CNTN1 and chronic inflammatory demyelinating polyradiculoneuropathy: Anti-CNTN1 (IgG4) was detected in 0.7% (n = 1500) [138], 0.8% (n = 342) [139], 6.5% (n = 46) [140], and 7.5% (n = 53) [141] of CIDP cases respectively.