CCL2 and breast cancer: Our cytokine array analysis reveals that among the HIF‐1α‐regulated cytokines (CCL2, CCL5, CCL7, IL‐6, and VEGF),[18, 19, 20, 21] CCL2 secretion was significantly elevated in the CM from the mouse breast cancer cell line (4T1) cocultured with mouse ADSCs and the human breast cancer cell line (MDA‐MB‐231) cocultured with human ADSCs, compared to their respective monoculture‐derived CM controls (Figure 2D).