CAT and neoplasm: The two SNPs in catalase, an enzyme for detoxifying hydrogen peroxide into oxygen and water, revealed an association with initial tumor size: hetero- or homozygous T variant allele carriers at rs1001179 experienced a risk ratio (RR) of 2.59 (95% confidence interval 1.17–5.71, p = 0.017 by Fisher’s exact test) for having initial T4 tumors versus T2–T3 in comparison to individuals with the CC wildtype at this site.