This cluster of papers focuses on Guillain-Barré syndrome and related neuropathies, including chronic inflammatory demyelinating polyradiculoneuropathy. It covers the pathogenesis, diagnosis, treatment, and prognosis of these neurological disorders, with a particular emphasis on the role of intravenous immunoglobulin therapy. The cluster also explores the autoimmune nature of these neuropathies and their association with specific antibodies and infections.