Abbreviations: AHT = arterial hypertension, BASDAI = Bath Ankylosing Spondylitis Disease Activity Index, BASFI = Bath Ankylosing Spondylitis Functional Index, CRP = C-reactive protein, DM2 = type 2 diabetes mellitus, ESR = erythrocyte sedimentation rate, HLA = human leukocyte antigen, MRI = magnetic resonance imaging, NSAIDs = non-steroidal anti-inflammatory drugs, SpA = spondyloarthritis, SD = standard deviation. This evidence concerns the gene CRP and diabetes mellitus.