Demonstration of an association between detection of IgG antibody reactivity towards the C-terminal region of the preS1 protein of hepatitis B virus and the capacity to respond to interferon therapy in chronic hepatitis B

Authors


  • Disclosure: Drs U Hellström and S Sylvan are named as inventors relating to the predictive marker filed by the Karolinska Innovations AB (KIAB). The others have no conflict of interest.

Dr Staffan Sylvan, Department of Communicable Disease Control and Prevention, S-751 85 Uppsala, Sweden. Email: staffan.sylvan@lul.se

Abstract

Background and Aim:  The treatment of hepatitis B virus (HBV) remains complex, with somewhat unpredictable responses. The aim of this study was to determine the predictive value of the pretreatment presence of circulatory antibodies towards a synthetic peptide mimicking the amino acids 94–117 of the preS1 protein of HBV and the capacity to respond to alpha-inteferon (IFN-alpha) treatment.

Methods:  The anti preS1(94–117) antibodies were measured by a peptide-based enzyme-linked immunosorbent assay (ELISA) and the response to INF-alpha therapy was judged by the effect on the viral kinetics as measured by an assay based on quantitative polymerase chain reaction during the treatment and follow up.

Results:  We found a significant (P < 0.001) correlation between the pretreatment presence of anti preS1(94–117) antibodies and a decrease in viral levels on follow up after the end of IFN-alpha therapy. The combined response of HBV DNA suppression (P < 0.001), hepatitis B e antigen (HBeAg) loss (P < 0.0001), anti-HBe seroconversion (P < 0.005) and AST aminotransferase normalization (P < 0.01) was also highly associated with the pretreatment presence of anti preS1(94–117) antibodies.

Conclusion:  The positive predictive value (PPV) of anti preS1(94–117) in determining a virological response was 83% and the negative predictive value (NPV) was 100%, indicating that in the absence of pretreatment anti preS1 reactivity virtually no patient has the capacity to respond to IFN-alpha therapy. Our findings may help to improve the efficacy of INF-alpha therapy for chronic hepatitis B (CHB) by guiding the selection of patients for treatment and optimizing the clinical management of the individual patient.

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