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INTRODUCTION According to the therapeutic effect and strategy of antisense RNA for hepatocellular carcinoma (HCC), we have specifically synthesized partial cDNA of human insulin-like growth factor Ⅱ (IGFⅡ ) and constructed IGF-Ⅱ cDNA antisense eukaryotic expression vector. The constructed vector was introduced into hepatoma cell line SMMC-7721 to block the intrinsic IGF- Ⅱexpression. The biological behavior changes of hepatoma cells were observed. All these would provide scientific basis for IGF- Ⅱ antisense RNA in the treatment of HCC.