The fact that both 4T1 and 67NR cells are highly expressing FN and assembling periFN [unpublished data], but only 4T1 cells characterized with pro-epithelial phenotypes are competent in forming macrometastasis foci in the lungs [338], implying that, although FNhigh 67NR cells are capable of attaching lung endothelia and form micrometastasis in the lung parenchyma, their pro-mesenchymal phenotypes render tumor dormancy and hamper macrometastatic outgrowth. Here, FN1 is linked to neoplasm.