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.

An orally available 5-substituted 2-pyrimidinone-2'-deoxyribonucleoside analogue and prodrug of 5-iododeoxyuridine (IUdR), an iodinated analogue of deoxyuridine, with radiosensitizing activity. Upon oral administration, ropidoxuridine (IPdR) is efficiently converted to idoxuridine (IUdR) by a hepatic aldehyde oxidase. In turn, IUdR is incorporated into DNA during replication, thereby sensitizing cells to ionizing radiation by increasing DNA strand breaks. Compared to IUdR, ropidoxuridine is associated with a lower toxicity profile and improved anti-tumor activity. Check for active clinical trials using this agent. (NCI Thesaurus)

Chemical structure:
  • 2(1H)-pyrimidinone, 1-(2-deoxy-beta-D-erythro-pentofuranosyl)-5-iodo-
  • 5-iodo-2-pyrimidinone 2' deoxyribonucleoside
  • 5-iodo-2-pyrimidinone-2'-deoxyribose