At T24, fetuin-A was significantly lower in males (males 204.7 (180.1–245) vs. females 262.9 (232.5–285.7), p < 0.001), in patients who had elevated CRP or ESR at T0 (232.5 (186.5–259.2) vs. 261.1 (211.2–317), p = 0.04), and in patients with radiographic sacroiliitis at T0 (207.6 (182.5–246.5) in those with sacroiliitis vs. 261.1 (210.2–286.6) in those without, p = 0.03) (Table S3). This evidence concerns the gene CRP and Sacroiliac arthritis.