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Chronic hepatitis B virus infection is among the most common causes of chronic liver disease in children. The aim of this study was to document prospectively our experiences related to lamivudine and high-dose interferon-alpha2a combination in naïve, e antigen positive, chronic hepatitis B virus infection treatment in children. Thirty-three children diagnosed as naïve, immunoactive chronic hepatitis B were treated with lamivudine (3 mg/kg/day) and interferon-alpha2a (10 MU/m2, thrice weekly). Initially, lamivudine was initiated three months before interferon-alpha for induction, and after June 2002, both drugs were started simultaneously. After interferon-alpha was stopped, lamivudine alone was continued for six months. HBeAg seroconversion with the normalization of serum ALT was achieved at the end of treatment and at the end of follow-up for 20/33 patients. Initial mean alanine aminotransferase, 142.9 IU/L, decreased to a mean value of 31.4. End-treatment response and sustained response rates were 66.7% (14/21) and 50% (6/12), respectively, in patients that underwent lamivudine induction before interferon-alpha and in patients that began to receive the two drugs simultaneously (p=0.4). Flu-like syndrome and anorexia were the most common complaints. As our conclusions, we propose that interferon-alpha2a plus lamivudine combination therapy is highly successful and safe in children suffering from chronic hepatitis B. Lamivudine induction before interferon does not seem to be necessary. [ABSTRACT FROM AUTHOR]