CXCR4 and neoplasm: The percentage of stroma in non-tumor tissue was lower than in tumor pancreatic tissue (32.4 ± 5.2 vs 67.4 ± 4.8; P-value = 0.001), and the level of CXCR4 protein expression in stromal cells was lower in non-tumor tissues and higher in tumor pancreatic tissues, with rates of positive expression of CXCR4 being 8.7 ± 4.6 and 23.5 ± 6.1, respectively (P-value = 0.022).