AHR and breast cancer: CPF induced cell proliferation in MCF-7 and MDA-MB-231cells after 1 and 14 days of treatment by AhR activation through thePGE2/Wnt/β-catenin pathway and HSP90 and HSP70 overexpression.Our results reveal new information on CPF toxic mechanisms inducedin human breast cancer cell lines, which could assist in elucidatingits involvement in breast cancer.