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J Rheumatol. 1985 Jun;12(3):553-7.

Complementation with HLA-A and HLA-D locus alleles in ankylosing spondylitis with peripheral arthritis.


Fifty-nine patients with HLA-B27 positive ankylosing spondylitis were HLA genotyped to look for immunogenetic differences between patients with associated peripheral arthritis and those with disease limited to the axial skeleton. An association was found between the peripheral arthropathy and 2 antigens, HLA-A11 and HLA-DR7 at the p less than 0.05 level. Complementation between these 2 alleles and HLA-B27 occurred in both the cis and trans positions. Four patients with peripheral arthritis had a rare HLA-B27 haplotype (HLA-B27, HLA-DR7) which was not found in the group with axial disease alone.

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