IL-1β indirectly induces motility in cancer cells through mesenchymal stem cells (MSC)-dependent release of chemokines such as CXCL1, 2, 3, 5, 6, 8, CCL2, 3, 5, and 20 suggesting correlation between interaction of these cells and the metastatic potential of the breast cancer cells [27]. Here, CCL2 is linked to cancer.