In order to prove that lnc021545, miR-330-3p, and EREG conform to this regulatory mode to modulate the metastasis of BC, we proved that lnc021545 could combine with miR-330-3p to affect BC’s metastasis in previous experiments, and we still need to prove that miR-330-3p and EREG could combine and interact with each other. Here, EREG is linked to breast cancer.