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.

carbon C 14-labeled ixazomib
A radioconjugate comprised of the orally-available, reversible 20S proteasome inhibitor ixazomib that is labeled with the isotope carbon C 14. Upon administration, the ixazomib moiety hydrolyzes and generates its active form, MLN2238, which inhibits the activity of the 20S catalytic core subunit of the proteasome. This blocks the targeted proteolysis normally performed by the proteasome, which results in an accumulation of unwanted or misfolded proteins. The accumulation of protein may disrupt various cell signaling pathways, induce apoptosis, and inhibit tumor growth. In addition, this agent targets tumor suppressor microRNA-33b (miR-33b). Labeling with the radioactive tracer carbon C 14 allows for evaluation of ixazomib’s absorption, distribution, metabolism and excretion (ADME). Check for active clinical trials using this agent. (NCI Thesaurus)
Chemical structure:[14C]--1, 4-(R,S)-(carboxymethyl)-2-((R)-1-(2-(2,5-dichlorobenzamido)acetamido)-3-methylbutyl)-6-oxo-1,3,2-dioxaborinane-4-carboxylic acid