JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Safety and efficacy of adefovir dipivoxil in patients co-infected with HIV-1 and lamivudine-resistant hepatitis B virus: an open-label pilot study.

Lancet 2001 September 2
BACKGROUND: Lamivudine-resistant hepatitis B virus (HBV) is found in about 15-32% of infected patients with or without co-infection with HIV-1 after 1 year of lamivudine therapy. Adefovir dipivoxil is active in vivo and in vitro against wild-type and lamivudine-resistant HBV. We assessed the safety and efficacy of a once daily dose of adefovir dipivoxil in an open-label trial for the treatment of lamivudine-resistant HBV infection in HIV-1-infected patients.

METHODS: 35 HIV-1/HBV co-infected patients receiving lamivudine therapy (150 mg twice daily) as part of their current HIV-1 antiretroviral regimen were enrolled. Patients received a 10 mg once-daily dose of adefovir dipivoxil for48 weeks while maintaining their existing anti-HIV-1 therapy, including lamivudine. Patients were assessed every 4 weeks for safety and efficacy.

FINDINGS: Four patients withdrew from the study (two because of adverse events), leaving 31 patients who received adefovir dipivoxil for a median of 48 weeks (range 44-48). Mean decreases in serum HBV DNA concentrations from baseline (log 8.64 copies/mL [SE log 0.08]) were 2log 3.40 copies/mL [log 0.12] at week 24 (n=31) and 2log 4.01 copies/mL [log 0.17] at week 48 (n=29; p<0.0001). Two patients underwent hepatitis B e antigen seroconversion-one at week 32 and one at week 36. Adefovir dipivoxil was generally well tolerated, but was associated with a transient increase in serum alanine aminotransferase concentrations in 15 patients. We found no significant changes in either HIV-1 RNA or CD4 cell count.

INTERPRETATION: These results indicate that 48 weeks of 10 mg daily adefovir dipivoxil is well tolerated and active against lamivudine-resistant HBV in HIV-1/HBV co-infected patients.

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