Safety, efficacy, and pharmacokinetics of adefovir dipivoxil in children and adolescents (age 2 to <18 years) with chronic hepatitis B

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
Maureen M JonasE M Sokal

Abstract

This study investigated the efficacy, safety, and pharmacokinetics of adefovir dipivoxil (ADV) in children and adolescents with chronic hepatitis B (CHB). A total of 173 treatment-naive and treatment-experienced children with hepatitis B e antigen (HBeAg)+ CHB were randomized to ADV or placebo. Randomization was stratified by age (2 to <7 years; >7 to <12 years; >12 to <18 years) and prior treatment. Significantly more ADV-treated subjects aged 12 to <18 years achieved the primary efficacy endpoint (serum hepatitis B virus [HBV] DNA <1,000 copies/mL and normal alanine aminotransferase) compared to placebo-treated subjects (23% versus 0%; P = 0.007). In the younger groups, differences between ADV and placebo at the end of blinded treatment were not statistically significant. More ADV-treated subjects had HBeAg seroconversion: 18 of 113 (15.9%) versus three of 57 (5.3%) (but P = 0.051), and more met the combined endpoint of HBeAg seroconversion, HBV DNA <1,000 copies/mL and normal alanine aminotransferase (12/113 versus 0/57; P = 0.009). No subject developed an ADV-associated mutation that has been linked to HBV DNA rebound (that is, mutations rtN236T or rtA181V). ADV plasma concentrations were comparable across groups and within...Continue Reading

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