Colorectal cancer (CRC) is believed to be related to the intake of processed meat and the formed heterocyclic aromatic amines (HCA) herein, which are metabolically activated by the enzymes cytochrome P4501A2 (CYP1A2) and N-acetyltransferase 2 (NAT2). The influence of genotypic and phenotypic variations for CYP1A2 and NAT2 on the risk for colorectal adenomas was investigated in 94 individuals at different risk of developing CRC. Significant associations were found between the CYP1A2-164A-->C polymorphism (CYP1A2*1F) and the risk of colorectal adenomas, suggesting that the studied polymorphism plays an important role in CRC risk in humans.
Moonen, H., Engels, L., Kleinjans, J., & de Kok, T. (2005). The CYP1A2-164A-->C polymorphism (CYP1A2*1F) is associated with the risk for colorectal adenomas in humans. Cancer Letters, 229(1), 25-31. https://doi.org/10.1016/j.canlet.2004.12.010