Clinical Significance of 7s IgM in Monoclonal IgM Diseases

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Abstract
The sera from 117 patients with diseases associated with a high production of monoclonal IgM were analysed for the presence of low molecular weight (7s) IgM by using a simple thin-layer Sephadex technique. 7s IgM was found in the sera of patients with myelomata (66%), lymphomata (45%), and Waldenström's macroglobulinaemia (20%), but was absent from the sera of patients with benign monoclonal macroglobulinaemia. This technique provides a cheap and practical test which may be valuable in selecting patients with lymphomata from those with benign lesions.

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