[Study on the relationship between hepatitis B virus genotypes and the effect of polyethylene glycol-interferon-alpha therapy on HBeAg-positive chronic hepatitis B].

OBJECTIVE

To investigate the efficacy of polyethylene glycol (PEG)-interferon α (PEG-IFNα) in treating HBeAg-positive chronic hepatitis B (CHB) and explore the relationship between hepatitis B virus (HBV) genotypes and the effect of interferon α (IFNα) therapy.

METHODS

A total of 199 CHB patients with known genotypes were given subcutaneous injection of PEG-IFNα-2a or PEG-IFNα-2b once a week for 48 weeks, with another 24 weeks follow up. The seroconversion of HBeAg influenced by HBV genotypes were analyzed after discontinuation of treatment.

RESULTS

In local area, genotype C was the major genotype [64.32% (128/199) ]. Except serum ALT and AST level, the differences in gender, age, liver inflammation, degree of liver fibrosis, HBeAg level and HBV DNA level between genotype B and C were not statistically significant (all P > 0.05). The seroconversion rate of HBeAg in patients with genotype B at early stage of therapy (3 months) was significantly higher than that of patients with genotype C [26.76% (19/71) vs 10.16% (13/128), χ(2) = 9.330, P = 0.002]. While at the end of follow-up, seroconversion rate of HBeAg in patients with genotype B (followed up for 6 months) was higher than that of patients with genotype C [39.44% (28/71) vs 30.47% (39/128)], but the difference was not statistically significant (χ(2) = 1.645, P = 0.200). By univariate analysis based on log-rank test, the time of HBeAg seroconversion in patients with genotype B was much earlier than that of genotype C [(13.99 ± 0.67) months vs (15.47 ± 0.41) months], but the difference was not statistically significant (P = 0.150).

CONCLUSIONS

The seroconversion rate of HBeAg in patients with genotype B treated with PEG-IFNα was significantly higher than that of genotype C in early stage of therapy (3 months), while similar at the end of therapy.