Some of the 25 biomarkers, such as phospholipase B1 (PLB1) (33), discoidin receptor 2 (DDR2) (34), and psoriasis susceptibility 1 candidate 1(PSORS1C1) (35), have been identified as biomarkers and participate in the pathogenesis of RA. Here, PLB1 is linked to rheumatoid arthritis.