What HLA occurs more commonly than expected in patients with inflammatory spinal arthritis associated with IBD

What HLA occurs more commonly than expected in patients with inflammatory spinal arthritis associated with IBD? 

HLA-B27 is found in 55% of CD patients and 70% of UC patients with inflammatory sacroiliitis or spondylitis. This contrasts with an 8% frequency of HLA-B27 in a normal, healthy, white population. Thus a patient with IBD who possesses the HLA-B27 gene has 7 to 10 times increased risk of developing inflammatory sacroiliitis or spondylitis compared with IBD patients who are HLA-B27 negative.

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