Genotoksicitetsforsøg viste, at clofarabin ikke var mutagent i en tilbagemutationstest med bakterier, men var klastogent i en ikke- aktiveret kromosomal aberrationstest af ovarieceller fra kinesiske hamstere og i en in vivo- mikronukleustest hos rotter.
Genotoxicity studies demonstrated that clofarabine was not mutagenic in the bacterial reverse mutation assay, but did induce clastogenic effects in the non-activated chromosomal aberration assay in Chinese Hamster Ovary (CHO) cells and in the in vivo rat micronucleus assay.