Additionally, the SVM-RFE algorithm identified 4 specific genes (RPS7, CSTA, RPL22L1, and LY96) in the PsA cohort, as well as 4 genes (COX7C, RPL34, RPL22L1, and LY96) in the RA cohort (Fig 3E and 3F). Here, CSTA is linked to rheumatoid arthritis.