AHR and gastric cancer: The demonstration herein of 5F 203 activity against gastric cancer models expressing cytosolic AhR and inducible CYP1A1 and CYP2W1 suggests potential for the development of antitumour benzothiazoles for treatment of certain gastric cancers which pose a huge morbidity burden, represent an unmet clinical need, and for which there is currently no standard of care.