Serum thrombomodulin

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Abstract
Objective. Soluble thrombomodulin (sTM), a proposed serum marker of endothelial cell injury, was investigated as a parameter of disease activity in patients with systemic lupus erythematosus (SLE). Methods. Levels of sTM were determined by enzyme-linked immunosorbent assay. Disease activity was assessed using 3 established scoring systems: the American College of Rheumatology (ACR), the New York Hospital for Special Surgery (NYHSS), and the Systemic Lupus Activity Measure (SLAM) systems. Results. A close correlation was found between sTM levels and disease activity as assessed with all 3 scoring systems: r = 0.52 by the ACR, 0.75 by the NYHSS, and 0.82 by the SLAM. Conclusion. We found that sTM is a sensitive serologic marker of organ involvement in patients with SLE. Furthermore, sTM may prove to be an important marker for vasculitis in general.