Moreover, even though it cannot be confirmed that cancer cells are not the only cell type that contributes to the expression of RSU-1 isoforms in the human samples, as other cells such as stromal cells, may also contribute at a smaller degree, these findings in human BC samples provide a clinical insight and corroborate our in vitro findings emphasizing the significance of RSU-1 in BC cell metastasis. Here, RSU1 is linked to breast cancer.