It is important not to confuse the immunologic process of autoimmune neuropathies (e.g., antibodies against contactin-associated protein 1 (Caspr1), contactin 1 (CNTN1), neurofascin (NF) 186, and NF155), anti-MAG neuropathy, polyneuropathy-organomegaly-endocrinopathy-M-protein-skin changes (POEMS) syndrome, and multifocal motor neuropathy (MMN) because they are not included as part of the CIDP syndrome [20,21]. This evidence concerns the gene CNTN1 and polyneuropathy.