Circulating surfactant protein -D is low and correlates negatively with systemic inflammation in early, untreated rheumatoid arthritis.
Christensen AF, Sørensen GL, Hørslev-Petersen K, Holmskov U, Lindegaard HM, Junker K, Hetland ML, Stengaard-Pedersen K, Jacobsen S, Lottenburger T, et al. Arthritis Res Ther. 2010; 12(2):R39. Epub 2010 Mar 8.