LCAT and rheumatoid arthritis: The assessment of HDL functions, such as cell culture-based assays used in general [29], was not performed in these studies, although one study [12] showed a low concentration of serum lecithin-cholesterol acyltransferase (LCAT: seemingly one of the markers related to HDL functions) in patients with rheumatoid arthritis and the PON1 level to correlate with the LCAT level in these patients.