CCL8 and breast cancer: CCL8 in particular, or alternatively designated as monocyte chemotactic protein‐2 (MCP2), has been associated with the development of various cancers including breast cancer, by mechanisms involving the activation of tumor stroma and establishment of a gradient that favors dissemination of breast cancer cells, and the maintenance of a stem cell niche [4, 5, 6, 7, 8, 9, 10].