title: Factors contributing to antiviral effect of adefovir dipivoxil therapy added to ongoing lamivudine treatment in patients with lamivudine-resistant chronic hepatitis B.
abstract: OBJECTIVE
  The antiviral effect of adefovir dipivoxil (ADV) added to ongoing lamivudine (LAM) treatment for LAM-resistant chronic hepatitis B (CHB) differs among patients. We investigated clinical factors affecting the response to ADV therapy in LAM-resistant CHB.
  
  
  METHODS
  The subjects were 75 LAM-resistant CHB patients treated with ADV in addition to LAM. Virological response (VR) was defined as HBV DNA clearance (<2.6 logcopies/ml) at 12 months after the start of ADV therapy. Clinical factors contributing to VR were examined by univariate and multivariate analyses.
  
  
  RESULTS
  Lower HBV DNA at baseline and negative hepatitis B e antigen (HBeAg) were significant factors affecting VR in univariate analysis. In multivariate analysis, lower HBV DNA at baseline (P = 0.005), negative HBeAg (P = 0.009), and higher ALT (P = 0.036) were significant independent factors contributing to VR. In HBeAg-positive patients, HBV DNA clearance was more frequently observed during ADV therapy in patients with baseline HBV DNA < or = 7.0 logcopies/ml than in those with baseline HBV DNA >7.0 logcopies/ml. By contrast, the link of lower HBV DNA at baseline to better therapeutic response was not evident in HBeAg-negative patients.
  
  
  CONCLUSIONS
  In ADV therapy added to ongoing LAM treatment for LAM-resistant CHB, lower baseline HBV DNA and negative HBeAg contributed to a better antiviral effect. Addition of ADV should be done promptly before marked increase in HBV DNA, especially in CHB patients showing LAM resistance positive for HBeAg.
authors.affiliation: Department of Gastroenterology and Hepatology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
authors.forename: Nao
authors.initials: N
authors.lastname: Kurashige
authors.forename: Naoki
authors.initials: N
authors.lastname: Hiramatsu
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Ohkawa
authors.forename: Takayuki
authors.initials: T
authors.lastname: Yakushijin
authors.forename: Shinichi
authors.initials: S
authors.lastname: Kiso
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Kanto
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Takehara
authors.forename: Akinori
authors.initials: A
authors.lastname: Kasahara
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Doi
authors.forename: Akira
authors.initials: A
authors.lastname: Yamada
authors.forename: Masahide
authors.initials: M
authors.lastname: Oshita
authors.forename: Eiji
authors.initials: E
authors.lastname: Mita
authors.forename: Hideki
authors.initials: H
authors.lastname: Hagiwara
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Nagase
authors.forename: Harumasa
authors.initials: H
authors.lastname: Yoshihara
authors.forename: Eijiro
authors.initials: E
authors.lastname: Hayashi
authors.forename: Yasuharu
authors.initials: Y
authors.lastname: Imai
authors.forename: Michio
authors.initials: M
authors.lastname: Kato
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kashihara
authors.forename: Norio
authors.initials: N
authors.lastname: Hayashi
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives* / Q000627:therapeutic use; D000328:Adult; D000368:Aged; D000998:Antiviral Agents / Q000627:therapeutic use*; D004279:DNA, Viral / Q000032:analysis; D004359:Drug Therapy, Combination; D005260:Female; D006514:Hepatitis B Surface Antigens / Q000032:analysis; D006513:Hepatitis B e Antigens / Q000032:analysis; D019694:Hepatitis B, Chronic / Q000188:drug therapy*; D006801:Humans; D019259:Lamivudine / Q000008:administration & dosage*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D063065:Organophosphonates / Q000627:therapeutic use*; D019562:Viral Load
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral; D006514:Hepatitis B Surface Antigens; D006513:Hepatitis B e Antigens; D063065:Organophosphonates; D019259:Lamivudine; D000225:Adenine; C106812:adefovir dipivoxil