Several chemokines are elevated in the plasma and serum of vasculitis patients and are correlated with disease activity (AAV: CCL17 (61), CCL18 (62), CCL20 (63), CXCL8-11 (4), CX3CL1 (64), and XCL1 (65); TD: CCL2 (66) and CCL5 (67); GCA: CCL2 (67), CXCL9-11 (68) and CX3CL1 (69); and KD: CCL17 (70) and CXCL9/10 (70), (71)). The gene discussed is CCL17; the disease is vasculitis.