TTR and amyloidosis: Transthyretin amyloidosis (ATTR) is the most common type of autosomal-dominant hereditary systemic amyloidosis associated with the transthyretin (TTR) protein; with either early- or late-onset presentation in patients (Benson and Kincaid, 2007; Plante-Bordeneuve and Said, 2011; Adams et al., 2012).