AHR and cancer: Cytoprotective effects of Nrf2 against oxidative stress are related to the presence of a functional aryl hydrocarbon receptor (AhR), a transcription factor that display pleiotropic activity in the context of carcinogenesis [13] and while some AhR ligands can suppress senescence acting as tumor promoters [268], recent work suggests that Ahr gene can function as a tumor suppressor gene by inhibiting cell proliferation and promoting senescent-like phenotype thus counteracting cancer progression [269–271].