title: Early viral kinetics of telbivudine and entecavir: results of a 12-week randomized exploratory study with patients with HBeAg-positive chronic hepatitis B.
abstract: We characterized the early viral kinetic profiles of telbivudine and entecavir and the effects of these potent nucleoside analogs on hepatitis B virus (HBV) DNA and alanine aminotransferase levels in adults with hepatitis B e antigen-positive compensated chronic hepatitis B. Forty-four patients were enrolled in this open-label, parallel-group, multicenter study and randomized to receive telbivudine or entecavir for 12 weeks. Reductions in hepatitis B virus DNA and alanine aminotransferase levels from baseline to weeks 2, 4, 8, and 12 were assessed. Viral kinetic parameters, including viral clearance per day, loss of infected cells per day, and efficiency of inhibition of viral production, were estimated by using a biphasic mathematical model. Statistical analyses were limited to descriptive analyses. The 2 treatment groups achieved similar reductions in HBV DNA and alanine aminotransferase levels. Mean reductions in levels of hepatitis B virus DNA at week 12 were 6.6 +/- 1.6 and 6.5 +/- 1.5 log(10) copies/ml for the telbivudine- and entecavir-treated patients, respectively. There were no significant differences between groups in values for mean viral clearance per day, mean loss of infected cells per day, or efficiency of blocking viral production. The safety profiles for both medications were favorable. During the first 12 weeks of treatment, telbivudine and entecavir demonstrated similar antiviral potencies, resulting in a rapid and profound suppression of serum hepatitis B virus DNA and reduction of alanine aminotransferase levels. No differences in the effects of these 2 agents on early viral kinetics were observed. Both medications were well tolerated.
authors.affiliation: Asan Medical Center, University of Ulsan, Seoul, South Korea. djsuh@amc.seoul.kr
authors.forename: Dong Jin
authors.initials: DJ
authors.lastname: Suh
authors.forename: Soon Ho
authors.initials: SH
authors.lastname: Um
authors.forename: Eva
authors.initials: E
authors.lastname: Herrmann
authors.forename: Ju-Hyun
authors.initials: JH
authors.lastname: Kim
authors.forename: Young Sok
authors.initials: YS
authors.lastname: Lee
authors.forename: Heon Ju
authors.initials: HJ
authors.lastname: Lee
authors.forename: Myung Seok
authors.initials: MS
authors.lastname: Lee
authors.forename: Youn-Jae
authors.initials: YJ
authors.lastname: Lee
authors.forename: Weibin
authors.initials: W
authors.lastname: Bao
authors.forename: Patricia
authors.initials: P
authors.lastname: Lopez
authors.forename: Han Chu
authors.initials: HC
authors.lastname: Lee
authors.forename: Claudio
authors.initials: C
authors.lastname: Avila
authors.forename: Stefan
authors.initials: S
authors.lastname: Zeuzem
mesh_terms: D000328:Adult; D000410:Alanine Transaminase / Q000097:blood; D000998:Antiviral Agents / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D004279:DNA, Viral / Q000097:blood; D005260:Female; D006147:Guanine / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use; 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; D007700:Kinetics; D008297:Male; D008875:Middle Aged; D009705:Nucleosides / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D011744:Pyrimidinones / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D000077712:Telbivudine; D013936:Thymidine / Q000031:analogs & derivatives; D016896:Treatment Outcome
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral; D006513:Hepatitis B e Antigens; D009705:Nucleosides; D011744:Pyrimidinones; D000077712:Telbivudine; C413685:entecavir; D006147:Guanine; D000410:Alanine Transaminase; D013936:Thymidine