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S-phase dependent cytogenetic toxicity of 5-fluorouracil in bone marrow cells of mice.

The in vivo cytogenetic toxicity of three different doses (5,10 and 15 mg/kg) of 5-fluorouracil (5-FU) (in Fluracil) was assessed in bone marrow cells of mice. At 24 hrs post-treatment the induced chromosomal aberrations, mostly chromatid breaks and fragments, by all the three different concentrations of 5-FU were found statistically significant. However, mitotic index study at 24 hrs post-treatment indicated it as nonmitotoxic. At 30 hrs posttreatment, all the three doses of 5-FU induced a statistically significant number of micronuclei per thousand polychromatic erythrocytes. This indicated 5-FU as nonmitotoxic but highly clastogenic in bone marrow cells of mice.