CXCL5 and gastric cancer: 5-FU-sensitive gastric cancer cells were cultured alone or co-cultured with MR macrophages with the presence of rhCXCL5 (10 ng/ml) or CXCL5 neutralizing antibody (0.5 μg/ml) for 48 h followed by being treated with 15 μg/ml 5-FU for 24 h, then the rates of apoptosis were analyzed.