Revisiting the natural history of chronic hepatitis B: impact of new concepts on clinical management.

Appropriate treatment for chronic hepatitis B (CHB) to prevent disease progression and clinical complications requires an accurate knowledge of the natural history of this disorder. In patients who acquire the disease in early life, as is the situation in Asian CHB patients, complications of CHB continue to develop because of the prolonged insidious damage to the liver, even in the low viremic phase. Hepatitis B e antigen seroconversion with hepatitis B virus (HBV) DNA levels just below 10(5) copies/mL may not be an adequate treatment endpoint for Asian CHB patients. Furthermore, it has been shown that patients with mild elevation of alanine aminotransferase (ALT) levels are already at considerable risk of development of complications. More recent studies have shown that in order to move towards a better disease outcome, CHB patients should have HBV DNA levels at least less than 10(3) copies/mL, with ALT levels preferably in the range of less than 0.5 times the upper limit of the normal range. Therefore, prolonged, adequate suppression of viral replication should be the practical goal for the treatment of CHB disease in the Asian population.