DRB1*15 alleles strongly associate to anti-NF155+ CIDP providing genetic evidence to support the idea that the clinical, electrophysiological, pathological, and genetic heterogeneity of CIDP disappears when the disease is segregated according to highly specific biomarkers like anti-NF155 antibodies. The gene discussed is HLA-DRB1; the disease is chronic inflammatory demyelinating polyradiculoneuropathy.