Based on the postulated role of the chicken CYP2A homolog in the sensitivity toward AFB1, the importance of CYP2A6 in the toxicology of AFB1 in humans and animals, and its genetic implication in hepatic cellular cancer (HCC), lung cancer, colorectal cancer etc., we hypothesize that the broilers has the homologue of human CYP2A6 that may bioactivate AFB1. This evidence concerns the gene CYP2A6 and lung carcinoma.