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We previously reported that a single-nucleotide variant (SNV) of\n                      <jats:italic>MUC5B<\/jats:italic>\n                      was associated with ILD in RA. However, the pathogenesis of ILD in Japanese patients with RA could not be explained solely by this SNV because its frequency is extremely low in the Japanese population. Here, we examined whether a different idiopathic pulmonary fibrosis susceptibility SNV might be associated with ILD in Japanese patients with RA.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Genotyping of rs2609255 (G\/T) in\n                      <jats:italic>FAM13A<\/jats:italic>\n                      was conducted in 208 patients with RA with ILD and 420 without chronic lung disease using TaqMan assays.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      A significant association with usual interstitial pneumonia (UIP) in RA was detected for rs2609255 under the allele model (p=0.0092,\n                      <jats:italic>P<\/jats:italic>\n                      c=0.0276, OR 1.53, 95% CI 1.12 to 2.11) and recessive model for the G allele (p=0.0003,\n                      <jats:italic>P<\/jats:italic>\n                      c=0.0009, OR 2.63, 95%\u2009CI 1.59 to 4.32).\n                      <jats:italic>FAM13A<\/jats:italic>\n                      rs2609255 was significantly associated with UIP in male patients with RA (p=0.0043, OR 3.65, 95%\u2009CI 1.52 to 8.73) under the recessive model.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>This study is the first to document an association of rs2609255 with ILD in Japanese patients with RA, implicating it in the pathogenesis of UIP, though studies on the function of rs2609255 are warranted.<\/jats:p>\n                  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