Objective:To screen for EGFRvⅢ specific single-chain Fv (scFv) by phage display library and to examine its targeting activity. Methods:EGFRvⅢ specific scFv phage library was constructed,and the positive EGFRvⅢ-scFv clone was screened by ELISA. After cloned into pCANTAB-Thrombin-His vector,EGFRvⅢ-scFv plasmid was transformed into E.coli HB2151,and soluble EGFRvⅢ-scFv was induced by IPTG. The specific binding activity of EGFRvⅢ-scFv with EGFRvⅢ was studied by indirect immunofluorescence and in vivo imaging. R...