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.

zirconium Zr 89-labeled RO5479599
A radioimmunoconjugate containing a glycoengineered, humanized monoclonal antibody directed against the human epidermal growth factor receptor HER3 (ErbB3) and labeled with the radioisotope zirconium Zr 89, with radioisotopic activity and potential use as an imaging agent as well as potential antineoplastic activity. Upon administration, the RO5479599 moiety of zirconium Zr 89-labeled RO5479599 binds to the extracellular domain of HER3 and inhibits HER3 dimerization, thereby preventing EGFR-dependent signaling. In addition, RO5479599 elicits enhanced antibody-dependent cellular cytotoxicity (ADCC). Upon binding, the radioisotope moiety may be detected using positron emission tomography (PET), thereby allowing the imaging and quantification of HER3-expressing tumor cells. HER3, a member of the epidermal growth factor receptor (EGFR) family of receptor tyrosine kinases, is frequently overexpressed in tumors; it has no active kinase domain but is activated through heterodimerization with other members of the EGFR receptor family, such as HER2. Check for active clinical trials using this agent. (NCI Thesaurus)

Synonym:89Zr-labeled RG7116
89Zr-labeled RO5479599