A Phase 3 interventional study of Peginterferon alfa-2b (Pegetron) plus ribavirin (Rebetol) in Chronic Hepatitis C, sponsored by University Health Network, Toronto. Terminated at 12 sites in Canada. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2011-09-29.
Sponsored by University Health Network, Toronto · Phase 3, Interventional, and Treatment
The purpose of this study is to evaluate the effect of 48 vs 24 weeks of treatment with Peginterferon alfa-2b plus weight-based ribavirin on Sustained Virologic Response (SVR) and relapse rates in patients infected with genotype 3 chronic hepatitis C (CHC) who do not achieve a Rapid Virologic Response (RVR) but attain a complete Early Virologic Response (cEVR).
This study plans to address the issue of whether increasing the duration of therapy from 24 weeks to 48 weeks with PegIFNα2b 1.5mg/kg/week and using weight-based ribavirin (15mg/kg) may reduce relapse rates and thereby increase SVR rates in patients infected with genotype 3 who fail to achieve an RVR but do achieve a complete cEVR defined as undetectable HCV RNA (ie. \<50 or \<15 IU/ml by 12 weeks). This study is necessary because although most patients with genotype 3 ultimately become HCV RNA undetectable during treatment, relapse after discontinuation of therapy remains a major cause of failure to achieve SVR. This is a very important issue given that to date none of the new small molecule drugs appear effective against genotype 3 meaning that at the present time patients with genotype 3 infection have no other options. Relapse is particularly common in patients with advanced liver disease but it has been shown that if SVR can be achieved in patients with advanced disease, the risk of liver failure is significantly reduced, as may be the risk of hepatocellular carcinoma (HCC). As a consequence the need for liver transplantation is diminished and survival is improved. Identifying strategies to reduce relapse and improve rates of SVR are therefore critical.
Certain individuals are at greater risk of infection with genotype 3. In the Western world, the main risk groups are current or former drug users (IDU) and immigrants raised in South Asia (India and Pakistan) where infection likely occurs early in childhood due to exposure to contaminated instruments, needles, etc.
A second potential benefit of achieving SVR is reduction in the rate of diabetes. Diabetes has been demonstrated to be more common in those infected with Hepatitis C than in the general population - this observation was made by examination of the NHANES population based database. The prelude to the development of Type 2 diabetes is insulin resistance. Insulin resistance (IR) is present in about one third of patients chronically infected with HCV - the rate being highest in those with cirrhosis and in those who are overweight or obese. Early data indicates that although the presence of insulin resistance impairs interferon responsiveness if SVR can be achieved, insulin resistance is lost. Studies of IR in individuals infected with genotype 3 HCV are lacking. Independent of HCV infection, being born South Asian is a risk factor for Type 2 diabetes.
The issue of insulin resistance and the effectiveness of antiviral therapy in chronic hepatitis C has been addressed exclusively in Caucasians infected with genotype 1. Recent data from Japan indicates that in patients with diabetes and hepatitis C successful eradication of HCV RNA may simultaneously prevent subsequent diabetes and presumably the systemic complications of this disease.
There is little data on the rate of RVR in the South Asian population as few therapeutic trials in patients with genotype 3 infections have been reported from Pakistan and India. Estimates can only be obtained from studies performed in Caucasians from Northern Europe and North America. In the trial by Shiffman the rate of RVR in those with genotype 3 infection was 62% and preliminary report from the trial of Albuferon in those with genotype 2 and 3 indicate RVR rates ranged from 44-60% in Asians -this figure included all Asians.
There are several reasons to specifically address ways to improve the outcome of antiviral therapy in patients infected with genotype 3 CHC. Firstly virtually all treatment studies report on a combined rate of SVR achieved in genotypes 2 and 3 even though the evidence has suggested that the response to therapy is different between these two genotypes. Within populations of patients with genotype 3 infection, there may be differences as well. South Asians are predominantly infected with genotype 3a, while injection drug users typically have genotype 3b infection. There are no formal trials published in the English literature of antiviral therapy in South Asians or comparing subtypes of genotype 3.
In patients infected with genotype 1 slow response to antiviral therapy i.e. lack of RVR, is associated with a significantly higher rate of relapse in those who go on to achieve undetectable HCV RNA at 12 weeks rather than at 4 weeks into treatment. Extending treatment for a further six months reduces this relapse rate considerably. By extending treatment in patients infected with genotype 3 who had previously relapsed following only 14 weeks of therapy to 24 weeks reduced relapse rates. Thus, it is anticipated that by extending treatment from 24 to 48 weeks in those who fail to achieve a RVR (i.e. slow responders) but who do achieve a complete EVR we hope to prevent relapse off treatment. A potential added benefit of achieving SVR in this patient population, many of whom are already at high risk of T2DM, is that it may reduce the virally mediated component of IR.
2,709 studies on the registry are indexed under Hepatitis A; 142 are open to participants now.
This study's enrollment of 2 is below the median of 100 across 1,887 interventional studies indexed under Hepatitis A.
Browse Hepatitis A studies →University Health Network, Toronto is the lead sponsor of 1,411 studies on the registry; 292 are open to participants now.
Of its 17 completed or terminated interventional studies of FDA-regulated products, 3 (18%) have results posted.
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Exclusion Criteria:
Pre-existing psychiatric conditions including:
Participants will be randomized to receive only the standard 24 weeks of therapy (Peginterferon alfa-2b plus ribavirin).
Participants will be randomized to receive 24 weeks of therapy (Peginterferon alfa-2b plus ribavirin) in addition to their standard of care therapy.
Drug: Peginterferon alfa-2b (Pegetron) plus ribavirin (Rebetol)
Dosage Form: Pegetron - powder for solution; Rebetol - capsules Strength: Pegetron Redipen - 120 mcg per pen; Rebetol - 200 mg Route of Administration: Pegetron - subcutaneous; Rebetol - oral
Also known as: Pegetron, Rebetol
End of treatment response
Undetectable hepatitis C virus (HCV) RNA at 24 weeks following end of therapy
Time frame: 24 weeks following end of therapy
Relapse rate
Undetectable HCV RNA at end of treatment but detectable HCV RNA at 24 weeks following end of therapy
Time frame: 24 weeks following end of therapy
This study is terminated, as verified in Mar 2010. You cannot join it, but the record below documents what was studied.
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University Health Network, Toronto