Prevalence of hepatitis B virus genotype B in Vietnamese patients with chronic hepatitis B |
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Authors: | Long H Nguyen Nghiem B Ha Philip Vutien Nghi B Ha Ruel T Garcia Huy N Trinh Brian S Levitt Huy A Nguyen Khanh K Nguyen Emmet B Keeffe Mindie H Nguyen |
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Institution: | (1) School of Medicine, Stanford University, Stanford, CA, USA;(2) Pacific Health Foundation, San Jose, CA, USA;(3) San Jose Gastroenterology, San Jose, CA, USA;(4) Division of Gastroenterology and Hepatology, Stanford University Medical Center, Stanford, CA, USA |
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Abstract: | Purpose Hepatitis B virus (HBV) genotypes can affect treatment response to interferon-based therapy and disease outcomes in patients
with chronic hepatitis B (CHB). Little data exist to characterize HBV genotypes in Vietnamese, one of the largest minority
groups in the United States and also one with one of the highest CHB and liver cancer disease burdens. The goal of this study
was to compare the distribution of HBV genotypes in Vietnamese and Chinese patients.
Methods We performed a cross-sectional study of 567 consecutive patients of Vietnamese (n = 478) or Chinese (n = 89) descent, with HBV genotype mutation analysis performed between 7/2,005 and 6/2,008 at a community gastroenterology
clinic and a university-affiliated liver clinic in the United States.
Results There were no significant differences between the Vietnamese and Chinese groups in mean age (45 and 44 years), gender (58%
and 61% male), HBeAg status (64% and 65% negative), median alanine aminotransferase (33 and 41 U/L), and log10 HBV DNA (4.9 and 5.0 log10 IU/ml), or the prevalence of precore/basic core promoter mutations (72% and 71%), respectively. Vietnamese patients had a
much higher prevalence of HBV genotype B and a lower prevalence of genotype C than Chinese patients: 74% and 25% vs. 55% and
43% (P = 0.001).
Conclusions Chinese patients with CHB often carry either B or C genotype. Vietnamese patients with CHB mostly have HBV genotype B. Additional
studies are needed to further characterize the clinical significance of HBV genotype in the natural history and treatment
outcomes of CHB in Vietnamese patients. |
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Keywords: | Epidemiology Asian HBV |
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