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Clinical Trial Summary

This is a study of the safety and efficacy of grazoprevir (MK-5172) in combination with elbasvir (MK-8742) ± ribavirin (RBV). The primary efficacy endpoint will be Sustained Virologic Response 12 weeks after the end of all study therapy (SVR12) in each of the treatment arms.

Clinical Trial Description

Part A is being done treatment-naïve (TN), genotype 1 (GT1), interferon eligible, non-cirrhotic (N-C) participants with chronic hepatitis C (CHC). Participants will be assigned randomly to 1 of 2 treatment arms in which they will receive grazoprevir 100 mg once daily (QD) + elbasvir 20 mg or 50 mg QD and twice daily (BID) RBV, or to a treatment arm in which they will receive grazoprevir 100 mg QD + elbasvir 50 mg QD without RBV. Treatment will last 12 weeks.

In Part B, participants with hepatitis C virus (HCV) GT1 and HCV ribonucleic acid (RNA) levels of ≥10,000 IU/mL will be randomly assigned to a study arm, based on absence or presence of cirrhosis (C), whether they are TN or had poor response to previous antiviral therapy (null responders [NR]), or whether co-infected with human immunodeficiency virus (HIV); these participants will receive open-label grazoprevir (100 mg) in combination with elbasvir (50 mg) ± RBV. Treatment will last 8 to 18 weeks dependent on arm assignment.

In Part C, TN, N-C participants with HCV GT1b and HCV RNA levels of ≥10,000 IU/mL will be randomly assigned to receive open-label grazoprevir (100 mg) in combination with elbasvir (50 mg) ± RBV. Treatment will last 8 weeks.

In Part D, TN N-C participants with HCV GT3 and HCV RNA levels of ≥10,000 IU/mL will be randomly assigned to receive open-label grazoprevir (100 mg) in combination with elbasvir (50 mg) + RBV for 12 or 18 weeks. ;

Study Design

Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Investigator), Primary Purpose: Treatment

Related Conditions & MeSH terms

NCT number NCT01717326
Study type Interventional
Source Merck Sharp & Dohme Corp.
Status Completed
Phase Phase 2
Start date February 2013
Completion date May 2015

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