First-dose and steady-state pharmacokinetics of orally administered crizotinib in children with solid tumors: a report on ADVL0912 from the Children's Oncology Group Phase 1/Pilot Consortium

Frank M Balis, Patrick A Thompson, Yael P Mosse, Susan M Blaney, Charles G Minard, Brenda J Weigel, Elizabeth Fox, Frank M Balis, Patrick A Thompson, Yael P Mosse, Susan M Blaney, Charles G Minard, Brenda J Weigel, Elizabeth Fox

Abstract

Purpose: Characterize the pharmacokinetics of oral crizotinib in children with cancer.

Methods: Sixty-four children with solid tumors or anaplastic large-cell lymphoma (ALCL) enrolled on a phase 1/2 trial of the ALK, MET and ROS1 inhibitor, crizotinib, had pharmacokinetic sampling after the first dose (n = 15) or at steady state (n = 49). Dose levels studied were 100, 130, 165, 215, 280 and 365 mg/m2/dose administered twice daily. Two capsule and two oral liquid formulations were used over the course of the trial. Crizotinib was quantified with a validated HPLC/tandem mass spectrometry method with a lower limit of detection of 0.2 ng/mL. Pharmacokinetic parameters were derived using non-compartmental analysis.

Results: Time to peak plasma concentration was 4 h. At 280 mg/m2 (MTD), mean (±SD) steady-state peak plasma concentration was 717 ± 201 ng/mL, and steady-state trough plasma concentration was 480 ± 176 ng/mL. At steady state, AUC0-τ was proportional to dose over the dose range of 215-365 mg/m2/dose. Apparent clearance of crizotinib was 731 ± 241 mL/min/m2. Steady-state AUC0-τ at 280 mg/m2/dose was 2.5-fold higher than the AUC0-∞ in adults receiving 250 mg (~140 mg/m2). Age, sex and drug formulation do not account for the inter-subject variability in AUC0-τ at steady state. The accumulation index was 4.9, and the half-life estimated from the accumulation index was 36 h.

Conclusions: The pharmacokinetics of oral crizotinib in children is similar to that in adults. Steady-state trough-free crizotinib concentrations in plasma at the MTD exceed inhibitory concentrations of crizotinib in ALCL cell lines. CLINICALTRIALS.

Gov identifier: NCT00939770.

Keywords: ALK; Childhood cancer; Children; Crizotinib; Pharmacokinetics.

Conflict of interest statement

F. Balis has research funding from United Therapeutics Corp.; Y. Mosse has research funding from Pfizer, Inc. and Novartis; E. Fox has research funding from Glaxo Smith Kline, Merck and Incyta. Ethical approval The phase 1 clinical trial of crizotinib was reviewed and approved by the Institutional Review Boards at each participating institution, and the clinical trial was conducted in accordance with the ethical standards outlined in the Declaration of Helsinki and the US Federal Regulations governing research in human subjects.

Figures

Fig. 1
Fig. 1
Plasma concentration–time profiles in subjects studied after the first dose and at steady state at 6 dose levels. Points are the geometric mean and error bars are the SD
Fig. 2
Fig. 2
Relationship between AUC to the last measured time point (24 h) for subjects studied after the first dose or AUC over the 12-h dosing interval at steady state and the administered dose of oral crizotinib normalized to subject’s body surface area
Fig. 3
Fig. 3
Relationship of gender (left) and age by crizotinib formulation (right) to the AUC0–τ at steady state normalized to the administered dose per m2

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Source: PubMed

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