NCI Drug Dictionary

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.

gamma-delta tocotrienol
An orally available nutritional supplement containing the gamma and delta forms of the vitamin E family member tocotrienol, with hypocholesterolemic, antithrombotic, antioxidant, and potential antineoplastic activity. Upon oral administration, gamma-delta tocotrienol accumulates in cancer cells and may exert their anti-cancer activity in part through 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase downregulation and/or degradation, cell cycle arrest, and induction of caspase-mediated apoptosis. In addition, this agent may inhibit angiogenesis partially through the blockage of vascular endothelial growth factor receptor (VEGFR) and the inhibition of tumor cell-induced vessel formation. Altogether, this may result in the inhibition of tumor cell growth. Further, this agent prevents free radical formation and inhibits lipid peroxidation. Tocotrienols contain 3 double bonds, absent in tocopherols, on its farnesyl isoprenoid side chain that likely contribute to its anti-cancer activities. Check for active clinical trials using this agent. (NCI Thesaurus)