MONDO_0019471 (adult T-cell leukemia/lymphoma) is a peripheral (mature) T-cell neoplasm linked to the human T-cell leukemia virus type 1 (HTLV-1), adult T-cell leukemia/lymphoma is endemic in several regions of the world, in particular Japan, the Caribbean, and parts of Central Africa. Also known as: ATLL, T-cell leukaemia of adults, T-cell leukemia of adults, adult T-cell leukaemia, adult T-cell leukemia.