[Adult T-cell leukemia with massive melena due to marked gastrointestinal involvement].

A 60-year-old man born in Okinawa was admitted to our hospital because of epigastralgia. Physical examination revealed general lymphadenopathy, mild hepatomegaly and skin eruption. The peripheral blood leukocyte count was 168,600/microliters, with 93% abnormal lymphocytes showing convoluted or lobulated nuclei. Anti HTLV-1 antibody was positive with titer of 1: 1280 (PA). Leukemic cells had typical ATL cells' surface markers (OKT3; 97.2%, T4; 93.3%, T8; 2.8%, OKIA1; 39.6%, IL-2R; 41.8%) and complete monoclonal HTLV-1 provirus DNA. Endoscopic examination with biopsy revealed massive involvement of ATL cells into gastric mucosa. In the course of the treatment, he had extremely massive melena, and was saved by emergency operation. Multiple ulcers were found in the resected colon. Histological examination showed the marked infiltration of the ATL cells into the mucous or submucous membrane. Thereafter, he was treated well with ALG (Anti Lymphocyte Globulin), until hypercalcemia occurred. He died of acute renal failure after hypercalcemia.