FAS and Guillain-Barre syndrome: The FAS -670 heterozygous AG variant (P = 0.0018, OR = 3.5, 95% CI = 1.6–7.6) and G allele (P = 0.0064, OR = 2.1, 95% CI = 1.2–3.5) were significantly more common among patients with the axonal subtype than the demyelinating subtype of GBS (Table 3).