Meanwhile, in the case of AS patients, responders exhibited a higher disease activity (Bath Ankylosing Spondylitis Disease Activity Index [BASDAI] 6.75 vs. 6.08, p < 0.001; BASFI 4.47 vs. 3.45, p < 0.001), including erythrocyte sedimentation rate (ESR, 42.46 mm/h vs. 34.82 mm/h, p = 0.003) and C-reactive protein (CRP) level (2.77 mg/dL vs. 2.06 mg/dL, p = 0.007) than non-responders. Here, CRP is linked to ankylosing spondylitis.