TITLE: Quantitative Hepatitis B Surface Antigen Kinetics In Entecavir Treated Patients |
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AUTHORS (FIRST NAME, LAST NAME): Ju Yeon Cho1, Yong Han Paik1, Won Sohn1, Seon Woo Kim2, Sook Young Woo2, Geum-Youn Gwak1, Moon Seok Choi1, Joon Hyeok Lee1, Kwang Cheol Koh1, Seung Woon Paik1, Byung Chul Yoo1 |
Institutional Author(s): |
INSTITUTIONS (ALL): 1. Medicine, Samsung Medical Center, Seoul, Korea, Republic of.
2. Biostatistics, Samsung Medical Center, Seoul, Korea, Republic of.
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ABSTRACT BODY: Background: Hepatitis B surface antigen (HBsAg) loss is associated with immunological control of the hepatitis B virus and durable suppression of viral replication. HBsAg levels reflect transcription of closed covalent circular DNA in patients with chronic hepatitis B (CHB). The aim of this study was to investigate the on-treatment kinetics of quantitative HBsAg during entecavir therapy to predict the treatment period needed to achieve HBsAg seroconversion.
Methods: From a cohort of 1006 CHB treatment-naïve patients who were started on entecavir, 425 patients with a quantitative HBsAg value after initiation of entecavir were selected. Among the patients, 321 patients (75.1%) had more than 2 serial samples. The kinetics of quantitative HBsAg decline was assessed using 1465 samples from 413 patients with normal distribution and homoscedasticity with mixed linear model to predict the time to clear HBsAg while on entecavir treatment.
Results: Among the 413 patients, 213 patients (51.6%) were HBeAg positive and 200 patients (48.4%) were HBeAg negative. At baseline, the age of the HBeAg(-) group was significantly older (p < 0.001) and the level of HBV-DNA was significantly lower (p < 0.001) compared to the HBeAg (+) group. During a median follow up of 49.5 months, the quantitative HBsAg level showed a slow but consistent decrease in value regardless of the HBeAg status. The HBeAg-positive group had a mean slope of -0.0036 ± 0.0003 Log10 IU/month (p<0.001) and the HBeAg-negative group had a mean slope of -0.0037 ± 0.0004 Log10 IU/month (p<0.001). The calculated time to clear quantitative HBsAg in HBeAg-positive and HBeAg-negative groups were 87 years and 73 years, respectively.
Conclusions: Analysis of the kinetics for HBsAg level during entecavir therapy suggests the treatment period required to achieve quantitative HBsAg clearance during entecavir therapy is life-long, regardless of the HBeAg status of chronic hepatitis B patients.
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Co-Author Disclosure Status |
The following authors have completed their AASLD 2013 disclosure: Ju Yeon Cho: Disclosure completed | Yong Han Paik: Disclosure completed | Won Sohn: Disclosure completed | Seon Woo Kim: No Answer. | Sook Young Woo: No Answer. | Geum-Youn Gwak: Disclosure completed | Moon Seok Choi: Disclosure completed | Joon Hyeok Lee: Disclosure completed | Kwang Cheol Koh: No Answer. | Seung Woon Paik: Disclosure completed | Byung Chul Yoo: Disclosure completed |