title: [Clinical outcomes after discontinuation of Lamivudine in chronic hepatitis B patients with Lamivudine resistant HBV mutant].
abstract: OBJECTIVE
  The therapeutic strategies of applying adefovir for treating lamivudine resistant HBV mutants are controversial. Thus, we observed the clinical outcomes after discontinuation of lamivudine to establish the timing to initiate adefovir therapy.
  
  
  METHODS
  Fifty chronic hepatitis B (CHB) patients with lamivudine resistant HBV mutants who had received lamivudine for more than 12 months were included in the study. We investigated the clinical outcomes at 6 months after the end of treatment (EOT). We compared the serial clinical outcomes among respective groups based on serum ALT at the EOT and the clinical characteristics of patients with or without acute exacerbation (AE) and the HBeAg loss. We also investigated the predictive parameters of AE and HBeAg loss.
  
  
  RESULTS
  Fifteen patients (30%) had experienced AE at 6 months after the EOT. Four patients received antiviral agents because of their hepatic decompensation. Patients with AE had higher serum ALT values and lower HBV DNA titers at EOT compared with those patients without AE. Serum ALT at the EOT was the predictive parameter of AE. Eight patients (21.6%) had newly developed HBeAg loss at 6 months after EOT. The total bilirubin at EOT was the predictive parameter of HBeAg loss.
  
  
  CONCLUSIONS
  CHB patients with lamivudine resistant HBV mutants had favorable clinical outcomes at 6 months after EOT. Therefore, we can consider observing the clinical courses after discontinuation of lamivudine and it is not always required to overlap the adefovir for treating lamivudine resistant HBV mutants except for the treatment of patients with a high risk of developing decompensation.
authors.affiliation: Department of Internal Medicine, College of Medicine, Pochon CHA University, Sungnam, Korea.
authors.forename: Jeong Ki
authors.initials: JK
authors.lastname: Kim
authors.forename: Seong Gyu
authors.initials: SG
authors.lastname: Hwang
authors.forename: Hyeuk
authors.initials: H
authors.lastname: Park
authors.forename: Hong Youp
authors.initials: HY
authors.lastname: Choi
authors.forename: Hyo Jin
authors.initials: HJ
authors.lastname: Cho
authors.forename: Kwang Hyun
authors.initials: KH
authors.lastname: Ko
authors.forename: Sung Pyo
authors.initials: SP
authors.lastname: Hong
authors.forename: Pil Won
authors.initials: PW
authors.lastname: Park
authors.forename: Nam Keun
authors.initials: NK
authors.lastname: Kim
authors.forename: Kyu Sung
authors.initials: KS
authors.lastname: Rim
mesh_terms: D000225:Adenine / Q000008:administration & dosage / Q000031:analogs & derivatives; D000328:Adult; D000998:Antiviral Agents / Q000008:administration & dosage*; D024882:Drug Resistance, Viral; D005260:Female; D006513:Hepatitis B e Antigens / Q000097:blood; D006515:Hepatitis B virus / Q000187:drug effects; D019694:Hepatitis B, Chronic / Q000188:drug therapy* / Q000821:virology; D006801:Humans; D019259:Lamivudine / Q000008:administration & dosage*; D008297:Male; D008875:Middle Aged; D063065:Organophosphonates / Q000008:administration & dosage; D018894:Reverse Transcriptase Inhibitors / Q000627:therapeutic use*; D016896:Treatment Outcome
chemical_list: D000998:Antiviral Agents; D006513:Hepatitis B e Antigens; D063065:Organophosphonates; D018894:Reverse Transcriptase Inhibitors; D019259:Lamivudine; C053001:adefovir; D000225:Adenine