The aim of the present in vivo study was to determine the kinetics of the genotoxic and cytotoxic activities of cladribine and clofarabine in mouse normoblasts using flow cytometry. Mice in groups of five were treated with cladribine or clofarabine. Blood samples were obtained from the mouse tails before treatment and every 8 hr posttreatment for 72 hr. These samples were cytometrically scored for micronucleated reticulocytes (RETs), and the percentage of RETs was determined. The results showed that clofarabine and cladribine have early cytotoxic effects that are related to the genotoxic effects reported in previous studies; the drugs have both complex long-lasting genotoxic and cytotoxic kinetic activity, with similar profiles that suggest a relationship between the genotoxic and cytotoxic parameters. The initial genotoxkinetics timing of clofarabine is equivalent to those of difluorodeoxycytidine, likely because both agents inhibit DNA polymerase. Clofarabine shows a higher genotoxic and cytotoxic efficiency than cladribine, in agreement with previous results.
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