Patients with PsA and RA treated with biologics had higher IHC reactivity in the early synovial tissue for TGF-β1 (p = 0.009), IL-17A (p = 0.016), and Dkk1 (p = 0.042) (Table 2 and Figure 1). Here, TGFB1 is linked to rheumatoid arthritis.