CNTN1 and chronic inflammatory demyelinating polyradiculoneuropathy: Towards understanding the prevalence of anti-CNTN1 antibodies in CIDP patients, Mathey and colleagues performed ELISA on sera from 44 CIDP patients and found that three patients had anti-NF155 antibodies and a further three had anti-CNTN1 antibodies primarily of the IgG4 type [96].