We found higher levels of CXCL13 in the sera of CIDP (71.41 ± 5.83 pg/mL, p < 0.01) and AIDP (71.34 ± 13.73 pg/mL, p < 0.05) patients compared with those in the control sera (37.35 ± 6.75 pg/mL). The gene discussed is CXCL13; the disease is Guillain-Barre syndrome, familial.