Abstract
Purpose
Intravenous (i.v.) temsirolimus, a novel inhibitor of mammalian target of rapamycin (mTOR), is approved for treatment of renal cell carcinoma. In vitro studies with pooled human liver microsomes showed that temsirolimus and its principal metabolite, sirolimus, inhibit the CYP2D6 isozyme (K i = 1.5 and 5 μM, respectively), indicating potential for pharmacokinetic interaction with agents that are substrates of CYP2D6.
Methods
This 2-period study in healthy subjects investigated the pharmacokinetics of a single oral 50-mg dose of the CYP2D6 substrate desipramine, first without and subsequently with a single coadministered i.v. 25-mg dose of temsirolimus.
Results
The study population consisted of 25 males and 1 female; 10 were black, 12 were white, and 4 were of other races. Plasma and whole blood samples were available from all 26 subjects in period 1 following oral desipramine and from 23 subjects in period 2 following oral desipramine and i.v. temsirolimus coadministration. The 90% confidence intervals for least squares geometric mean ratios of desipramine and 2-hydroxy-desipramine C max, AUCT, and AUC were within 80–125%, indicating that parameter differences did not manifest into clinically relevant exposure changes. A single i.v. 25-mg dose of temsirolimus, alone or with desipramine, was well tolerated in healthy subjects.
Conclusions
A single i.v. 25-mg dose of temsirolimus did not alter disposition of desipramine. Temsirolimus i.v. 25 mg may be safely administered with agents metabolized through the CYP2D6 pathway, but vigilance for drug interaction is warranted in patients with advanced malignancies.
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Abbreviations
- CYP:
-
Cytochrome P450
- mTOR:
-
Mammalian target of rapamycin
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Acknowledgments
This research was supported by Wyeth Research, Collegeville, PA. The authors thank Peloton Advantage for assistance with manuscript preparation.
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Boni, J., Abbas, R., Leister, C. et al. Disposition of desipramine, a sensitive cytochrome P450 2D6 substrate, when coadministered with intravenous temsirolimus. Cancer Chemother Pharmacol 64, 263–270 (2009). https://doi.org/10.1007/s00280-008-0865-9
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DOI: https://doi.org/10.1007/s00280-008-0865-9