We plan to select those centres within the EBMT that in the past have performed any allogeneic transplant for amyloidosis and ask them to participate by completing a centre registration form. When they have a patient they want to include in this study, the centre will notify the CLWP data office of the planned allogeneic transplant the day before the transplant takes place. For this, the centre can use a patient registration form. Once a patient is included, MED B and regular follow-up are mandatory. Data entry of MED B forms and follow up will be performed in the way that is usual for the centre (either by the centre itself, by the national registry or by the Paris data office). The CLWP data office will keep track of the data submitted.