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Investigational New Drugs

, Volume 32, Issue 5, pp 985–994 | Cite as

Pharmacokinetic/Pharmacodynamic modeling of abexinostat-induced thrombocytopenia across different patient populations: application for the determination of the maximum tolerated doses in both lymphoma and solid tumour patients

  • Quentin Chalret du Rieu
  • Sylvain Fouliard
  • Mélanie White-Koning
  • Ioana Kloos
  • Etienne ChatelutEmail author
  • Marylore Chenel
PHASE I STUDIES

Summary

Background In the clinical development of oncology drugs, the recommended dose is usually determined using a 3 + 3 dose-escalation study design. However, this phase I design does not always adequately describe dose-toxicity relationships. Methods 125 patients, with either solid tumours or lymphoma, were included in the study and 1217 platelet counts were available over three treatment cycles. The data was used to build a population pharmacokinetic/pharmacodynamic (PKPD) model using a sequential modeling approach. Model-derived Recommended Doses (MDRD) of abexinostat (a Histone Deacetylase Inhibitor) were determined from simulations of different administration schedules, and the higher bound for the probability of reaching these MDRD with a 3 + 3 design were obtained. Results The PKPD model developed adequately described platelet kinetics in both patient populations with the inclusion of two platelet baseline counts and a disease progression component for patients with lymphoma. Simulation results demonstrated that abexinostat administration during the first 4 days of each week in a 3-week cycle led to a higher MDRD compared to the other administration schedules tested, with a maximum probability of 40 % of reaching these MDRDs using a 3 + 3 design. Conclusions The PKPD model was able to predict thrombocytopenia following abexinostat administration in both patient populations. A model-based approach to determine the recommended dose in phase I trials is preferable due to the imprecision of the 3 + 3 design.

Keywords

Abexinostat Thrombocytopenia PKPD model Recommended Dose Simulation Disease progression 

Notes

Acknowledgments and disclosures

Authors would like to thank Pharmacyclics for providing data from the PCYC-402 and the PCYC-403 clinical studies.

Author’s disclosures of potential conflicts of interest: Quentin Chalret du Rieu, Sylvain Fouliard, Ioana Kloos and Marylore Chenel are employed by Institut de Recherches Internationales Servier. The other author (s) indicated no potential conflicts of interest.

This work was integrated in a Ph. D. project (Quentin Chalret du Rieu), granted by Institut de Recherches Internationales Servier.

We thank Ms Katie Owens for her editorial assistance.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Quentin Chalret du Rieu
    • 1
    • 2
  • Sylvain Fouliard
    • 1
  • Mélanie White-Koning
    • 2
  • Ioana Kloos
    • 3
  • Etienne Chatelut
    • 2
    • 4
    Email author
  • Marylore Chenel
    • 1
  1. 1.Clinical Pharmacokinetics DepartmentInstitut de Recherches Internationales ServierSuresnesFrance
  2. 2.EA4553Université Paul Sabatier and Institut Universitaire du Cancer Toulouse - OncopoleToulouseFrance
  3. 3.Oncology Business UnitInstitut de Recherches Internationales ServierSuresnesFrance
  4. 4.Institut Universitaire du Cancer Toulouse - OncopoleToulouse Cedex 9France

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