NCI Drug Dictionary

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The NCI Drug Dictionary contains technical definitions and synonyms for drugs/agents used to treat patients with cancer or conditions related to cancer. Each drug entry includes links to check for clinical trials listed in NCI's List of Cancer Clinical Trials.

iodine I 131 monoclonal antibody 8H9
A radioimmunoconjugate consisting of the iodine 131-radiolabeled murine IgG1 monoclonal antibody 8H9 directed against the surface immunomodulatory glycoprotein 4Ig-B7-H3 with potential radioimaging and radioimmunotherapeutic uses. Iodine I 131 monoclonal antibody 8H9 binds to 4Ig-B7-H3 (human B7-H3 with 4 Ig-like domains) and may be used to radioimage and/or destroy tumor cells that express tenascin. 4Ig-B7-H3 inhibits T-cell activation and the production of effector cytokines such as interferon-gamma and interleukin-4; it is expressed on the cell membranes of a wide variety of tumors of neuroectodermal, mesenchymal and epithelial origin and is highly expressed on monocyte-derived dendritic cells (mdDCs). In vitro, it has been shown that monoclonal antibody-mediated masking of 4Ig-B7-H3 on neuroblastoma cells resulted in the enhancement of natural killer (NK)-mediated lysis of target cells. Check for active clinical trials using this agent. (NCI Thesaurus)
Abbreviation:iodine I 131 MOAB 8H9