title: Hepatitis B e antigen-negative chronic hepatitis B in Hong Kong.
abstract: Hepatitis B e antigen-negative chronic hepatitis B (e-CHB) has been reported in Asia but its prevalence and clinical significance have not been determined. The aims of this study were to determine the prevalence of e-CHB in Hong Kong and the frequency of precore and core promoter mutations in these patients. A cross-sectional study was performed in 350 consecutive Chinese patients (230 men and 120 women; mean age +/-SD, 42 +/- 13 years) with chronic hepatitis B virus infection. A total of 243 (69%) patients were hepatitis B e antigen (HBeAg)-negative of whom 15% had clinical cirrhosis. In the remaining 85% of patients, 63% had normal and 22% had elevated transaminases. Serum hepatitis B virus (HBV) DNA was detectable using branched DNA assay in 46% of HBeAg-negative patients with clinical cirrhosis/elevated transaminases. Forty-five percent of the patients with e-CHB had the precore stop codon mutation, and an additional 41% had core promoter changes. There was no correlation between the presence of precore/core promoter mutations and liver disease or HBV-DNA levels. Overall, 17% of HBeAg-negative patients were viremic and had evidence of chronic liver disease (e-CHB) with mean HBV-DNA levels comparable with that in HBeAg-positive patients. In summary, we found that e-CHB may be present in up to 17% of HBeAg-negative patients seen in a tertiary referral center in Hong Kong. e-CHB may be a heterogeneous condition and is not invariably associated with the precore HBV mutant. Population studies are needed to determine the true prevalence of e-CHB in Asia and to assess its natural course and response to treatment.
authors.affiliation: Division of Gastroenterology, University of Michigan and VA Medical Center, Ann Arbor, MI 48109, USA.
authors.forename: H L
authors.initials: HL
authors.lastname: Chan
authors.forename: N W
authors.initials: NW
authors.lastname: Leung
authors.forename: M
authors.initials: M
authors.lastname: Hussain
authors.forename: M L
authors.initials: ML
authors.lastname: Wong
authors.forename: A S
authors.initials: AS
authors.lastname: Lok
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000410:Alanine Transaminase / Q000097:blood; D002681:China / Q000208:ethnology; D003430:Cross-Sectional Studies; D004279:DNA, Viral / Q000097:blood; D005260:Female; D006513:Hepatitis B e Antigens / Q000097:blood*; D006515:Hepatitis B virus / Q000235:genetics*; D019694:Hepatitis B, Chronic / Q000097:blood / Q000453:epidemiology / Q000276:immunology*; D006723:Hong Kong / Q000453:epidemiology; D006801:Humans; D008103:Liver Cirrhosis / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009154:Mutation; D011401:Promoter Regions, Genetic; D012737:Sex Factors; D014758:Viral Core Proteins / Q000235:genetics
chemical_list: D004279:DNA, Viral; D006513:Hepatitis B e Antigens; D014758:Viral Core Proteins; D000410:Alanine Transaminase