With pegylated interferon and ribavirin,more than half of all chronically-infected hepatitis C patients can achieve a sustained virologic response;however,patients with genotype 1 infections and those with other poor prognostic factors have relatively inferior treatment response rates. Since new therapies are still years away from approval,it is incumbent upon providers to maximize the therapeutic efficacy of today's treatment. The later the virus is undetectable in serum during treatment,the less likely it will be eradicated. Patients with a delayed or slow virologic response to therapy(at least a 2-log10 decrease in baseline hepatitis C RNA yet detectable viremia at 12 wk of therapy and undetectable virus 12 wk subsequently) may,therefore,benefit from an extended therapy course beyond one of standard duration. Although higher rates of treatment discontinuation may plague this approach,72 wk of treatment for genotype 1-infected slow-responders may improve response rates and diminish relapse rates relative to those of 48 wk. Based on data from both viral kinetic and clinical studies,therapy prolongation in slow responders may be a reasonable strategy to improve response rates in these treatment-refractory patients.
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