title: Quantitative polymerase chain reaction assay for serum hepatitis B virus DNA as a predictive factor for post-treatment relapse after lamivudine induced hepatitis B e antigen loss or seroconversion.
abstract: OBJECTIVE
  Lamivudine induces favourable virological and biochemical responses but post-treatment relapses are frequent, even in patients with hepatitis B e antigen (HBeAg) loss or seroconversion. The aim of this study was to determine whether extended lamivudine therapy for up to 12 months after HBeAg loss/seroconversion could decrease the risk of post-treatment virological relapse. In addition, we monitored serum hepatitis B virus (HBV) DNA levels using a quantitative polymerase chain reaction (PCR) assay during extended lamivudine therapy and analysed predictive factors for post-treatment relapse.
  
  
  METHODS
  A total of 49 patients who exhibited HBeAg loss/seroconversion during lamivudine therapy received extended lamivudine therapy for six months (group 1, n=23) or 12 months (group 2, n=26) after HBeAg loss/seroconversion. Serum HBV DNA levels were quantified by a PCR based assay at the time of HBeAg loss/seroconversion, and at cessation of therapy.
  
  
  RESULTS
  Post-treatment virological relapse rates at two years were 59% in group 1 and 50% in group 2. Age, time interval to HBeAg loss/seroconversion, and serum HBV DNA levels at the time of cessation of therapy were independent predictive factors for post-treatment relapse. The post-treatment relapse rate was 37% at two years in patients with serum HBV DNA levels of <200 copies/ml but 73% in those with > or =10(3) copies/ml.
  
  
  CONCLUSIONS
  Extended lamivudine therapy for up to 12 months did not decrease the rate of post-treatment virological relapse, and monitoring of serum HBV DNA by a quantitative PCR method was helpful in predicting post-treatment relapse.
authors.affiliation: Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Centre, Seoul, Korea.
authors.forename: H C
authors.initials: HC
authors.lastname: Lee
authors.forename: D J
authors.initials: DJ
authors.lastname: Suh
authors.forename: S H
authors.initials: SH
authors.lastname: Ryu
authors.forename: H
authors.initials: H
authors.lastname: Kim
authors.forename: J W
authors.initials: JW
authors.lastname: Shin
authors.forename: Y-S
authors.initials: YS
authors.lastname: Lim
authors.forename: Y-H
authors.initials: YH
authors.lastname: Chung
authors.forename: Y S
authors.initials: YS
authors.lastname: Lee
mesh_terms: D000328:Adult; D000998:Antiviral Agents / Q000627:therapeutic use*; D004279:DNA, Viral / Q000097:blood / Q000235:genetics; D005260:Female; D006513:Hepatitis B e Antigens / Q000097:blood* / Q000235:genetics; D006515:Hepatitis B virus / Q000235:genetics; D019694:Hepatitis B, Chronic / Q000188:drug therapy*; D006801:Humans; D019259:Lamivudine / Q000627:therapeutic use*; D008297:Male; D009154:Mutation / Q000235:genetics; D016133:Polymerase Chain Reaction / Q000379:methods; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012008:Recurrence
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral; D006513:Hepatitis B e Antigens; D019259:Lamivudine