CD40LG and rheumatoid arthritis: Experimental results from feature selection indicated that IgM anti-HPT78−108 HNE (HC vs. RA 0.3496, OA vs. RA 0.3496), IgM anti-IGKC2−19(HC vs. RA 0.2967), and IgM anti-IGKC2−19 HNE (HC vs. RA 0.2921) showed discriminative power in identifying RA patients from HC and OA patients (Table 5).