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.