Objective To study the correlation between the single nucleotide polymorphism( SNP) of rs7517847 on IL-23 R gene and the susceptibility of ankylosing spondylitis. Method IL-23 R gene polymorphisms of 100 cases with ankylosing spondylitis( AS) were detected by polymerase chain reaction-restriction fragment length polymorphism( PCR-RFLP) and compared with 35 healthy people in the control group. Results The distribution difference in the genetype and allele frequency of rs7517847 between AS group and the contr...