IL17A and Parkinson disease: After screening, Fms‐related tyrosine kinase 3 ligand (FLT‐3L), transforming growth factor‐alpha (TGF‐α), and tumor necrosis factor receptor superfamily member 9 (TNFRSF9) are associated with a low risk of PD, while IL‐17A is associated with a high risk of PD.