INCLUSION CRITERIA  Patients must meet all of the following inclusion criteria to be included in the study:  Major patient Protected adult patient (guardianship or curatorship)  Prospective Cohort:  Patients referred or who have been referred to the participating centre for suspected amyloidosis.  Patient who signed the patient information "Prospective Cohort" note  Retro-prospective Cohort:  Patient already followed in the center with a confirmed diagnosis of amyloidosis Patient who signed the "retro-prospective cohort" patient information note  Retrospective cohort:  Deceased patients followed in the center with a confirmed diagnosis of amyloidosis  Study participants will not be compensated for their participation  EXCLUSION CRITERIA The patient has expressed his/her refusal to participate Participation in another study, even an interventional one, is not a criterion for non-inclusion.