Abstract
Background and Objectives
Methotrexate (MTX) is widely used for the treatment of a variety of neoplastic and autoimmune diseases. However, its toxicity and efficacy varied greatly among individuals, and they could be predicted by its pharmacokinetics. Many population pharmacokinetic models have been published to describe MTX pharmacokinetics. The objective of this systematic review was to summarize and discuss covariates with significant influence on MTX pharmacokinetics.
Methods
We searched PubMed and EMBASE databases from their inception to April 2021 for population pharmacokinetic of MTX. The articles were screened by inclusion and exclusion criteria. The characteristics of studies and information for model construction and validation were extracted, summarized and discussed.
Results
Thirty-five articles were included. The two-compartment model well described the pharmacokinetic behavior of MTX. For inter-individual variability, an exponential distribution error model was usually used for high-dose MTX population pharmacokinetic models, while a proportional distribution error model was used for low-dose MTX population pharmacokinetic models. Proportional and combined proportional and additive error models were used to describe residual error. Renal function was an independent indicator of MTX clearance. Body weight, age, gene polymorphisms (SLCO1B1, ABCC2, ABCB1, ABCG2 and MTHFR) and co-medications (proton pump inhibitors, non-steroidal anti-inflammatory drug, dexamethasone, vancomycin, penicillin and salicylic acid) could influence MTX clearance. Body weight, body surface area, age and dosage regimen have significant influence on MTX central compartment volume. Internal bootstrap test, external validation and visual predictive check were used to evaluate model predictive ability.
Conclusions
Various covariates could affect MTX pharmacokinetics, and their relationships have been summarized and discussed. This review will be helpful for researchers to develop their own population pharmacokinetic models and select appropriate models for individualized therapy of MTX.
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Abbreviations
- ALT :
-
Alanine transaminase
- BSA :
-
Body surface area
- BW :
-
Body weight
- CLCR :
-
Creatinine clearance
- CLMTX :
-
Methotrexate clearance
- GFR:
-
Glomerular filtration rate
- HD-MTX :
-
High-dose methotrexate
- IIV:
-
Inter-individual variability
- IOV:
-
Inter-occasion variability
- LD-MTX:
-
Low-dose methotrexate
- MTX:
-
Methotrexate
- PopPK:
-
Population pharmacokinetics
- QMTX :
-
Inter-compartmental clearance of methotrexate
- SCR:
-
Serum creatinine
- VcMTX :
-
Central compartment volume of methotrexate
- VpMTX :
-
Peripheral compartment volume of methotrexate
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Acknowledgements
We thank all authors of the included studies for their hard work.
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Zhigang Zhao was supported by the Beijing Municipal Administration of Hospitals (ZYLX201827). Shenghui Mei was supported by the National Key R&D Program of China (2020YFC2008306) and Beijing Municipal Health Bureau (2018000021469G238).
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Yiming Zhang, Liyu Sun, Libo Zhao, Xiaoling Wang, Zhigang Zhao and Shenghui Mei have no conflicts of interest.
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ZZ and MS designed the review and planned the work of the manuscript. YM and SL performed the literature search. MS and YM analyzed the extracted data. YM, SL, ZL, WY, ZZ and MS drafted and revised the manuscript. All authors approved the final version of this article.
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Zhang, Y., Sun, L., Chen, X. et al. A Systematic Review of Population Pharmacokinetic Models of Methotrexate. Eur J Drug Metab Pharmacokinet 47, 143–164 (2022). https://doi.org/10.1007/s13318-021-00737-6
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DOI: https://doi.org/10.1007/s13318-021-00737-6