Notably, CXCL7 was the only CXCL cytokine found in the CM from THP-1 monocytes (Fig. S1A), suggesting CXCL7 may be secreted by THP-1 cells and played a role in the crosstalk between monocytes and invasive breast cancer cells in the TME. This evidence concerns the gene PPBP and breast carcinoma.