Determination of the absolute bioavailability of oral imatinib using a stable isotopically labeled intravenous imatinib-d8 microdose

Jeroen Roosendaal, Stefanie L. Groenland, Hilde Rosing, Luc Lucas, Nikkie Venekamp, Bastiaan Nuijen, Alwin D.R. Huitema, Jos H. Beijnen, Neeltje Steeghs

Onderzoeksoutput: Bijdrage aan tijdschriftArtikelpeer review

3 Citaten (Scopus)

Samenvatting

Purpose: The aim of this study was to ascertain whether the absolute bioavailability of oral imatinib (Glivec®) during steady state plasma pharmacokinetics in cancer patients could be determined through a concomitant intravenous administration of a single 100 μg microdose of deuterium labeled imatinib (imatinib-d8). Secondly, the usefulness of liquid chromatography–tandem mass spectrometry (LC-MS/MS) was investigated for simultaneous analysis of orally and intravenously administered imatinib. Methods: Included patients were on a stable daily dose of 400 mg oral imatinib prior to study participation. On day 1, patients received a 100 μg intravenous imatinib-d8 microdose 2.5 h after intake of the oral dose. Plasma samples were collected for 48 h. Imatinib and imatinib-d8 concentrations were simultaneously quantified using a validated LC-MS/MS assay. The absolute bioavailability was calculated by comparing the dose-normalized exposure with unlabeled and stable isotopically labeled imatinib in plasma. Results: A total of six patients were enrolled. All patients had a history of gastrointestinal stromal tumors (GIST). The median absolute bioavailability of oral imatinib at steady state was 76% (range 44–106%). Imatinib and imatinib-d8 plasma concentrations were quantified in all collected plasma samples, with no samples below the limit of quantification for imatinib-d8. Conclusion: The absolute bioavailability of imatinib was successfully estimated at steady state plasma pharmacokinetics using the stable isotopically labeled microdose trial design. This study exhibits the use of a stable isotopically labeled intravenous microdose to determine the absolute bioavailability of an oral anticancer agent in patients with LC-MS/MS as the analytical tool.

Originele taal-2Engels
Pagina's (van-tot)1075-1082
Aantal pagina's8
TijdschriftEuropean Journal of Clinical Pharmacology
Volume76
Nummer van het tijdschrift8
DOI's
StatusGepubliceerd - 1 aug. 2020
Extern gepubliceerdJa

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