Tohoku J. Exp. Med., 2008, 216(3)

Hepatitis B Virus Genotype-Associated Variability in Antiviral Response to Adefovir Dipivoxil Therapy in Chinese Han Population

AI-ZHONG ZENG,^1,2 HUI DENG,² CHUNG YANG,² XIAO-JUAN XIN,² QING-LING LI,¹ JIN-JUN GUO,³ WENG-XIANG HUANG² and AI-LONG HUANG¹

¹Institute for Viral Hepatitis, Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing, China
²Department of Infectious Diseases, the First Affiliated Hospital of Chongqing Medical University, Chongqing, China
³Department of Gastroenterology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, China

It is well known that different genotypes of hepatitis B virus (HBV) have a different sensitivity to interferon-α or lamivudine (nucleoside analogue) antiviral therapy. However, for adefovir dipivoxil (ADV, a nucleotide analogue), the antiviral response of the different genotypes remains to be clarified. In order to evaluate the response of HBV genotypes to ADV therapy and to identify factors that might affect initial virological response, we performed a retrospective analysis on patients with chronic hepatitis B (CHB) in Chinese Han population. The study included 183 patients, who had been tested positive for hepatitis B e antigen (HBeAg) and had been treated with ADV (10 mg/day) for 48 weeks. The numbers of patients infected with HBV genotype B and genotype C were 98 and 75 cases, respectively, and the remaining 10 patients were mixture infection of genotypes B plus C or genotypes B plus D. The mean HBV-DNA reduction and HBV-DNA seroclearance of genotypes B and C at 48 weeks were 3.6 log₁₀ and 3.1log₁₀ copies/ml (p < 0.05) and 41.8% and 34.6% (p < 0.05), respectively. There were no statistically significant differences between genotypes B and C in terms of HBeAg loss, anti-HBe seroconversion and normalization of serum alanine aminotransferase (ALT). Multivariate analysis showed that young age, low pretreatment HBV-DNA and/or elevated ALT level might be independent predictive factors associated with initial virological response. Thus, in Han CHB patients who are HBeAg-positive, HBV genotype B shows a better virological response to ADV therapy than does genotype C.

keywords —— hepatitis B virus; genotype; initial virological response; adefovir dipivoxil; chronic hepatitis B.

© 2008 Tohoku University Medical Press

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Tohoku J. Exp. Med., 2008, 216, 205-211

Correspondence: Ai-long Huang, Prof., Institute for Viral Hepatitis, Key Laboratory of Molecular Biology on Infectious Diseases, Ministry of Education, Chongqing Medical University, Chongqing 400016, P.R. China.

e-mail: ahuang1964@yahoo.com.cn