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Clin Pharmacokinet. 2013 Dec;52(12):1101-9. doi: 10.1007/s40262-013-0091-4.

Pharmacokinetics of afatinib, a selective irreversible ErbB family blocker, in patients with advanced solid tumours.

Author information

1
Translational Medicine, Boehringer Ingelheim Pharma GmbH & Co KG, Biberach an der Riss, Germany, sven.wind@boehringer-ingelheim.com.

Abstract

BACKGROUND AND OBJECTIVE:

Afatinib is a potent, irreversible, ErbB family blocker in clinical development for the treatment of a variety of solid tumours. This study evaluated the pharmacokinetics of afatinib (10-100 mg once daily) in cancer patients.

METHODS:

Data from 221 patients with advanced solid tumours in four phase I and one phase II trial were analysed using non-compartmental methods.

RESULTS:

Within each dose group, the shape of the geometric mean plasma concentration-time profiles after single and multiple doses were comparable. Maximum plasma concentration (C(max)) values were achieved 2-5 h after dosing and thereafter declined at least bi-exponentially. Steady-state plasma concentrations were attained within 8 days after the start of dosing. The geometric mean terminal elimination half-life at steady state was about 37 h. Repeated dosing resulted in a 2.77-fold accumulation based on the area under the plasma concentration-time curve (AUC), and 2.11-fold accumulation based on C(max) values. A slightly more than dose-proportional increase in afatinib exposure was observed. There was moderate intra-individual variability in afatinib trough concentration values (the geometric coefficient of variation (gCV) ranged from 22.2 to 67.5 %). The inter-patient variability in plasma concentrations was moderate to high (e.g. at the 40 mg dose, the gCVs ranged from 35.6 to 221 %). The exposure to afatinib (as measured by AUC and C(max)) correlated with the severity of the most common adverse events of afatinib--diarrhoea and rash.

CONCLUSION:

The pharmacokinetic profile of afatinib supports a once-daily dosage regimen. As expected for this patient population, the pharmacokinetic parameters of afatinib showed moderate to high inter-patient variability. Afatinib exhibits non-linear pharmacokinetics.

PMID:
23813493
DOI:
10.1007/s40262-013-0091-4
[Indexed for MEDLINE]

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