ABSTRACT
The natural history of hepatitis B virus (HBV) infection is complex and variable and
is greatly influenced by the age at infection, the level of HBV replication, and host
immune status. Chronic HBV infection generally consists of an early replicative phase
with active liver disease (hepatitis B e antigen [HBeAg]-positive chronic hepatitis)
and a late low or nonreplicative phase with HBeAg seroconversion and remission of
liver disease (inactive carrier state). After HBeAg seroconversion, some patients
may have active hepatitis due to HBV variants not expressing HBeAg (HBeAg-negative
chronic hepatitis). Morbidity and mortality are linked to development of cirrhosis
and hepatocellular carcinoma. Survival is reasonably good (about 85% probability at
5 years) in compensated cirrhosis but very poor in decompensated cirrhosis. Both cirrhotic
and noncirrhotic patients with sustained reduction of HBV replication and normalization
of aminotransferase after interferon alfa therapy have a reduced risk for liver-related
complications.
KEYWORDS
Hepatitis B virus - chronic hepatitis B - interferon alfa