Furthermore, anti-MCV positivity was correlated with erythrocyte sedimentation rate (ESR) in AS patients, but no correlation with age, disease duration, C reactive protein (CRP), HLA-B27 status, smoking habits, pain intensity (VAS), Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), Bath Ankylosing Spondylitis Functional Index (BASFI) or Bath Ankylosing Spondylitis Metroloty Index (BASMI)(21). The gene discussed is CRP; the disease is spondylitis.