NCIt definition : The lipophilic 5'-elaidic acid ester of the deoxycytidine analog cytosine arabinoside
(cytarabine; Ara-C) with potential antineoplastic activity. As a prodrug, elacytarabine
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, elacytarabine 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.;