Clinical pharmacology of an atrasentan and docetaxel regimen in men with hormone-refractory prostate cancer

Published

Journal Article

Purpose: This study was conducted to evaluate potential pharmacokinetic interactions between docetaxel and atrasentan as part of a phase I/II clinical trial. Methods: Patients with prostate cancer were treated with intravenous docetaxel (60-75 mg/m2) every 3 weeks and oral atrasentan (10 mg) daily starting on day 3 of cycle 1 and then given continuously. The pharmacokinetics of both drugs were evaluated individually (cycle 1, day 1 for docetaxel; day 21 for atrasentan) and in combination (cycle 2, day 1 for both drugs). Pharmacogenomics of alpha-1-acid glycoprotein (AAG) were also explored. Results: Paired pharmacokinetic data sets for both drugs were evaluable in 21 patients. Atrasentan was rapidly absorbed and plasma concentrations varied over a fourfold range at steady state within a typical patient. The median apparent oral clearance of atrasentan was 17.4 L/h in cycle 1 and was not affected by docetaxel administration (p = 0.9). Median systemic clearance of docetaxel was 51.1 L/h on the first cycle and significantly slower (p = 0.01) compared with that obtained during co-administration of atrasentan, 61.6 L/h. Docetaxel systemic clearance in cycle 1 was 70.0 L/h in patients homozygous for a variant allele in AAG compared with 44.5 L/h in those with at least one wild-type allele (p = 0.03). Conclusion: Genetic polymorphism in AAG may explain some inter-patient variability in docetaxel pharmacokinetics. The systemic clearance of docetaxel is increased by approximately 21 % when given concomitantly with atrasentan; however, atrasentan pharmacokinetics does not appear to be influenced by docetaxel administration. © 2014 Springer-Verlag.

Full Text

Duke Authors

Cited Authors

  • Younis, IR; George, DJ; McManus, TJ; Hurwitz, H; Creel, P; Armstrong, AJ; Yu, JJ; Bacon, K; Hobbs, G; Peer, CJ; Petros, WP

Published Date

  • January 1, 2014

Published In

Volume / Issue

  • 73 / 5

Start / End Page

  • 991 - 997

Electronic International Standard Serial Number (EISSN)

  • 1432-0843

International Standard Serial Number (ISSN)

  • 0344-5704

Digital Object Identifier (DOI)

  • 10.1007/s00280-014-2432-x

Citation Source

  • Scopus