No differences between RA patients and healthy controls were observed with regard to the frequency of Treg cells, ex vivo phenotype (CD4, CD25, CD127, CD39, or CD161), or proinflammatory cytokine profile (interleukin‐17 [IL‐17], interferon‐γ [IFNγ], or tumor necrosis factor [TNF]). This evidence concerns the gene IL17A and rheumatoid arthritis.