Other amyloidosis variants are related to chronic inflammatory diseases, like serum amyloid A protein amyloidosis (AA), or have a genetic background, being caused by hereditary or sporadic mutations in different genes encoding for soluble proteins, such as transthyretin amyloidosis (ATTR), fibrinogen amyloidosis (AFib), apolipoprotein A1 amyloidosis (AApo A1), gelsolin amyloidosis (AGel), cystatin C amyloidosis (ACys), and lysozyme amyloidosis (ALys), among others. Here, TTR is linked to amyloidosis.