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Taribavirin Phase 2 Dose Finding Study for the Treatment of Hepatitis C Virus (HCV)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
 
ClinicalTrials.gov Identifier: NCT00446134
Recruitment Status : Completed
First Posted : March 12, 2007
Results First Posted : July 27, 2012
Last Update Posted : July 27, 2012
Sponsor:
Information provided by (Responsible Party):
Bausch Health Americas, Inc.

Study Description
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Brief Summary:
The objective of the study is to select an optimal dose of taribavirin by comparing the efficacy and safety of 3 taribavirin dose levels, 20, 25, and 30 mg/kg/day, versus ribavirin 800 to 1400 mg/day based on body weight, both administered in combination with peginterferon alfa-2b to therapy-naive patients with chronic Hepatitis C Virus (HCV) genotype 1 infection.

Condition or disease Intervention/treatment Phase
Chronic Hepatitis C Drug: Taribavirin Drug: Ribavirin Phase 2

Detailed Description:
The objective of the study is to select an optimal dose of taribavirin by comparing the efficacy and safety of 3 taribavirin dose levels, 20, 25, and 30 mg/kg/day, versus ribavirin 800 mg/day to 1400 mg/day based on subject body weight, with both drugs administered in combination with peginterferon alfa-2b to therapy-naive patients with chronic Hepatitis C Virus genotype 1 infection.
Study Design
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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 278 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Phase 2 Comparison of Weight-based Doses of Taribavirin Combined With Peginterferon Alfa-2b Versus Ribavirin Combined With Peginterferon Alfa-2b in Therapy-naïve Patients With Chronic Hepatitis C Virus Genotype 1 Infection
Study Start Date : March 2007
Actual Primary Completion Date : April 2008
Actual Study Completion Date : April 2009

Resource links provided by the National Library of Medicine

Drug Information available for: Ribavirin

Arms and Interventions
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Arm Intervention/treatment
Experimental: Group 1: Drug
Oral taribavirin tablet 20 mg/kg/day (Actual doses were 20-24 mg/kg/day) BID plus weekly subcutaneous injections of peginterferon alfa-2b (1.5 ug/kg/wk)
 Drug: Taribavirin
Oral (200 mg) Tablet: 20mg/kg/day BID, patients will be treated for a total of 48 weeks. in addition, all patients will receive peginterferon alfa-2b (PEG-Intron) by weekly subcutaneous injection. Patients who complete treatment with study drug or discontinue treatment prematurely will enter a 24-week follow-up period.
Other Names:
  • Viramidine
  • RNA003142-204
Experimental: Group 2: Drug
Oral taribavirin tablet 25 mg/kg/day (Actual doses were 25-29 mg/kg/day) BID plus weekly subcutaneous injections of peginterferon alfa-2b (1.5 ug/kg/wk)
 Drug: Taribavirin
Oral (200 mg) Tablet: 25mg/kg/day BID, patients will be treated for a total of 48 weeks. in addition, all patients will receive peginterferon alfa-2b (PEG-Intron) by weekly subcutaneous injection. Patients who complete treatment with study drug or discontinue treatment prematurely will enter a 24-week follow-up period.
Other Names:
  • Viramidine
  • RNA003142-204
Experimental: Group 3: Drug
Oral taribavirin 30 mg/kg/day (Actual doses were 30-34 mg/kg/day) BID plus weekly subcutaneous injections of peginterferon alfa-2b (1.5 ug/kg/wk)
 Drug: Taribavirin
Oral (200mg)Tablet: 30mg/kg/day BID, patients will be treated for a total of 48 weeks. in addition, all patients will receive peginterferon alfa-2b (PEG-Intron) by weekly subcutaneous injection. Patients who complete treatment with study drug or discontinue treatment prematurely will enter a 24-week follow-up period.
Other Names:
  • Viramidine
  • RNA003142-204
Active Comparator: Group 4: Drug
Oral ribavirin 800 mg/day (body weight <65 kg), 1000 mg/day (body weight 65-84 kg), 1200 mg/day (body weight 85-104 kg) or 1400 mg/day (body weight greater than or equal to 105 kg) BID plus weekly subcutaneous injections of peginterferon alfa-2b (1.5 ug/kg/wk)
 Drug: Ribavirin
Oral (200mg)Tablet: 800 mg/day, 1000 mg/day, 1200 mg/day, or 1400 mg/day BID, patients will be treated for a total of 48 weeks. in addition, all patients will receive peginterferon alfa-2b (PEG-Intron) by weekly subcutaneous injection. Patients who complete treatment with study drug or discontinue treatment prematurely will enter a 24-week follow-up period.
Other Names:
  • Rebetol
  • Copegus
  • Ribasphere
  • Virazole


Outcome Measures
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Primary Outcome Measures :
  1. Patients With Either Undetectable Serum HCV RNA (<100 Copies/ml) or at Least a 2-log Decrease From Baseline in Serum Hepatitis C Virus (HCV) Ribonucleic Acid (RNA) at Treatment Week 12. [ Time Frame: Treatment Week 12 ]
    The primary efficacy endpoint was the numbers of responders at Treatment Week (TW) 12. Responders are defined as patients achieving either viral negativity or a partial response (PR). Viral negativity is defined as <100 copies/mL serum HCV RNA. A PR is defined as < 100 copies/mL serum HCV RNA and at least a 2-log decrease from baseline in serum HCV RNA levels. Responder rates with corresponding 95% confidence intervals were estimated for each treatment group.


Secondary Outcome Measures :
  1. Patients With Anemia (Hemoglobin <10 g/dL) Up to Follow-up Week 24 [ Time Frame: Treatment Week Follow-Up 24 ]
    The primary safety endpoint will be the numbers of patients with hemoglobin <10 g/dL (anemia) at any time during the treatment period. The comparison of anemia rates between taribavirin and ribavirin groups will be carried out using the Fisher's exact test or Chi-square test. The 95% confidence interval of the difference in proportion will be analyzed.

  2. Patients With Undetected Hepatitis C Virus (HCV) Ribonucleic Acid (RNA) (<100 Copies/mL) at Treatment Week Follow-Up 24 [ Time Frame: Treatment Week Follow-Up 24 ]
  3. Relapsers at Follow-Up Visit 24 [ Time Frame: Follow-Up Week 24 ]
    Includes patients who had undetectable Hepatitis Virus C (HVC) Ribonucleic Acid (RNA) at their last visit on drug.


Eligibility Criteria
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Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Subject Inclusion Criteria

To be eligible for enrollment, patients must meet all of the following criteria:

  1. At least 18 years of age
  2. Diagnosed with compensated chronic HCV genotype 1 infection that has not been treated with interferon, peginterferon, ribavirin or any experimental therapy for >28 days

2a Serum HCV RNA >2000 copies/mL (780 IU/mL) 2b Liver biopsy performed within 3 years prior to screening consistent with chronic HCV infection 2c Criteria for compensated HCV infection, including normal prothrombin time, serum albumin and bilirubin levels (unless due to non-hepatitis factors) and no history or evidence of bleeding esophageal varices, ascites, or hepatic encephalopathy

3 History of alanine aminotransferase (ALT) elevation either within 6 months prior to screening, at screening, or on retest 2 weeks after a negative screening test, or histologic evidence of HCV infection and a detectable viral load

4 Platelet count ≥90,000/mm3

5 Absolute neutrophil count ≥1200/mm3

6 Hemoglobin ≥12.0 g/dL for females or ≥13.0 g/dL for males

7 Antinuclear antibody (ANA) titer ≤1:320

8 Serum creatinine <1.5 mg/dL

9 HbA1c ≤8.5% for diabetic patients

10 Normal or adequately controlled TSH on prescription medication

11 Alpha fetoprotein (AFP) <20 ng/mL or hepatocellular carcinoma ruled out (ultrasound, CT or MRI scan) within 6 months prior to the study (Patients with an AFP >20 ng/mL must have ongoing hepatocellular carcinoma screening during study as part of the patient's routine medical care)

12 All other clinical laboratory values within normal limits, unless judged not clinically significant by the investigator

13 Sterile or infertile (defined as vasectomy, tubal ligation, postmenopausal, or hysterectomy), or willing to use an approved method of double-barrier contraception (hormonal plus barrier or barrier plus barrier, eg, diaphragm plus condom) from the time of first dose administration until 6 months after the last dose

14 Capable of understanding instructions, adhering to study schedules and requirements, and willing to provided informed consent

Subject Exclusion Criteria

Patients who have any of the following during the screening or Day 1 visit are not eligible for enrollment in this study:

  1. Positive HIV or HbsAg serology
  2. Severe psychiatric or neuropsychiatric disorders including severe depression, history of suicidal ideations or suicide attempt(s). (This would include patients with a history of suicidal ideations or suicide attempt(s) that occurred when the patient was a minor or many years ago; if the event occurred while under the influence of alcohol or drugs; if the suicidal ideations or suicide attempt(s) were connected to a traumatic event; if the patient was not hospitalized or treated; if the patient has obtained psychiatric clearance for treatment)
  3. History or clinical manifestations of significant metabolic, hematological, pulmonary, ischemic or unstable heart disease, gastrointestinal, neurological, renal, urological, endocrine, ophthalmologic (including severe retinopathy), or immune mediated disease
  4. History of thalassemia or other hemoglobinopathies (even if the hemoglobin is normal)
  5. Chronic hepatic disease other than hepatitis C
  6. Organ or bone marrow transplant
  7. Chronic (greater than 30 days) use of immunosuppressive medications including steroids in doses equivalent to 10 mg of prednisone or higher, 30 days prior to and anytime during the course of the study
  8. Female patients who are breast-feeding or have a positive pregnancy test at any time during the study
  9. Males whose female partners are pregnant
  10. Patients who have had a malignancy diagnosed and/or treated within the past 5 years, except for localized squamous or basal cell cancers treated by local excision
  11. Patients who have participated in a clinical trial and have received an investigational drug within 30 days prior to screening
  12. History of alcoholism or drug addiction 1 year prior to screening
  13. The use of methadone, buprenorphine or any similar drug, regardless of the prescribed indication or the length of time the patient has been on the drug
  14. Chronic (>4 weeks duration) diarrhea, including irritable bowel disease
  15. Fibrosis score F4 (cirrhosis) based on Metavir or equivalent index
  16. Weight >128 kg or <40 kg
  17. Patients infected with mixed HCV genotypes
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00446134


Locations
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United States, California
Cedars-Sinai Medical Center, 8635 W. 3rd Street, Suite 590W
Los Angeles, California, United States, 90048
Sponsors and Collaborators
Bausch Health Americas, Inc.
Investigators
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Principal Investigator: Fred Poordad, MD Cedars-Sinai Medical Center
More Information
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Publications of Results:
Poordad F, Lawitz E, Pozza R, et al. Efficacy and safety of weight-based regimens of taribavirin or ribavirin, given with peginterferon alfa-2b, 12 weeks after treatment (SVR12) in naive patients with genotype 1 hepatitis C. J Hepatol. 2009;50 Suppl 1:S8
Poordad F, Lawitz E, Chun E, Hammond J. Treatment week 12 results of weight-based taribavirin versus weight-based ribavirin, both with peginterferon alfa-2b, in naive chronic hepatitis C, genotype 1 patients. J Hepatol. 2008;48 Suppl 2:S373

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Responsible Party: Bausch Health Americas, Inc.
ClinicalTrials.gov Identifier: NCT00446134    
Other Study ID Numbers: RNA003142-204
First Posted: March 12, 2007    Key Record Dates
Results First Posted: July 27, 2012
Last Update Posted: July 27, 2012
Last Verified: June 2012
Keywords provided by Bausch Health Americas, Inc.:
Phase 2b Dose-Ranging Study
Additional relevant MeSH terms:
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Hepatitis A
Hepatitis C
Hepatitis C, Chronic
Hepatitis
Hepatitis, Chronic
Liver Diseases
Digestive System Diseases
Hepatitis, Viral, Human
Virus Diseases
Infections
Enterovirus Infections
 Picornaviridae Infections
RNA Virus Infections
Blood-Borne Infections
Communicable Diseases
Flaviviridae Infections
Ribavirin
Taribavirin
Antimetabolites
Molecular Mechanisms of Pharmacological Action
Antiviral Agents
Anti-Infective Agents