Supporting these data, independent analysis of the GSE183947 publicly available human breast cancer data set (https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE183947) revealed a significant positive correlation between IL-6 and CCL2 transcript levels in breast cancer metastasis compared with primary tumors (primary tumors [r = 0.24, P = 0.383] versus metastasis [r = 0.64, P = 0.0009]; Supplemental Figure 8B). Here, CCL2 is linked to breast cancer.