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JOURNAL ARTICLE
REVIEW
Peginterferon-alpha2a (40 kDa) (Pegasys) for hepatitis B.
Expert Review of Anti-infective Therapy 2005 August
Chronic hepatitis B virus is a serious and life threatening disease afflicting 350 million people worldwide, despite the availability of effective vaccines. Thus far, current monotherapy with conventional interferon-alpha, lamivudine and adefovir dipivoxil remains unsatisfactory. In addition, the use of conventional interferon-alpha needs to be administered subcutaneously three-times weekly and is associated with frequent adverse events. Although nucleoside/nucleotide analogs such as lamivudine and adefovir dipivoxil are well tolerated and can normalize serum alanine aminotransaminase rapidly, 1-year therapy with either lamivudine or adefovir dipivoxil results in low hepatitis B e antigen seroconversion rates. In hepatitis B e antigen-negative patients, most would relapse after lamivudine has been discontinued. Peginterferon-alpha2a, an immunomodulatory agent, is a new drug that has just completed Phase III clinical trials for the treatment of both hepatitis B e antigen-positive and -negative chronic hepatitis B virus infection. The advantage of peginterferon-alpha2a in achieving sustained virologic response over nucleoside/nucleotide analogs is particularly obvious in the hepatitis B e antigen-negative group. In both studies, sustained off-treatment response is superior to the use of monotherapy with lamivudine, and concomitant use of lamivudine and pegnterferon-alpha2a does not have advantages over the use of peginterferon-alpha2a alone. These recent data put peginterferon-alpha2a as the antihepatitis B virus therapy of choice, especially in young and motivated patients with chronic hepatitis B virus infection. However, despite the superiority of peginterferon-alpha2a over currently licensed nucleoside/nucleotide analogs, more research needs to be conducted in order to find the most optimal treatment regimen in our fight against chronic hepatitis B virus infection.
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