When the correlations of CSF cytokine/chemokine/growth factor levels with clinical severity were examined in NF155+ CIDP patients, only CCL3/MIP‐1α levels showed a weak positive correlation with Hughes functional grade scores (r = 0.3528, P = 0.0376), although CXCL8/IL‐8 levels tended toward a positive correlation with the scores (r = 0.2911, P = 0.0898) (Fig. 2A). This evidence concerns the gene CXCL8 and chronic inflammatory demyelinating polyradiculoneuropathy.