CRP and ankylosing spondylitis: Correlation analysis suggested that the expression levels of hsa_circ_0000652 were statistically correlated with the Ankylosing Spondylitis Disease Activity Score (ASDASCRP), Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), and level of C-reactive protein (Figures 2C–E, p < 0.001).