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Objective:To investigate the effect of insulin-like growth factor 1 receptor (IGF1R) small interfering RNA (siRNA)on the growth of human liver cancer SMMC7721 cell xenograft in nude mice.Methods:siRNAtargeting IGF1R was designed,and plasrnid SMMC7721-1GF1R-siRNA was constructed and transfected into SMMC7721 cells (SMMC7721-1GF1R-siRNAcells); the cells transfected with SMMC7721-1GF1 R-mutation (SMMC7721-1GF1 R-mutation cells) were used as negative control,and untransfected cells as empty control.Stable cell clones were screened by G418,and transplanted into nude mice to establish cancer xenograft.Tumor growth was monitored.Tumor morphology was observed with HE staining.The expression of IGF1R protein in tumor tissues was detected by Western blot.Microvessel density (MVD) in tumor tissues was detected by SP immunohistochemistry.Cell apoptosis was detected by terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling (TUNEL) assay.Results:The tumor volume was significantly smaller in SMMC7721-1GF1R-siRNA group than in SMMC7721-1GF1R-mutation and SMMC7721 groups (P＜0.05).Necrosis and cell apoptosis were found in SMMC7721-1GF1R-siRNA group.The expression of tGF1R protein was significantly lower in SMMC7721-1GF1R-siRNA group than in SMMC7721-1GF1R-mutation and SMMC7721 groups (P＜0.05).MVD was significantly lower in SMMC7721-1GF1R-siRNA group than in SMMC7721-1GF1R-mutation and SMMC7721 groups (11.3±4.4 vs.36.7±7.6 and 28.4±6.5,P＜0.05).The apoptosis rate of tumor cells was significantly higher in SMMC7721-1GF1R-siRNA group than in SMMC7721-1GF1 R-mutation and SMMC7721 groups [(50.2±6.4)% vs.(5.4±1.0)% or (6.0±2.1)%,P＜0.05].Conclusion:1GF1R siRNA can inhibit the growth of SMMC7721 cell xenograft in nude mice.