We did not include the 8 patients with ATTRv-PN and an additional etiology for polyneuropathy because this could have influenced the clinical phenotype (n = 1 alcohol abuse, n = 2 vitamin B12 deficiency, n = 1 AL-amyloidosis, n = 3 diabetes mellitus, n = 1 IgM MGUS/anti-MAG related polyneuropathy). Misdiagnosis occurred in 4 patients withATTRv-PN; misdiagnosis included wild-type amyloidosis (n = 1), CIAP with benign fasciculation syndrome (n = 1), and CIDP (n = 2). The gene discussed is MAG; the disease is vitamin B12 deficiency.