Background & Aims: Biliary strictures occur in a third of patients with autoimmune pancreatitis and have been termed immunoglobulin G subclass 4 (IgG4) associated cholangitis (IAC). IAC often responds to steroid therapy. Methods: A patient with autoimmune pancreatitis and (IAC) refractory to steroids and 6-mercaptopurine was treated with rituximab, a monoclonal antibody directed against the CD20 antigen on B lymphocytes. Results: The patient's biliary strictures improved after rituximab therapy, permitting removal of his biliary stents. Systemic manifestations of IgG4-associated disease also improved. Conclusions: Rituximab may be a treatment option for patients with refractory or recurrent autoimmune pancreatitis or IAC.
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