In vitro- forsøg har vist, at clofarabin hæmmer cellevækst i og er cytotoksisk over for en lang række hurtigt prolifererende hæmatologiske og faste tumorcellelinier.
In vitro studies have demonstrated that clofarabine inhibits cell growth in and is cytotoxic to a variety of rapidly proliferating haematological and solid tumour cell lines.