title: Adefovir dipivoxil alone or in combination with lamivudine in patients with lamivudine-resistant chronic hepatitis B.
abstract: OBJECTIVE
  Adefovir dipivoxil possesses potent in vitro and in vivo antiviral activity in wild-type hepatitis B. This study assessed the safety and efficacy of adefovir dipivoxil alone and in combination with lamivudine compared with ongoing lamivudine therapy in patients with chronic hepatitis B with compensated liver disease and lamivudine-resistant hepatitis B virus (HBV).
  
  
  METHODS
  Fifty-nine hepatitis B e antigen (HBeAg)-positive patients with genotypic evidence of lamivudine-resistant HBV, serum alanine aminotransferase (ALT) level > or =1.2 times the upper limit of normal, and serum HBV DNA level > or =6 log(10) copies/mL despite ongoing treatment with lamivudine were randomized to adefovir dipivoxil 10 mg, lamivudine 100 mg, or addition of adefovir dipivoxil to ongoing lamivudine daily. The primary end point was the time-weighted average change from baseline in serum HBV DNA level (DAVG) up to week 16.
  
  
  RESULTS
  Rapid reductions in serum HBV DNA level were seen by 4 weeks in all recipients of adefovir dipivoxil; DAVG(16) was -0.07 in the lamivudine group compared with -2.45 and -2.46 log(10) copies/mL in the adefovir dipivoxil/lamivudine and adefovir dipivoxil monotherapy groups, respectively (P < 0.001). Median change from baseline in serum HBV DNA level at week 48 was 0.0, -3.59, and -4.04 log(10) copies/mL in the lamivudine, adefovir dipivoxil/lamivudine, and adefovir dipivoxil groups, respectively. ALT level normalized in 10 of 19 (53%) and 9 of 18 (47%) recipients of adefovir dipivoxil/lamivudine and adefovir dipivoxil, respectively, compared with 1 of 19 (5%) recipients of lamivudine. Three patients receiving adefovir dipivoxil or adefovir dipivoxil/lamivudine and none receiving lamivudine monotherapy were HBeAg negative at week 48 and one became hepatitis B surface antigen negative.
  
  
  CONCLUSIONS
  These data, limited to patients with compensated liver disease, indicate that adefovir dipivoxil alone or in combination with ongoing lamivudine therapy provides effective antiviral therapy in patients with lamivudine-resistant HBV.
authors.affiliation: Division of Gastroenterology, University of California, San Francisco, CA 94143, USA. mpeters@itsa.ucsf.edu
authors.forename: Marion G
authors.initials: MG
authors.lastname: Peters
authors.forename: H w
authors.initials: Hw
authors.lastname: Hann Hw
authors.forename: Paul
authors.initials: P
authors.lastname: Martin
authors.forename: E Jenny
authors.initials: EJ
authors.lastname: Heathcote
authors.forename: P
authors.initials: P
authors.lastname: Buggisch
authors.forename: R
authors.initials: R
authors.lastname: Rubin
authors.forename: M
authors.initials: M
authors.lastname: Bourliere
authors.forename: K
authors.initials: K
authors.lastname: Kowdley
authors.forename: C
authors.initials: C
authors.lastname: Trepo
authors.forename: D f
authors.initials: Df
authors.lastname: Gray Df
authors.forename: M
authors.initials: M
authors.lastname: Sullivan
authors.forename: K
authors.initials: K
authors.lastname: Kleber
authors.forename: R
authors.initials: R
authors.lastname: Ebrahimi
authors.forename: S
authors.initials: S
authors.lastname: Xiong
authors.forename: Carol L
authors.initials: CL
authors.lastname: Brosgart
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives* / Q000627:therapeutic use*; D000328:Adult; D000368:Aged; D000410:Alanine Transaminase / Q000097:blood; D000998:Antiviral Agents / Q000627:therapeutic use*; D004279:DNA, Viral / Q000097:blood; D004311:Double-Blind Method; D004352:Drug Resistance, Microbial / Q000235:genetics; D004359:Drug Therapy, Combination; D005260:Female; D005838:Genotype; D006513:Hepatitis B e Antigens / Q000032:analysis; D006515:Hepatitis B virus / Q000235:genetics / Q000502:physiology*; D019694:Hepatitis B, Chronic / Q000188:drug therapy* / Q000821:virology*; D006801:Humans; D019259:Lamivudine / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D063065:Organophosphonates; D018894:Reverse Transcriptase Inhibitors / Q000627:therapeutic use*; D016896:Treatment Outcome
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral; D006513:Hepatitis B e Antigens; D063065:Organophosphonates; D018894:Reverse Transcriptase Inhibitors; D019259:Lamivudine; D000410:Alanine Transaminase; D000225:Adenine; C106812:adefovir dipivoxil