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CXCR4 expression is higher in later stages of gastric patients. CXCR4 mRNA levels were detected by qRT-PCR in primary gastric cancers and its levels were correlated with the clinical staging of gastric cancer. CXCR4 expression was normalized to endogenous β-actin and its relative expression was determined by comparative CT method as described in materials and methods. Data are expressed as mean ± SD; P < 0.05; ns: non-significant
