TNF and Guillain-Barre syndrome: We found that the concentrations of plasma IL-37 were correlated positively with the levels of plasma IL-17A, IFN-γ, and TNF-α in GBS patients (Figure 3, R = 0.4558 and P = 0.022; R = 0.4969 and P = 0.0115; R = 0.4661 and P = 0.0188, resp).