RT-PCR showed no significant difference in CD30 mRNA levels among the three groups (active ITP group vs. remission group, P = 0.143; active ITP group vs. controls, P = 0.059; and controls vs. remission group, P = 0.672, as shown in Figure 2). The gene discussed is TNFRSF8; the disease is autoimmune thrombocytopenic purpura.