CD79A and rheumatoid arthritis: Despite its role in the pathophysiology of RA, a discrepancy in the data emerges, as shown by a clinical study, where it was shown that anti-Hsp90 antibodies increase in RA patients and correlate with an increase in the secretion of IFN-ɣ for anti-Hsp90 IgG and rheumatoid factor for anti-Hsp90 IgA [52].