The etiology for polyneuropathy included chronic inflammatory demyelinating polyneuropathy (CIDP) (16), Charcot–Marie–Tooth disease (CMT) (8), idiopathic (4), diabetes (2), chemotherapy (2), prediabetes (1), anti-myelin associated glycoprotein (MAG) (1), systemic lupus erythematosus (SLE) (1), and small fiber neuropathy (1). This evidence concerns the gene MAG and diabetes mellitus.