CD40LG and rheumatoid arthritis: Although the concentrations of both sMer and sTyro were higher in RA than in controls, there were no correlations to disease parameters such as disease activity as measured by the disease activity score (DAS), the presence and level of rheumatoid factors of IgA, IgM, or IgG class or anti-cyclic citrullinated peptide antibodies (anti-CCP), or elevation of blood sedimentation rate.