Which among the following is the best to evaluate alpha interferon therapy for HCV?

(A) Quantification of HCV RNA # During therapy, serum alanine aminotransferase (ALT) levels decrease to normal and hepatitis C virus (HCV) RNA decreases in 40% to 60% of patients. However, most patients relapse after therapy withdrawal, so that no more than 15% to 25% achieve a sustained response.> Re-treatment has been evaluated in studies using different regimens and forms of alpha interferon in different cohorts of patients at different times after initial therapy.> The best predictor of sustained response to re-treatment in patients who had relapsed was a negative serum HCV-RNA test by polymerase chain reaction at the end of the first course.> These results, which have been confirmed in a recent prospective, randomized controlled trial, indicate that nonresponders to interferon should not be re-treated with interferon alone, whereas patients who relapse after a 6-month course of alpha interferon therapy have an indication to be re-treated for at least 12 months, especially if serum HCV RNA was negative at the end of the first course of treatment.