A Preliminary Assessment of Safety and Antiviral Activity of Open-label Entecavir in Subjects With Chronic Hepatitis B Following Monotherapy in Other Entecavir Trials

Key inclusion criteria:

• Age of 16 years and older
• Receipt of entecavir or lamivudine in a previous entecavir study.

Participants who were, based on their response to entecavir:

• Virologic nonresponders at Week 48

• Partial virologic responders who became nonresponders during the second year of treatment

• Partial virologic responders at Week 96

• Complete responders who relapsed during postdosing follow-up

  • Decompensated liver disease in AI463-048 that met 1 or more of the following criteria:

• Nonresponse to adefovir after at least 24 weeks of treatment

• Partial response to adefovir after 96 weeks of treatment

• Complete response to adefovir after relapsing during postdosing follow-up

• Demonstrated intolerance to adefovir

  • Except for those participants enrolled from AI463-048, compensated liver disease.

Key exclusion criteria:

• HIV coinfection
• Receiving nephrotoxic or hepatotoxic agents
• Ongoing opportunistic infections
• Hemoglobin level <11.0 g/dL except for those enrolled from AI463-048
• Platelet count <70,000 mm^3 except for those enrolled from AI463-048
• Absolute granulocyte count <1,500 cells/mm^3
• Recent history of pancreatitis (within 24 weeks prior to first dose of therapy)
• Current evidence of ascites requiring paracentesis, hepatic encephalopathy, or variceal bleeding, except for those enrolled from AI463-048
• Known history of allergy to nucleoside analogues.

History of severe allergic reactions to study medication Currently pregnant or breastfeeding Recent participation in another clinical trial within the last 30 days Presence of uncontrolled medical conditions that could affect safety