FASLG and Guillain-Barre syndrome: The median serum levels of sFas (237.5 pg/mL vs. 159.5 pg/mL; P < 0.0001) and sFasL (225.1 pg/mL vs. 183.4 pg/mL; P = 0.0069) were significantly higher in patients with GBS than healthy controls (“Fig 1” and “S1 File”).