TGFB1 and neoplasm: The response of E‐cadherin‐RFP/Py2T cells in this respect is similar to the response of claudin‐low and triple‐negative breast cancer cells to TGFβ, which respond by exhibiting a pro‐stemness gene expression pattern, and in which TGFβ receptor antagonists effectively block mammosphere and tumour incidence [52, 53].