CIDP-DM patients had higher CSF mean protein levels (91.83 vs. 78.16 mg%) and lower mean IL-2 levels (7.01 vs. 7.56 pg/mL) than CIDP patients without any other differences in the electrophysiological tests, lymphocytes distribution and cytokines levels. The gene discussed is IL2; the disease is chronic inflammatory demyelinating polyradiculoneuropathy.