FCGR2B and rheumatoid arthritis: Moreover, several studies have shown that the percentage of FcγRIII positive monocytes is increased in peripheral blood of RA patients [20,21] and that the expression levels of FcγRI, FcγRII and FcγRIII on RA monocytes are increased compared to healthy individuals [22-24], while FcγRIIb expression is unaffected [25].