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There is a well-recognised association of Down's syndrome with certain autoimmune diseases, in particular, thyroid autoimmunity, type 1 diabetes and coeliac disease. Recent publications have also reported an unexpectedly high prevalence of rheumatoid factor (RF) and anti-cyclic citrullinated peptide (CCP) antibodies.1 2 The recent identification of a potential susceptibility locus for rheumatoid arthritis (RA) at 21q22 in a genome-wide study3 further suggests the possibility of RA also being associated with trisomy 21.
Sera from 104 subjects with Down's syndrome, mean age 14.4 years (range 10–20), the Hester Adrian Research Centre population-based cohort, were obtained with informed consent and ethical …
Competing interests None.
Patient consent Obtained.
Ethics approval This study was conducted with the approval of the local research ethics committee.
Provenance and peer review Not commissioned; externally peer reviewed.
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