ObjectiveTo investigate the effect and mechanism of silent information regulator 1 (SIRT1)in invasion of human gastric cancer. MethodsThe expressions of SIRT1 protein and vascular endothelial growth factor A (VEGF-A) protein in 46 cases of gastric cancer were tested by immunohistochemical SP method; the effect of expressions of SRIT1 and VEGF-A protein on prognosis of gastric cancer was analyzed by Kaplan-Meier test; the expressions of SRIT1 and VEGF-A protein in human gastric mucosa GES-1 cells and SGC7901 cells were tested by Western blot method; after the interference of siRNA on SIRT1 gene, expressions of SRIT1 and VEGF-A protein were also tested by Western method, and the invasion ability was determined by Transwell test. ResultsCompared with normal gastric mucosa tissues, expression levels of SIRT1 and VEGF-A protein of gastric tissues were both higher (P < 0.050), and survival situation of patients with SIRT1-positive (P=0.001) or SIRT1-positive and VEGF-A-positive (P=0.006) were both bad, but there was no significant difference on the relationship between prognosis of gastric cancer and expression of VEGF-A protein (P=0.091). Expression levels of SITR1 protein (P=0.010) and VEGF-A protein (P=0.020) in GES-1 cells were both higher than those of SGC7901 cells. In siRNA positive group, expressions of SIRT1 and VEGF-A protein (P=0.010) of SGC7901 cells down-regulated, and invasion ability decreased (P=0.000). ConclusionsSIRT1 gene may promote the expression of VEGF-A protein and the invasion ability of gastric cancer, it may be a therapeutic target of invasion inhibition for gastric cancer.