In a large cohort of CIDP patients, 3.2% were diagnosed with CMT (mostly mutations in PMP22, MPZ and GJB1).15 Although the coexistence of both conditions cannot be completely excluded, the evaluation of the family history alongside with the pace of disease progression and treatment response is helpful in differentiating. The gene discussed is GJB1; the disease is chronic inflammatory demyelinating polyradiculoneuropathy.