Snake venom l-amino acid oxidase (LAAO) have been studied for its anti-cancer potential through cytotoxic and apoptotic activity in various cancer cell lines including human promyelocytic leukemia cells (HL-60) [6,7,8], human T cell leukemia (jurkat) [8] human cervical adenocarcinoma (HeLa) [9,10], human lung adenocarcinoma (A549) [11], human breast adenocarcinoma (MCF-7) [12], human gastric and colon adenocarcinoma (MKN45 and RKO) [13], and Ehrlich ascites tumor cells [7]. Here, IL4I1 is linked to T-cell leukemia.