Quercetin shows antioxidant activity at a concentration of 10 μmol/l in HepG2 cells, inhibiting oxidative stress promoted by H2O2; promotes an increase in superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-PX); and reduces lipid peroxidation in rats with chronic prostatitis/chronic pelvic pain syndrome by anti-inflammatory and antioxidative activities through down-regulating nuclear factor kappa (NF-kB) and mitogen-activated protein kinase (MAPK) signalling pathways (Meng et al. 2018). This evidence concerns the gene CAT and chronic prostatitis.