The major factors in ADS are superoxide dismutases (SOD), catalase (CAT) and gluthathione peroxidase (GPX) (Hayes and McLellan, 1999; Mates and Sanchez-Jimenez, 2000; Ray and Husain, 2002; Townsend et al, 2003) Antioxidant enzymes can inhibit the initiation of carcinogenesis, affect tumour progression, and their expression is reduced in many types of cancerous cells (Oberley and Oberley, 1997; Li et al, 2000; Mates and Sanchez-Jimenez, 2000). The gene discussed is CAT; the disease is neoplasm.