PPBP and breast cancer: This article summarizes existing knowledge about the roles of CXCL ELR-positive chemokines CXCL1, CXCL2, CXCL3, CXCL5, CXCL6, CXCL7, and CXCL8 as peripheral blood and tissue markers in the diagnosis and prognosis of women with breast cancer.