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Clin Gastroenterol Hepatol. 2015 Jun 11. pii: S1542-3565(15)00788-0. doi: 10.1016/j.cgh.2015.06.002. [Epub ahead of print]
Association Between Level of Hepatitis B Surface Antigen and Relapse After Entecavir Therapy for Chronic HBV Infection.
Chen CH1, Hung CH1, Hu TH1, Wang JH1, Lu SN1, Su PF2, Lee CM3.
Author information
1Division of Hepatogastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, National Cheng Kung University, Taiwan.
2Department of Statistics, National Cheng Kung University, Taiwan.
3Division of Hepatogastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, National Cheng Kung University, Taiwan. Electronic address: [email protected].
Abstract
BACKGROUND & AIMS:
We investigated the rate of relapse of hepatitis B virus (HBV) infection after entecavir therapy for chronic hepatitis B and the association between level of hepatitis B surface antigen (HBsAg) and relapse.
METHODS:
In a retrospective study, we analyzed data from 252 patients with chronic HBV infection who were treated with entecavir and met the Asian Pacific Association for the Study of the Liver treatment stopping rules (mean time, 164±45 weeks), from January 2007 through June 2011 in Taiwan. Eighty-three were hepatitis B e antigen (HBeAg)-positive and 169 were HBeAg-negative. Patients had regular post-treatment follow-up examinations for at least 12 months. Virologic relapse was defined based on serum HBV-DNA >2000 IU/mL after entecavir therapy. Clinical relapse was defined as a level of alanine aminotransferase >2-fold the upper limit of normal and HBV-DNA>2000 IU/mL.
RESULTS:
Two years after therapy ended, 42% of HBeAg-positive patients had a virologic relapse and 37.6% had a clinical relapse; 3 years after therapy ended these rates were 64.3% and 51.6%, respectively. Based on Cox regression analysis, factors independently associated with virologic and clinical relapse included old age, HBV genotype C, and higher baseline levels of HBsAg for HBeAg-positive patients, and old age and higher end-of-treatment levels of HBsAg for HBeAg-negative patients. In HBeAg-positive patients, risk of HBV relapse increased with age ≥40 years and HBsAg level ≥1000 IU/mL at baseline (P<.001). In HBeAg-negative patients, the combination of age (<55 years) and HBsAg level (<150 IU/mL) at the end of treatment was associated with a lower rate of virologic relapse (4.5% of HBeAg-negative patients had viral relapse at year 3). The decreased in level of HBsAg from month 12 of treatment until the end of treatment was greater in patients who did lose HBsAg after entecavir therapy compared to those who did not.
CONCLUSIONS:
The combination of age and level of HBsAg are associated with relapse of HBV infection following treatment with entecavir. HBsAg levels might be used to guide the timing of cessation of entecavir treatment in patients with chronic HBV infection.
Copyright © 2015 AGA Institute. Published by Elsevier Inc. All rights reserved.
KEYWORDS:
drug; recurrence; reverse transcriptase inhibitor; treatment time
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