Safety, Pharmacokinetics, and Pharmacodynamics of Ruzasvir (MK-8408) in Participants With Hepatitis C Infection (MK-8408-003)

Study Overview
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Brief Summary
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This is a 3-part study of Ruzasvir (MK-8408) for participants with hepatitis C infection. Successive participants will be enrolled as dose levels are evaluated to find the maximum safe and well tolerated dose of Ruzasvir. Part I will be for participants with hepatitis C virus (HCV) genotype 3 (GT3) and will run first: Part II will be for participants with HCV genotype 1a (GT1a), and Part III will be for participants with HCV genotype 2b (GT2b). Parts II and III may run concurrently. The primary study hypothesis is that a safe and tolerable dose of Ruzasvir that reduces viral load will be found to support further clinical investigation.

Official Title
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A Multiple Dose Study to Evaluate Safety, Pharmacokinetics, and Pharmacodynamics of MK-8408 in Subjects With Hepatitis C Infection

Conditions
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Hepatitis C Infection

Intervention / Treatment
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* Drug: Ruzasvir


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Body mass index (BMI) >=18 to<=37 kg/m^2 In general good health, except for HCV infection Clinical diagnosis of chronic HCV infection exclusively GT3 (Panels A-D) or exclusively GT1a (Panels E-F), or exclusively GT2b (Panels G-H). Must agree to follow the smoking restrictions defined by the CRU Must agree to use an acceptable method of contraception during the study and for 90 days after the last dose of ruzasvir Exclusion Criteria: Clinically significant endocrine, gastrointestinal, cardiovascular, hematological, hepatic, immunological, renal, respiratory, genitourinary or major neurological abnormalities or diseases History of clinically significant hepatic disease, Gilbert's disease or biliary tract disease History of cancer (malignancy) with the exception of adequately treated non-melanomatous skin carcinoma or carcinoma in situ of the cervix, or successfully-treated malignancies ≥10 years prior to screening History of significant multiple and/or severe allergies or has had an anaphylactic reaction or significant intolerability to prescription or nonprescription drugs or food Positive for hepatitis B or human immunodeficiency virus (HIV) Major surgery or donated or lost 1 unit of blood (approximately 500 mL) within 4 weeks prior to screening Participated in another investigational trial within 4 weeks prior to the screening visit QTc interval >=470 msec (for males) or >= 480 msec (for females) Unable to refrain from or anticipates use of any medication (prescription and/or non-prescription) or herbal remedies beginning approximately 2 weeks prior to first study drug dose, throughout the trial until the post-trial visit Consumes >2 glasses of alcoholic beverages per day Regular user (including recreational use) of any illicit drugs or history of drug (including alcohol) abuse within approximately 12 months Evidence or history of chronic hepatitis not caused by HCV Previous treatment with other HCV NS5A inhibitors such as MK-8742, daclatasvir, or MK-8325 Treatment with other HCV therapies such as the HCV protease Evidence of advanced or decompensated liver disease; evidence of bridging fibrosis or higher grade fibrosis (Metavir score >=3)

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Part I GT3 Participants<br>Participants receive Ruzasvir capsules, orally, starting at a dose of 60 mg once per day (QD) x 5 days with doses increasing or decreasing as clinically indicated. | Drug: Ruzasvir<br>* Ruzasvir capsules, orally, starting at a dose of 60 mg once per day (QD) x 5 days with doses increasing or decreasing as clinically indicated.<br>* Other names: MK-8408;|
| Experimental: Part II GT1a Participants<br>Participants receive Ruzasvir capsules, orally, starting at a dose of 60 mg once per day (QD) x 5 days with doses increasing or decreasing as clinically indicated. | Drug: Ruzasvir<br>* Ruzasvir capsules, orally, starting at a dose of 60 mg once per day (QD) x 5 days with doses increasing or decreasing as clinically indicated.<br>* Other names: MK-8408;|
| Experimental: Part III GT2b Participants<br>Participants receive Ruzasvir capsules, orally, starting at a dose of 60 mg once per day (QD) x 5 days with doses increasing or decreasing as clinically indicated. | Drug: Ruzasvir<br>* Ruzasvir capsules, orally, starting at a dose of 60 mg once per day (QD) x 5 days with doses increasing or decreasing as clinically indicated.<br>* Other names: MK-8408;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Maximum log10 HCV Ribonucleic Acid (RNA) Change From Baseline | Blood was collected at baseline and on Days 1, 2, 3, 4 and 5 to determine HCV RNA levels. Least squares means (LSM) and confidence intervals (CI) were obtained from an analysis of variance (ANOVA) model with maximum log10 HCV RNA change from baseline as response and a fixed effect for treatment. The primary hypothesis was that the mean change from baseline would be a reduction of ≥3 log10. A positive change from baseline indicates a reduction from baseline in log10 HCV RNA. | Baseline and up to Day 5 | 
| Number of Participants Who Experienced One or More Adverse Events (AEs) | An adverse event (AE) is any untoward medical occurrence in a participant administered a pharmaceutical product which does not necessarily have to have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal product or protocol-specified procedure, whether or not considered related to the medicinal product or protocol-specified procedure. Any worsening (i.e., any clinically significant adverse change in frequency and/or intensity) of a preexisting condition that is temporally associated with the use of the Sponsor's product, is also an AE. | Up to 61 days | 
| Number of Participants Who Discontinued Study Drug Due To An AE | An AE is any untoward medical occurrence in a participant administered a pharmaceutical product which does not necessarily have to have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with the use of a medicinal product or protocol-specified procedure, whether or not considered related to the medicinal product or protocol-specified procedure. Any worsening (i.e., any clinically significant adverse change in frequency and/or intensity) of a preexisting condition that is temporally associated with the use of the Sponsor's product, is also an AE. | Up to 5 days |