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.

The lipophilic 5'-elaidic acid ester of the deoxycytidine analog cytosine arabinoside (cytarabine; Ara-C) with potential antineoplastic activity. As a prodrug, CP-4055 is converted intracellularly into cytarabine triphosphate by deoxycytidine kinase and subsequently competes with cytidine for incorporation into DNA, thereby inhibiting DNA synthesis. Compared to cytarabine, CP-4055 shows increased cellular uptake and retention, resulting in increased activation by deoxycytidine kinase to cytarabine triphosphate, decreased deamination and deactivation by deoxycytidine deaminase, and increased inhibition of DNA synthesis. This agent also inhibits RNA synthesis, an effect not seen with cytarabine. Check for active clinical trials using this agent. (NCI Thesaurus)

Code name:CP-4055
Chemical structure:
  • 2(1H)-Pyrimidinone, 4-amino-1-[5-O-[(9E)-1-oxo-9-octadecenyl]-β-D-arabinofuranosyl]-
  • 4-amino-1-[5-O-[(9E)-octadec-9-enoyl]-β-D-arabinofuranosyl]pyrimidin-2(1H)-one