OGG1 and rectal cancer: The adjusted ORs for the OGG1 Ser/Cys and Cys/Cys genotypes compared with the Ser/Ser genotype were not statistically significant (OR 1.28, 95%CI 0.55–2.99, p = 0.567 for colon cancer; OR 1.66, 95%CI 0.56–4.87, p = 0.359 for rectal cancer).