CAT and gastric cancer: In order to demonstrate how S17 induces lethal ROS generation in gastric cancer cells, MGC803 cells were pretreated 1 h with the different functional ROS inhibitors include Catalase (CAT), ButyIhydroxyanisole (BHA), GKT137831 (GKT), Rotenone (ROT), Neohesperidin (NEO), and Apocynin (APO).