Abstract

BACKGROUND:

The glycosphingolipid alpha-galactosylceramide (alpha-GalCer) is known to stimulate invariant natural killer T-cells (iNKTs) and is able to induce powerful antiviral immune responses. The present dose-escalating randomized placebo-controlled Phase I/II trial aimed to investigate antiviral activity and safety of alpha-GalCer as a novel class of treatment for chronic hepatitis B patients.

METHODS:

Patients were randomly assigned to 0.1 microg/kg (n=8), 1 microg/kg (n=6) or 10 microg/kg (n=6) alpha-GalCer or placebo (n=7) treatment.

RESULTS:

Almost all alpha-GalCer-treated patients showed a rapid and strong decrease in natural killer T-cell (NKT) numbers. Patients with high baseline NKT numbers showed immune activation, including natural killer cell activation, increased serum tumour necrosis factor-alpha and interleukin-6 levels, and development of fever. Three patients demonstrated a transient decrease in hepatitis B virus (HBV) DNA. Only one alpha-GalCer-treated patient had a sustained decrease in HBV DNA at the end of follow-up. Four patients discontinued therapy because of fever shortly after drug administration. No significant side effects were observed.

CONCLUSIONS:

alpha-GalCer (0.1-10 microg/kg) used as monotherapy for chronic hepatitis B infection resulted in a strong decrease of NKTs, but did not clearly affect HBV DNA and alanine aminotransferase levels. alpha-GalCer was poorly tolerated and is unlikely to be suitable as an alternative monotherapy to the current treatment regimen.