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目的：探讨二甲双胍联合照射对人肺癌细胞的侵袭和转移能力的影响，为研发肺癌有效的靶向治疗方案提供新思路。方法应用 MTT 法检测二甲双胍联合照射对肺癌肿瘤细胞的抑制作用，划痕和侵袭实验观察肿瘤细胞迁移和侵袭能力的改变，Western blot 检测其侵袭转移相关因子 MMP －2、MMP －9、VEGF 的表达情况。结果MTT 显示，不同浓度的二甲双胍对肺癌细胞 A549具有显著的增殖抑制作用。二甲双胍组、照射组和联合处理组12 h 和24 h 的迁移距离均低于对照组。联合处理组作用于 A549细胞的侵袭抑制作用也明显高于单用二甲双胍组和照射组。联合处理组可下调 MMP －2、MMP －9和 VEGF 的表达。结论二甲双胍降低了肺癌肿瘤细胞的生长，下调了 MMP －2、MMP －9、VEGF 的表达，并有效抑制肺癌细胞的侵袭能力，提示二甲双胍在肺癌转移过程中起重要作用，可以作为肺癌的潜在治疗方案。“,”Objective To investigate the effect of metformin combined with irradiate on migration and invasion capacity in lung cancer so as to shed new light on the development of target therapy for lung cancer.Methods Inhibitory effect of metformin combined with irradiation on A549 cells was detected by MTT.The migration and invasion capacity of tumor cells were assessed by wound healing assay and transwell chamber with matrigelgel,respectively.Expression of MMP -2,MMP -6,VEGF was measured by Western blot.Results MTT assay showed an obvious suppression of A549 cells proliferation in response to Met-formin treatment.12 h and 24 h migration distances in the metformin group,irradiation group and combined treatment group were lower than the control group.The combined treatment with metformin and Irradiation also caused a significantly higher inhibition rate of A549 cells invasion than metformin or Irradiate alone.The combined treatment group could down regulate the expression of VEGF,MMP -9 and MMP -2.Conclusion Metformin reduced the growth of lung cancer tumor cells,down regulated the ex-pression of MMP -2,MMP -9 and VEGF,inhibited the lung cancer cell invasion.It suggests that metformin can play an impor-tant role in the metastasis of lung cancer and maybe a potential therapy for lung cancer.