Among the many current studies of metabolic pathways and the metabolites in Hp induced chronic gastritis and cancer, Shi revealed that, in the serum samples of Hp infected patients, the activity of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px) is significantly lower while the malonaldehyde (MDA) level is higher relative to Hp negative patients [11]. This evidence concerns the gene HP and cancer.