Background and aim: We aimed to evaluate the effectiveness of pegylated interferon (Peg-IFN) monotherapy (IFN group) and combination therapy with tenofovir (TDF) and Peg-IFN (IFN+TDF group) in chronic hepatitis B (CHB) patients.
Patients and methods: Data of 143 CHB patients were analyzed in this study. All patients enrolled received liver biopsy. Virologic responses were defined as hepatitis B virus (HBV) DNA <100 IU/mL, biochemical responses were defined as normalization of alanine aminotransferse (ALT) levels, and HBeAg serological response was defined as
HBeAg loss or HBeAg seroconversion to HBeAb. HBsAg serological response was defined as HBsAg loss or HBsAg seroconversion to HBsAb.
Results: We observed that a total of 16.7% (11/66) and 33.8% (26/77) patients in IFN and IFN+TDF group achieved complete viral suppression after 48 weeks treatment (P =0.02). Although HBeAg levels in CHB patients in the IFN+TDF group decreased more rapidly during the 48-week treatment, we did not observe significant differences in HBeAg serological loss or seroconversion rates between the two groups at 24 and 48 weeks. HBsAg loss was observed in 13.0% (10/77) of CHB patients in the IFN+TDF group at 48 weeks, compared with only 3% (2/66) patients in the IFN group (P =0.032). No significant difference was observed in HBsAg seroconversion rate between the two groups during 48-week treatment. The biochemical response rate was also significantly higher in the IFN+TDF group than that in the IFN group at week 48 (P =0.015). Multivariate logistic analysis showed that IFN+TDF treatment (OR=4.41, P =0.003), severe baseline hepatic inflammation (OR=4.16, P <0.001), and lower baseline serum HBV DNA levels (OR=0.98, P =0.03) were strong predictors for the virological response. Younger age (OR=0.89, P =0.01), higher baseline ALT level (OR=1.01, P =0.038), and lower baseline HBeAg level (OR=0.99, P =0.008) were independent predictors for HBeAg sero-response after 48 weeks treatment. While only severe liver fibrosis (OR=1.69, P =0.028) and lower baseline HBsAg level (OR=0.22, P =0.005) were independent factors associated with HBsAg sero-response after 48 weeks treatment.
Conclusion: Peg-IFN combined with TDF may increase the virological response rate, biochemical response rate, and HBsAg loss rate in patients with CHB infection. The combination treatment is more suitable for those patients who are likely to respond to the treatment.
Keywords: hepatitis B, virological response, pegylated interferon, tenofovir