https://www.selleckchem.com/pr....oducts/sbc-115076.ht
Serologic testing for CTD was positive in 19 patients (43%) and most commonly included antinuclear antibody, rheumatoid factor, and anti-cyclic citrullinated antibodies. Seven of these patients with positive serologic results were eventually diagnosed to have CTD. Connective tissue diseases included rheumatoid arthritis in 4 patients, Sjögren syndrome in 2, and undifferentiated CTD in 1 patient. CONCLUSIONS Nearly one-half of patients with cryptogenic CB manifest positive CTD serology, and some of these patients have CTD not previous
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