Background: Fibrinogen A alpha-chain (AFib) amyloidosis is an autosomal dominant disease with an endemic foci in the district of Braga, northern Portugal [1]. Among the 16 amyloidogenic mutations identified in the fibrinogen A alpha-chain gene (FGA) [2,3], the c.1634A > T (p.Glu545Val) mutation (rs121909612) is the most common and, so far, the only one identified in Portugal. A first study using three common po...