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It was recently pointed out that rituximab (RTX) is effective against IgG4-related disease (IgG4-RD).1 We found that RTX is effective as an induction therapy for IgG4-RD in the short term, but that it is necessary to repeat the prescription of RTX. Furthermore, we had a patient who presented with resistance to RTX.2 After obtaining informed consent, we started the patient on abatacept (ABT) treatment. We have followed the patient for 8 months, and the patient presented with good response to ABT. This is the first report of the efficacy of ABT against IgG4-RD.
The patient was a 65-year-old Japanese woman who presented with IgG4-related dacryoadenitis and sialadenitis, and autoimmune pancreatitis. A submandibular gland biopsy specimen showed prominent infiltration of IgG4-bearing plasma cells (the ratio of IgG4/IgG-positive cells: 40%) with fibrosis and germinal centres (figure 1A, B). We diagnosed this case as IgG4-RD.3 She was initially treated with 40 mg/day of prednisolone, but several relapses occurred with tapering the dose to 10 mg/day. We administered ciclosporin A and mizoribine with steroid, …
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