Abstract
Background
Validated genomic biomarkers for oncological drugs are expanding to improve targeted therapies. Pharmacogenetics research focusing on the mechanisms underlying imatinib suboptimal response might help to explain the different treatment outcomes and drug safety profiles.
Objective
To investigate whether polymorphisms in genes encoding cytochrome P450 (CYP) enzymes and ABCB1 transporter affect imatinib pharmacokinetic parameters.
Methods
A prospective, multicenter, pharmacogenetic pilot study was performed in the context of two separate oral imatinib bioequivalence clinical trials, which included 26 healthy volunteers. DNA was extracted in order to analyze polymorphisms in genes CYP2B6, CYP2C9, CYP2C19, CYP2D6, CYP3A4, CYP3A5 and ABCB1. Imatinib plasma concentrations were measured by HPLC–MS/MS. Pharmacokinetic parameters were calculated by non-compartmental methods using WinNonlin software.
Results
Volunteers (n = 26; aged 24 ± 3 years; 69% male) presented regular pharmacokinetic imatinib data (concentration at 24 h, 436 ± 140 ng/mL and at 72 h, 40 ± 26 ng/mL; AUC0–72 32,868 ± 10,713 ng/mL⋅h; and Cmax 2074 ± 604 ng/mL). CYP2B6 516GT carriers showed a significant reduction of imatinib concentration at 24 h (23%, 391 ng/dL vs 511 ng/dL in 516GG carriers, p = 0.005) and elimination half-life (11%, 12.6 h vs 14.1 h in 516GG carriers, p = 0.041). Carriers for CYP3A4 (*22/*22, *1/*20 and *1/*22 variants) showed a reduced frequency of adverse events compared to *1/*1 carriers (0 vs 64%, p = 0.033). The other polymorphisms analyzed did not influence pharmacokinetics or drug toxicity.
Conclusion
CYP2B6 G516T and CYP3A4 *20,*22 polymorphisms could influence imatinib plasma concentrations and safety profile, after single-dose administration to healthy subjects. This finding needs to be confirmed before it is implemented in clinical practice in oncological patients under treatment with imatinib.
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We would like to thank the help received from nursery of clinical trial units and the altruism and patience of patients included in the study.
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MÁP conceived and planned the experiment, got the grant of FISABIO and took the lead in writing the manuscript and contributed to the interpretation of the results. Javier Muriel designed the model and the computational framework, analyzed the data, and gave support in writing the manuscript. MS-R carried out the experiments. AMB, FA-S, JF conceived and planned the experiments and contributed to the interpretation of the result. AMP took the lead in writing the manuscript and contributed to the interpretation of the result. All authors provided critical review and helped shape the research, analysis and manuscript.
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Present study was partially funded by Foundation for the Promotion of Health and Biomedical Research of the Valencian Community (FISABIO, Valencia, Spain; code: UGP-15-212).
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All procedures were performed at Clinical Research and Clinical Trials Unit (Hospital La Paz, Madrid, Spain) and Alicante Clinical Trials Unit (Department of Health Alicante-General Hospital, Alicante, Spain). The study was approved by the local Ethics Committees and carried out in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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All data and materials as well as software application or custom code support our published claims and comply with field standards.
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Pena, M.Á., Muriel, J., Saiz-Rodríguez, M. et al. Effect of Cytochrome P450 and ABCB1 Polymorphisms on Imatinib Pharmacokinetics After Single-Dose Administration to Healthy Subjects. Clin Drug Investig 40, 617–628 (2020). https://doi.org/10.1007/s40261-020-00921-7
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DOI: https://doi.org/10.1007/s40261-020-00921-7