Phyh (peroxisomal phytanoyl-CoA dioxygenase) regulates peroxisomal fatty acid β-oxidation metabolism and ROS conversion (105); its concentration positively correlates with potential tumour suppressive environment (106, 107), working synergistically with iNOS induced by Stat1, which may trigger the recruitment of CTLs (108, 109). The gene discussed is PHYH; the disease is neoplasm.