CXCL13 and autoimmune thrombocytopenic purpura: As we expected, the CXCL13 levels in the ITP cohort were significantly increased by 2.3-fold compared to those in healthy controls (49.24 pg/ml [25.19-96.44] vs. 21.82 pg/ml [7.91-55.29], P = 0.0071; Figure 4), suggesting that chemokine CXCL13 was closely related with the occurrence of ITP.