NCIt synonyms : Iodine I 131 MOAB 8H9; Iodine I 131 Monoclonal Antibody 8H9;
NCIt related terms : OMBURTAMAB I-131;
NCIt definition : 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.;