As the RMECs from mammary carcinomas also express higher levels of Integrin α6 (CD49f), which is a marker previously associated with MaSCs [10], show increased proliferation, and show increased pFAK expression that was also found be associated with a stem-progenitor cell pool [20], we hypothesize that DMBA- and MNU-induced mammary carcinomas may have an increased pool of stem/progenitor-like cells driving tumorigenesis. This evidence concerns the gene ITGA6 and breast carcinoma.