PPBP and breast cancer: Treatment of recombinant CXCL7 protein enhanced cell migration/invasion in MDA-MB-231 (Fig. 3A, B) and Hs578T breast cancer cells (Fig. S3A), while co-treatment with antibodies against CXCL7 largely reversed the induction of migration/invasion by CXCL7 in MDA-MB-231 cells (Fig. 3A, B).