AHR and lung cancer: Similar contradictory effects of AHR on cell cycle progression were also observed in human lung cancer cells [97]. The impact of exposure to mixtures of 2-methyl-1,3-butadiene, carbon tetrachloride, TCDD, and BaP on this pathway may contribute to the development of breast and or lung cancer as these hydrocarbons interacted with CDKN1B gene (Suppl Table 2).