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  • A fusion protein consisting of an anti-single-chain variable fragment (scFv) peptide sequence targeting the extracellular domain of human CD133 (prominin-1) (anti-CD133scFV) and a deimmunized truncated form of Pseudomonas exotoxin A (38-kDa derivative of PE; PE38) where the five C-terminal amino acid residues have been replaced with the endoplasmic reticulum (ER) retention signal, KDEL, with potential antineoplastic activity. Upon administration of the anti-CD133-PE38-KDEL fusion protein, the anti-CD133 scFV moiety targets and binds to CD133, which is expressed on a variety of tumor cells. Upon internalization of the receptor-fusion protein complex, the KDEL sequence targets the fusion protein to the ER, where the PE38 exotoxin portion then inhibits protein synthesis, which results in a reduction of proliferation of CD133-expressing tumor cells. CD133, a glycoprotein expressed by a variety of cancers and especially by cancer stem cells (CSCs), plays a key role in tumor initiation, proliferation and progression. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C131828\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C131828\' NCI Thesaurus)
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