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The correlations between the expression of nm23H1 mRNA,VEGF-C mRNA, VEGFR-3 and neoangiogenesis, hyperplasia of micro-lymphatic, tumor metastases in gastric cancer were studied, the results supplied an experimental foundation for clinical treatment and prognosis. All the specimens were marked by VEGFR-3 antibody, the expressions of nm23H1 mRNA, VEGF-C mRNA were detected in 78 cases of gastric cancer in situ hybridization with EnVision and Leica-Qwin computer image analysis system. The Weidner's highest vessel density counting method was used to analyse micro-lymphatics count (MLC) of the specimens, and the patients' viability after operation was investigated. The positive expression of nm23H1 mRNA in gastric cancer was 69.23% (54 cases). There was negative correlation between the positive expression of nm23H1 mRNA and lymph node metastasizing, TNM staging, MLC (P < 0.01 or P < 0.05). The expression of VEGF-C mRNA was 46.15% (36 cases). It was positive related to the lymph node metastasis, TNM stages, MLC in gastric cancer (P < 0.01 or P < 0.05), and was significantly different compared with adjacent nontumorous tissue (P < 0.01 or 0.05). The expression of nm23H1 in stage I and II gastric cancer was high, while in stage III and IV the expression was lower or even none. The MLC (8.37 +/- 2.29/mm2) in gastric cancer was higher than that in adjacent nontumorous tissue (4.82 +/- 3.48/mm2), which has statistical significance (P < 0.05). There was negative correlation between the expression of nm23H1 mRNA and VEGFR-3 (p < 0.05, r = 0.8479), but positive correlation between VEGF-C mRNA and VEGFR-3 (P < 0.05, r = 0.8362). The MLC (10.82 +/- 2.51/mm2) in those who died in five years (48 cases) was higher than that (6.53 +/- 2.09/mm2) in those who were still alive, the difference has statistical significance (P < 0.05). In different tumor pathology grading, different differentiation, the nm23H1 positive expression is significantly different (P < 0.05). Higher the nm23H1 expressed, lower the tumor lymph metastasized, but the viability rate was higher, so the nm23H1 gene was thought to have the effect of suppressing gastric cancer occurring and lymph metastasizing. Higher the VEGF-C mRNA expressed, higher the tumor lymph metastasized, but the viability rate was lower. There is close correlation between the VEGFR-3 expression and gastric cancer lymph metastasizing. The higher MLC level indicated neoangiogenesis in gastric cancer. VEGF-C promote neoangiogenesis induced by tumor and play an important role in lymph metastasizing.
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