A 1-year trial of telbivudine, lamivudine, and the combination in patients with hepatitis B e antigen-positive chronic hepatitis B

University of Hong Kong, China.
Gastroenterology (Impact Factor: 16.72). 08/2005; 129(2):528-36. DOI: 10.1016/j.gastro.2005.05.053
Source: PubMed


A previous 4-week trial of telbivudine in patients with chronic hepatitis B indicated marked antiviral effects with good tolerability, leading to the present 1-year phase 2b trial.
This randomized, double-blind, multicenter trial evaluated the efficacy and safety of telbivudine 400 or 600 mg/day and telbivudine 400 or 600 mg/day plus lamivudine 100 mg/day (Comb400 and Comb600) compared with lamivudine 100 mg/day in hepatitis B e antigen (HBeAg)-positive adults with compensated chronic hepatitis B.
A total of 104 patients were randomized 1:1:1:1:1 among the 5 groups. Median reductions in serum hepatitis B virus (HBV) DNA levels at week 52 (log(10) copies/mL) were as follows: lamivudine, 4.66; telbivudine 400 mg, 6.43; telbivudine 600 mg, 6.09; Comb400, 6.40; and Comb600, 6.05. At week 52, telbivudine monotherapy showed a significantly greater mean reduction in HBV DNA levels (6.01 vs 4.57 log(10) copies/mL; P < .05), clearance of polymerase chain reaction-detectable HBV DNA (61% vs 32%; P < .05), and normalization of alanine aminotransferase levels (86% vs 63%; P < .05) compared with lamivudine monotherapy, with proportionally greater HBeAg seroconversion (31% vs 22%) and less viral breakthrough (4.5% vs 15.8%) (P = NS for both). Combination treatment was not better than telbivudine alone. All treatments were well tolerated. In exploratory scientific analyses, clinical efficacy at 1 year appeared related to reduction in HBV DNA levels in the first 6 months of treatment.
Patients with chronic hepatitis B treated with telbivudine exhibited significantly greater virologic and biochemical responses compared with lamivudine. Results with the combination regimens were similar to those obtained with telbivudine alone. These data support the ongoing phase 3 evaluation of telbivudine for treatment of patients with chronic hepatitis B.

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    • "These studies were also excluded from the base case analysis. One study, TBVIG, reported median rather than mean baseline viral load and was hence also excluded from the base case-adjusted analysis [30]. Information on this study is provided in Table 1. "
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    • "It undergoes phosphorylation by cellular enzymes to form the active metabolite, telbivudine triphosphate which incorporates into viral DNA competing with the natural substrate, thymidine triphosphate, and causing DNA chain termination, resulting in inhibition of HBV replication. It has demonstrated potent activity against hepatitis B with a significantly higher rate of response and superior viral suppression compared with lamivudine and adefovir [71]. It is generally well tolerated with a low adverse effect. "
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