Capecitabin er et "prodrug" (et forstadium), der i kroppen omdannes til 5- fluoruracil (5- FU), men omdannelsen sker i højere grad i svulstcellerne end i normalt væv.
Capecitabine is a ‘ prodrug ’ that is converted to 5-fluorouracil (5-FU) in the body, but more is converted in tumour cells than in normal tissues.