CXCR4 and gastric cancer: In addition, both RhoE and CXCR4 expression were concordant in 83.3% (50/60) of gastric carcinomas specimens, the Spearman R correlation coefficient was 0.80 (P <0.001) and indicated a close correlation between both RhoE and CXCR4 expression in gastric cancers (Table 4).