NQO1 and gastric cancer: The treatment of polysaccharides at a high dose of 9.6 g/kg could protect against the precancerous lesions of gastric cancer (PLGC) in rats by activating the Nrf2 pathway and its downstream antioxidant enzymes like heme oxygenase 1 (HO-1) and NAD(P)H: quinone oxidoreductase-1 (NQO-1).