Primary cutaneous B cell lymphomas have a high recurrence rate after treatment with surgery and/or local radiation therapy. Two men are described in whom radiotherapy-relapsing cutaneous B-cell lymphomas were successfully treated with the monoclonal anti-CD20 antibody rituximab. Both patients had a complete response with no recurrence at follow-up at 17 and 24 months for the large B-cell lymphoma of the leg and the follicle centre cell lymphoma, respectively. These are two of the few cases in the literature showing that rituximab is an effective and well-tolerated treatment for radiotherapy-relapsing primary cutaneous B cell lymphoma.
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