Hypertrophic osteoarthropathy, cutaneous vasculitis, and mixed‐type cryoglobulinemia in a patient with nasopharyngeal carcinoma

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Abstract
We describe a 27‐year‐old woman with a primary nasopharyngeal carcinoma who developed hypertrophic osteoarthropathy and cutaneous vasculitis. Her serum contained antibodies to Epstein‐Barr virus and U1 RNP antigens. Cryoproteins isolated from her serum contained antibodies to U1 RNP and a protein with a molecular weight of 32 kd which reacted specifically with antibodies to U1 RNP. HLA typing revealed HLA‐B7 and DR1; these have been reported to be increased in Japanese patients with rheumatic diseases who have autoantibodies to U1 RNP. These findings indicate that some features of the paraneoplastic syndrome in this patient might have been caused by immune complexes, part of which were formed by specific autoantibodies produced under genetically controlled conditions of immune responsiveness.