Hepatitis C: Less Treatment OK for Some
Study Shows Successful Outcomes for Patients Who Quit Drug Therapy Early
Jan. 3, 2008 -- Patients who respond quickly to hepatitis C (HCV) treatment may be able to safely stop therapy much sooner than is currently recommended, new research suggests.
Researchers in Italy report that cure rates were similar among HCV patients who had the recommended 48 weeks of treatment and those treated for half that time, as long as the patients had no evidence of HCV in their blood four weeks into treatment.
Hepatitis C can have different strains known as genotypes. The study included only patients with genotype 1. In a separate study involving genotype 2 and 3 patients, who tend to respond better to current treatments and have a shorter treatment course, response rates were similar among early viral responders whether they were treated with 12 weeks of treatment or the recommended 24 weeks.
The goal of HCV treatment is to achieve sustained virologic response. A sustained virologic response is defined as no detectable evidence of virus in the blood six months after finishing treatment.
Patients in both studies were treated with standard combination treatment including the long-acting version of the drug interferon and the antiviral drug ribavirin.
The studies are published in the January issue of the journal Hepatology.
Genotype and HCV Outcomes
About 3.2 million Americans have chronic HCV infection, and most of them have the more difficult-to-treat genotype 1.
Only about half of all patients with genotype 1 treated with peginterferon and ribavirin will achieve a sustained viral response, compared with 70% to 90% of patients with genotype 2 or genotype 3.
It is also increasingly clear that regardless of genotype, patients who respond early to treatment have the best chances for a cure.
With this in mind, the researchers in Italy enrolled just under 700 HCV genotype 1 patients in a study designed to compare outcomes among early responders treated for different durations.
A total of 26.6% were early-viral clearers, meaning that they achieved undetectable HCV levels by week four of treatment.
Among this subgroup of patients, 77% treated for a total of 24 weeks cleared the virus for good, compared with 87% treated for 48 weeks.