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Expression of CXCR4 in primary gastric tumors with or without lymph node invasion. CXCR4 mRNA level was detected by qRT-PCR in primary gastric cancers and its expression was analyzed in patients with or without lymph node invasion. 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
