In an extensive analysis, comparing the study and control groups and, within the CIDP cohort, between DM+ and DM− patients, and between classical and atypical CIDP, no statistically significant differences were found in the concentrations of the assessed cytokines (TNF-α, IL-2, IL-18) in either serum or CSF. Here, TNF is linked to chronic inflammatory demyelinating polyradiculoneuropathy.