One study revealed the toxin Bl-LAAO from Bothrops leucurus venom presented a cytotoxic effect on the tumor cell lines MKN-45 (stomach cancer), RKO (colorectal cancer) and LL-24 (human fibroblasts), whereas around 25% of this cytotoxicity was inhibited in the presence of catalase (100 μg) [19]. This evidence concerns the gene CAT and neoplasm.