Thus, the abnormal VEP frequency of 76.9% in the present NF155+ CIDP series is higher than the reported abnormal VEP frequencies in total CIDP patients,29, 30, 31 which mostly reflects NF155‐ CIDP cases, given the low frequency of NF155+ CIDP in Caucasians.24, 25, 26. This evidence concerns the gene PMP22 and chronic inflammatory demyelinating polyradiculoneuropathy.