Evaluation of initial virological response to adefovir and development of adefovir-resistant mutations in patients with chronic hepatitis B
The aims of the present study were to assess initial virological response (IVR) to adefovir (ADV) treatment for chronic hepatitis B, to identify patients with suboptimal response and to determine the incidence of ADV‐resistant mutants. All patients treated with ADV for at least 12 months were evalua...
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Published in | Journal of viral hepatitis Vol. 15; no. 5; pp. 392 - 398 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford, UK
Blackwell Publishing Ltd
01.05.2008
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Subjects | |
Online Access | Get full text |
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Summary: | The aims of the present study were to assess initial virological response (IVR) to adefovir (ADV) treatment for chronic hepatitis B, to identify patients with suboptimal response and to determine the incidence of ADV‐resistant mutants. All patients treated with ADV for at least 12 months were evaluated for virological response and ADV resistance. IVR was defined as a reduction ≥4 log10 IU/mL in hepatitis B virus (HBV)‐DNA at month 6. Forty‐two patients were analysed. Mean treatment duration was 23 ± 7 months; 50% had prior lamivudine (LAM) therapy (LAM resistance 62%); 88% were hepatitis B e antigen (HBeAg)‐negative; and 76% carried genotype D. IVR was seen in 40.5% of patients. Higher baseline ALT level was the only factor associated with IVR (P = 0.043). Patients with IVR achieved undetectable HBV‐DNA at month 12 in 77% of cases compared with only 5% of those without IVR (P < 0.001). Five (12%) patients developed ADV‐resistant mutations: rtN236T in four cases and one case with an rtV207L change, which has not been previously reported. This mutation was accompanied by viral rebound and alanine aminotransferase (ALT) flare. The cumulative probability of ADV‐resistant mutations at 12 and 24 months was 5% and 17% respectively. IVR defined as a reduction ≥4 log10 IU/mL in HBV‐DNA at month 6 is a useful tool to predict virological response at month 12 and to identify patients with suboptimal response to ADV. Cumulative probability of ADV resistance is higher than previously reported for nucleos(t)ide‐naïve patients. |
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Bibliography: | ArticleID:JVH966 istex:EA453ACFB75D7FF71EA26BD2C81B03AB2CE50627 ark:/67375/WNG-LL5XKJ23-D ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1352-0504 1365-2893 |
DOI: | 10.1111/j.1365-2893.2008.00966.x |