title: Importance of serum concentration of adefovir for Lamivudine-adefovir combination therapy in patients with lamivudine-resistant chronic hepatitis B.
abstract: Lamivudine (LMV)-adefovir pivoxil (ADV) combination therapy suppresses the replication of LMV-resistant hepatitis B virus (HBV), although its efficacy in suppressing HBV varies among patients. This study analyzed the clinical, virological, and pharmaceutical factors that influence the effect of the combination therapy. Patients negative for hepatitis B virus e antigen (HBeAg) and with low HBV DNA titers immediately prior to the combination therapy effectively cleared serum HBV DNA (P=0.0348 and P=0.0310, respectively). The maximum concentration of ADV in serum (ADV Cmax) was higher in patients who showed HBV DNA clearance (P=0.0392), and the cumulative clearance rates of HBV DNA were significantly higher in patients with ADV Cmax equal to or greater than 24 ng/ml (P=0.0284). HBeAg negativity and lower HBV DNA at the start of the combination therapy and higher ADV Cmax were found to be independent factors for serum HBV DNA clearance. Serum creatinine increased significantly during the combination therapy, and the ADV Cmax was higher in patients with low creatinine clearance rates. In conclusion, higher serum concentrations of ADV are associated with a good response to therapy based on clearance of HBV DNA in serum. However, care should be taken to prevent worsening of renal function due to high ADV serum concentrations.
authors.affiliation: Department of Medical and Molecular Science, Division of Frontier Medical Science, Programs for Biomedical Research, Graduate School of Biomedical Science, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan.
authors.forename: Fukiko
authors.initials: F
authors.lastname: Mitsui
authors.forename: Masataka
authors.initials: M
authors.lastname: Tsuge
authors.forename: Takashi
authors.initials: T
authors.lastname: Kimura
authors.forename: Shosuke
authors.initials: S
authors.lastname: Kitamura
authors.forename: Hiromi
authors.initials: H
authors.lastname: Abe
authors.forename: Hiromi
authors.initials: H
authors.lastname: Saneto
authors.forename: Tomokazu
authors.initials: T
authors.lastname: Kawaoka
authors.forename: Daiki
authors.initials: D
authors.lastname: Miki
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Hatakeyama
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Hiraga
authors.forename: Michio
authors.initials: M
authors.lastname: Imamura
authors.forename: Yoshiiku
authors.initials: Y
authors.lastname: Kawakami
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Aikata
authors.forename: Shoichi
authors.initials: S
authors.lastname: Takahashi
authors.forename: C Nelson
authors.initials: CN
authors.lastname: Hayes
authors.forename: Harue
authors.initials: H
authors.lastname: Igarashi
authors.forename: Kentaro
authors.initials: K
authors.lastname: Morimoto
authors.forename: Masao
authors.initials: M
authors.lastname: Shimizu
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Chayama
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives* / Q000097:blood / Q000627:therapeutic use; D000328:Adult; D000368:Aged; D000998:Antiviral Agents / Q000097:blood* / Q000494:pharmacology / Q000627:therapeutic use; D004279:DNA, Viral / Q000097:blood; D024882:Drug Resistance, Viral; D004359:Drug Therapy, Combination; D005260:Female; D006515:Hepatitis B virus / Q000187:drug effects; D019694:Hepatitis B, Chronic / Q000188:drug therapy* / Q000821:virology; D006801:Humans; D019259:Lamivudine / Q000494:pharmacology* / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D063065:Organophosphonates / Q000097:blood* / Q000627:therapeutic use; D018894:Reverse Transcriptase Inhibitors / Q000097:blood* / Q000494:pharmacology / Q000627:therapeutic use; D016896:Treatment Outcome
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral; D063065:Organophosphonates; D018894:Reverse Transcriptase Inhibitors; D019259:Lamivudine; C053001:adefovir; D000225:Adenine