Osimertinib Western and Asian clinical pharmacokinetics in patients and healthy volunteers: implications for formulation, dose, and dosing frequency in pivotal clinical studies

Cancer Chemother Pharmacol. 2016 Apr;77(4):767-76. doi: 10.1007/s00280-016-2992-z. Epub 2016 Feb 22.

Abstract

Purpose: Osimertinib (AZD9291) 80 mg once daily is approved by the US FDA for the treatment of patients with metastatic EGFR T790M-positive NSCLC whose disease has previously progressed on EGFR-TKI therapy. Osimertinib PK was evaluated to define the dose and dosing interval, whether a fixed-dosing approach can be used globally, and the impact of formulation and food on exposure.

Methods: AURA (NCT01802632): single- and multiple-dose PK of osimertinib (20-240 mg daily) was determined in patients with advanced NSCLC. Bioavailability study (NCT01951599): single-dose PK of osimertinib (20 mg) was determined in healthy volunteers with administration of capsule, solution, or tablet formulations fasted, and as a tablet in the fed and fasted state.

Results: Osimertinib was slowly absorbed and displayed dose-proportional increases in exposure from 20 to 240 mg. Distribution was extensive and clearance low to moderate, resulting in a mean half-life of 48.3 h. Steady state was achieved by 15 days of dosing, consistent with single-dose PK, with a peak-to-trough ratio of 1.6. Two active metabolites circulated at ~10 % of osimertinib exposure. Ethnicity did not appear to affect exposure. Osimertinib PK profiles in healthy volunteers were similar to those in patients and were unaffected by formulation. Food caused a clinically insignificant increase in exposure.

Conclusions: Osimertinib PK supports once-daily dosing; the same dose for Asian and non-Asian populations; a fixed-dosing approach; a minimal effect of food on exposure; and a switch to tablet formulation without alteration to dose or schedule. Osimertinib plasma concentrations are sustained throughout the dosing period, which is considered optimal for efficacy.

Keywords: Bioavailability; Food effect; Multiple dose; Osimertinib; Pharmacokinetics; Single dose.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acrylamides
  • Aniline Compounds
  • Antineoplastic Agents / pharmacokinetics*
  • Asian Continental Ancestry Group
  • Chemistry, Pharmaceutical
  • Female
  • Food-Drug Interactions
  • Humans
  • Male
  • Middle Aged
  • Piperazines / administration & dosage
  • Piperazines / pharmacokinetics*
  • Protein Kinase Inhibitors / pharmacokinetics*

Substances

  • Acrylamides
  • Aniline Compounds
  • Antineoplastic Agents
  • Piperazines
  • Protein Kinase Inhibitors
  • osimertinib