CXCR2 and neoplasm: CXCL5, a member of the proangiogenic subgroup of the CXC family, has been found to play a key role in tumor development and metastasis by interacting with its GPCR, CXCR2, and activating both the traditional EGFR and RSK1/2/AKT/ERK pathways, leading to phosphorylation of HSP27 (Heat Shock Protein) [112].