A naturally occurring serine derivative diazo compound with antineoplastic properties, Azaserine functions as a purine antagonist and glutamine analogue (glutamine amidotransferase inhibitor) that competitively inhibits pathways in which glutamine is metabolized. An antibiotic and antitumor agent, Azaserine is used in clinical studies as a potential antineoplastic agent. Check for active clinical trials using this agent. (NCI Thesaurus)