to receive 4 weeks of either the investigational treatment arm (IMO-2125 and ribavirin) or placebo and ribavirin, with a 4 week follow-up period.

Patients who are randomized to the investigational treatment arm will receive one of 3 dose levels of IMO 2125 SC once weekly; each patient will receive the same dose throughout the 4 weeks of treatment. In addition to IMO-2125 treatment they will also receive daily ribavirin, which will be given based on the patients weight and will be taken twice daily for a total of 4 weeks.

Inclusion Criteria:

• Documented genotype 1
• HCV-positive with documented detectable plasma viral concentration > 10,000 IU/mL

Exclusion Criteria:

• Positive test for HIV or HbsAg
• Inadequate bone marrow, liver, and renal function
• Treatment with any IFN-based or other experimental or antiviral therapies - prior or current
• Other significant medical disease
• Concurrent or planned treatment during the study