Previous results from our research group have demonstrated that the antitumor effect of compounds of the 2-(4-amino-3-methylphenyl) benzothiazole group (DF 203, NSC 674495; 5F 203, NSC 703786) (Figure 2) is mediated by AhR in MCF-7 breast tumor cells [15, 17, 21]. Here, AHR is linked to breast neoplasm.