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.

A sulfonyl hydrazine prodrug with antineoplastic activity. Laromustine releases the DNA chloroethylating agent 90CE after entering the blood stream; 90CE chloroethylates alkylates the 06 position of guanine, resulting in DNA crosslinking, strand breaks, chromosomal aberrations, and disruption of DNA synthesis. Intracellular metabolism of this agent also releases methyl isocyanate which inhibits 06-alkyl-guanine transferase, an enzyme involved with DNA repair. Check for active clinical trials using this agent. (NCI Thesaurus)

US brand name:Cloretazine
Code name:VNP40101M
Chemical structure:
  • 1,2-bis(methylsulfonyl)-1-(2-chloroethyl)-2-(methylaminocarbonyl)hydrazine
  • 2'-(2-chloroethyl)-N-methyl-1',2'-bis(methylsulfonyl)carbamohydrazide
  • methanesulfonic acid, 1-(2-chloroethyl)-2-[(methylamino)carbonyl]-2- (methylsulfonyl)hydrazide