The problem of proper diagnosis, patient's status and disease progression is very actual for autoimmune diseases. Still the diagnosis of Sjogren's syndrome is more state of art than of science. Our preliminary investigations showed that serum fibronectin of elevated molecular weight may be probably considered as one of the diagnostic criteria in Sjogren's syndrome patients. The increase of molecular weight of FN chains from 220 kDa to 250 kDa derives from relative and absolute elevation in a content of N-acetylglucosamine in FN carbohydrate chains. The present results concern the presence of FN in cryoprecipitates and circulating immune complexes in Sjogren's syndrome patients and as it has been demonstrated this parameter may be used as a prognostic sign.
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