PMP22 and Guillain-Barre syndrome: In addition to IL8, and with the same rigorous statistical methods, we have identified six additional biomarkers that were upregulated in CSF in patients with GBS compared to HC (SELE, IL2RA, CR2, CD1C, THBD, and NRP1), and four compared with CIDP (ITGAM, IL2RA, IL6, and NRP1).