Abnormal expression of Th9/IL-9 and Th17/IL-17 was also observed in patients with active immune thrombocytopenia and those in remission, but there was no correlation between Th9 cells, IL-9, Th17 cells, IL-17, and platelet count (39). The gene discussed is IL17A; the disease is autoimmune thrombocytopenic purpura.