For example, antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GPX) are all reduced in NSCLC in comparison with corresponding controls (Zalewska-Ziob et al., 2019), and glutathione (GSH) and its related enzymes that detoxify ROS, are increased in lung cancer (Luengo et al., 2019). This evidence concerns the gene CAT and lung cancer.