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  • An Fc-bearing humanized bispecific dual-affinity re-targeting (DART) protein composed of Fv regions derived from monoclonal antibodies against the immunoregulatory protein B7-homologue 3 (B7-H3, CD276) and the T-cell surface antigen CD3, with potential immunostimulating and antineoplastic activities. Upon administration of the MGD009 DART protein, the anti-B7-H3 component targets and binds to the cell surface antigen B7-H3; at the same time, the anti-CD3 component binds to human CD3. This cross-links the T cells to B7-H3-expressing tumor cells, activates and redirects endogenous T cells to kill B7-H3-expressing tumor cells, and inhibits proliferation of B7-H3-expressing tumor cells. B7-H3, a type I transmembrane protein and a member of the B7 co-stimulatory protein superfamily, is overexpressed on certain tumor cell types and on various immune cells but is minimally expressed by normal human tissues. B7-H3 is a negative regulator of T-cell activation and its overexpression plays a key role in immuno-evasion, tumor cell invasion and metastasis, and its expression is correlated with poor prognosis. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C136983\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C136983\' NCI Thesaurus)
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