The association to PsA was observed in the presence of polymorphisms: TNF-238 G > A (rs361525), -308 G > A (rs1800629), and -857 C > T (rs1799724); IL12B C > G (rs6887695) and A > C (rs3212227); IL23A A > G (rs2066808) and IL23R G > A (rs11209026).
After correction for multiple testing with a false discovery rate of 5%, two SNPs remained significant: TNF (rs361525) was associated with PsO, PsC10, and PsA; and IL12B (rs6887695) was associated with PsO.
While <i>TNF</i>-308 (rs1800629) AA/GA, <i>IL17A</i> (rs2275913) AA/GA, and <i>IL17F</i> (rs763780) CC/TC genotype frequencies were associated, in the dominance inheritance model, with SpA and AS, regardless of gender, the presence of <i>HLA-B27</i>, <i>TNF</i>-238 (rs361525) GA/AA, <i>IL17A</i> (rs2275913) AA/GA, and <i>IL17F</i> (rs763780) genotypes was associated with PsA.