(2) There is a strong correlation between AHR and CYP1B1 mRNA levels in the 60 breast cancer cell lines in the CCLE (r = 0.64; FDR < 4 × 10−7) and in 995 primary human breast cancers in The Cancer Genome Atlas (TCGA) (r = 0.27; FDR < 2.3 × 10−16) databases [17]. This evidence concerns the gene AHR and breast cancer.