Hereditary transthyretin amyloidosis (ATTRv amyloidosis) is a rare and debilitating multisystem disorder resulting from the extracellular deposition of amyloid fibrils formed by a destabilized mutant form of transthyretin (TTR), a transport protein predominantly produced by the liver (1, 2). This evidence concerns the gene TTR and familial amyloid neuropathy.