Summary
The pharmacokinetic profile of high-dose mitomycin C was determined in blood plasma and urine of twelve patients with advanced malignancies in a program including autologous bone marrow transplantation. A total dose of 60 mg/m2 was given, either as a single 60-min infusion or divided into infusions of 30 mg/m2 on each of 2 days or 15 mg/m2 on each of 4 days. One group was given 15-min infusions. Samples of blood plasma and urine were analyzed by high-performance liquid chromatography. Drug concentrations in plasma followed a biphasic pattern, with a terminal elimination half-life of 45 min. This half-life value and other parameters were unaffected by dose level, infusion time, and repeated doses. The lower peak plasma concentrations following 30 mg/m2 given as 60-min infusions compared to the same dose given over 15 min may have accounted for a dramatic drop in the incidence of a severe hemorrhagic colitis. Mitomycin C was excreted in urine at about the same rate as it was eliminated from plasma, but a larger percentage of the dose appeared in urine after 15-min infusions than after 60-min infusions. The pharmacokinetic profile, together with clinical observations, suggests that the dose-limiting toxicity of mitomycin C may be related to peak drug levels, and that both these levels and the toxicity are lessened as the infusion time is increased.
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Schilcher, R.B., Young, J.D., Ratanatharathorn, V. et al. Clinical pharmacokinetics of high-dose mitomycin C. Cancer Chemother. Pharmacol. 13, 186–190 (1984). https://doi.org/10.1007/BF00269026
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DOI: https://doi.org/10.1007/BF00269026