Our results demonstrate that OA ST (3.3 ± 0.9 pg/mg) and normal ST (3.4 ± 1.5 pg/mg) have comparable levels of IL-17, and that the levels of IL-17 were 3.5-fold increased (p < 0.05) in the RA ST (12.2 ± 3.2 pg/mg) (Figure 3). This evidence concerns the gene IL17A and rheumatoid arthritis.