Tiazofurin injection (150 mg/kg, i.p.) into rats bearing hepatoma 3924A increased in the tumor the pools of guanine, uridine, thymine, hypoxanthine, inosine, and thymidine 3.5-, 4.4-, 8.0- 18.4-, 18.7- and 42-fold over the controls. There were only minor changes in the host liver. This is the first report showing a selective action of tiazofurin in cancer cells on the concentrations of nucleosides and bases, indicating that these might be used as markers of the impact of tiazofurin in clinical trials.
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