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The IL-23R region is associated with a number of non-infectious inflammatory conditions including inflammatory bowel disease, ankylosing spondylitis and psoriasis,1,–,3 and albeit with less consistent evidence, rheumatoid arthritis (RA).4,–,6 Association of rs1343151 (G→A) with RA, but not rs1004819/rs10489629/rs2201841, has been reported in European and New Zealand sample sets;5 none of rs3212227/rs6887695/rs7530511 was associated in European and North American sample sets,6 and rs7517847 was not associated in meta-analysed European and New Zealand sample sets.4 Given the immunological evidence pointing to the importance of the Th17–IL-23 axis in inflammation and autoimmunity,7 and the unresolved question of whether or not IL-23R is associated with RA, we further investigated association of IL-23R with RA in white European Caucasian case–control sample sets (cases ascertained …
Footnotes
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Funding The study was funded by Health Research Council of New Zealand.
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Competing interests None.
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Ethics approval The study was approved by the Madrid and Lugo hospital ethics committees, The Regional Committees for Research Ethics in Eastern and Southern Norway, Multi-region Ethics Committee and the Lower South Ethics Committee of New Zealand, the Lewisham Hospital and Guy's and St Thomas' Hospitals local research ethics committees, The Oxford Research Ethics Committee.
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Provenance and peer review Not commissioned; externally peer reviewed.