KAT2A and rheumatoid arthritis: Considering the potential function of KAT2A in the pathogenesis of RA, we collected the peripheral blood mononuclear cell (PBMC) samples from health controls, stable RA (SRA) patients, active RA (ARA) patients, who fulfilled the diagnostic criteria given by American College of Rheumatology,17 and analyzed KAT2A mRNA expression.