To rule out the possibility that the acquisition of the epithelial phenotype in the fibroblasts was an effect due to BRCA1 knock-out, rather than an effect secondary to horizontal transfer of cancer mRNA, we analyzed the expression of SNAI1, SNAI2, ZEB1, ZEB2, CDH2, vimentin, fibronectin, and CDH1 in naïve fibroblasts. Here, CDH1 is linked to cancer.