FABP4 and rheumatoid arthritis: As shown in Figures 1A–D, serum levels of Gal-9, sTIM-3, FAPB1, and FABP4 were significantly higher in RA patients (median 3.27 ng/mL, interquartile range [IQR] 2.72–4.87 ng/mL; 4.04 ng/mL, IQR 3.00–5.17; 1.87 ng/mL, IQR 0.66–4.23; 6.21 ng/mL, IQR 4.22–9.48, respectively) than in HC (1.24 ng/mL, IQR 1.00–1.29 ng/mL; 1.52 ng/mL, IQR 1.28–1.87 ng/mL; median 0.31 ng/mL, IQR 0.14–1.06; median 2.51 ng/mL, IQR 2.05–3.14, all p < 0.001, respectively).