In this report, we describe a case of a 48-year-old Japanese woman who is a hepatitis B (HB) carrier with rheumatoid arthritis (RA). She had the following antibody profile: HBs Ag(+), HBs Ab(-), HBe Ag(-), HBe Ab (+), HBc Ab(-) and undetectable HBV-DNA level. She was treated with auranofin, salazosulfapyridine, and bucillamine. Finally, she was treated with D: -penicillamine, but her disease activity remained elevated. Prophylactic treatment of entecavir 0.5 mg daily was started in March 2008 and all disease-modifying anti-rheumatic drugs were stopped. After 2 weeks, etanercept monotherapy was started at 25 mg subcutaneously once a week. Significant improvement in clinical parameters of disease activity and well being was observed. Serum alanine aminotransferase (ALT), serum aspartate aminotransferase (AST), and HB virus viral load did not change significantly. Serum ALT, AST, and HB virus viral load were followed-up at every 3-month intervals, from initiation of therapy up to 24 months after the start of treatment with etanercept. We have also summarized the course of nine RA patients who received etanercept and were HB carriers or had chronic HB according to our literature search. Based on the results of our study, treatment of these patients with etanercept co-administered with lamivudine or entecavir appears to be safe.
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