NCIt definition : A fluoropyrimidine derivative and oral prodrug of the antineoplastic agent 5-fluorouracil
(5-FU) with antitumor activity. Doxifluridine, designed to circumvent the rapid degradation
of 5-FU by dihydropyrimidine dehydrogenase in the gut wall, is converted into 5-FU
in the presence of pyrimidine nucleoside phosphorylase. 5-FU interferes with DNA synthesis
and subsequent cell division by reducing normal thymidine production and interferes
with RNA transcription by competing with uridine triphosphate for incorporation into
the RNA strand.;