Summary
A study was designed to investigate the fate of navelbine (NVB) and its excretion routes in two cancer patients treated with tritiated NVB (30mg/m2) by i.v. bolus injection. Plasma and red blood cell concentrations and urine and stool elimination were monitored over long periods of time. NVB plasma and urine concentrations were measured by both radioimmunoassay (RIA) and direct radioactive (RA) determination. Samples were also analyzed by high-performance liquid chromatography to evaluate the importance of NVB metabolism. Whereas the major excretion route for NVB was the stool (from 34% to 58.4% of the total dose given over 21 days), urinary excretion was low (about 21% within the same time period), corresponding mainly to that of unchanged drug. Thus, a good correlation was found between RIA and RA determinations in urine. In contrast, plasma area under the curve (AUC) values obtained after RA and RIA analysis differed markedly (AUC RIA/AUC RA=0.23–0.31), demonstrating that a significant proportion of the plasma-circulating drug was biotransformed, mainly during the last elimination phase. This could have important pharmacologic and toxicologic implications in clinical practice.
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Boré, P., Rahmani, R., van Cantfort, J. et al. Pharmacokinetics of a new anticancer drug, navelbine, in patients. Cancer Chemother. Pharmacol. 23, 247–251 (1989). https://doi.org/10.1007/BF00451650
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DOI: https://doi.org/10.1007/BF00451650