The serum netrin-1 expression level in patients with AML and nonhematological malignant diseases (immune thrombocytopenic purpura, IPT; iron-deficiency anemia, IDA, etc., control group) were detected using enzyme-linked immunosorbent assay (ELISA) (Figure 1). The gene discussed is NTN1; the disease is autoimmune thrombocytopenic purpura.