CXCL1 and cancer: M2 macrophages secreted multiple soluble factors, such as fibroblast growth factor 2 (FGF2), growth-regulated oncogene-α (GROα), and macrophage colony-stimulating factor, which not only activated intracellular signals in cancer cells but also promoted laminin secretion by cancer-associated fibroblasts, leading to microenvironmental remodeling and cancer metastasis.