To determine the cytokine profile in patients with asthma, cytokine expressions, including IL-2, IL-4, IL-6, IL-10, IL-17A, IL-23, and TGF-β, in the peripheral blood cells of patients with asthma were measured, and it was found that the expression of IL-6, IL-17A, IL-23, and TGF-β was elevated, whereas that of IL-2 and IL-10 was decreased (Figure 2(a)). Here, IL17A is linked to asthma.