Abstract
Aim
The pharmacokinetic (PK) properties of cyclosporine (CsA) in renal transplant recipients are patient- and time-dependent. Knowledge of this time-related variability is necessary to maintain or achieve CsA target exposure. Here, we aimed to identify factors explaining variabilities in CsA PK properties and characterize time-varying clearance (CL/F) by performing a comprehensive analysis of CsA PK factors using population PK (popPK) modeling of long-term follow-up data from our institution.
Methods
In total, 3674 whole-blood CsA concentrations from 183 patients who underwent initial renal transplantation were analyzed using nonlinear mixed-effects modeling. The effects of potential covariates were selected according to a previous study and well-accepted theoretical mechanisms. Model-informed individualized therapeutic regimens were also evaluated.
Results
A two-compartment model adequately described the data and the estimated mean CsA CL/F was 32.6 L h−1 (relative standard error: 5%). Allometrically scaled body size, hematocrit (HCT) level, CGC haplotype carrier status, and postoperative time may contribute to CsA PK variability. The CsA bioavailability in patients receiving a prednisolone dose (PD) of 80 mg was 20.6% lower than that in patients receiving 20 mg. A significant decrease (52.6%) in CL/F was observed as the HCT increased from 10.5% to 60.5%. The CL/F of the non-CGC haplotype carrier was 14.4% lower than that of the CGC haplotype carrier at 3 months post operation.
Conclusions
By monitoring body size, HCT, PD, and CGC haplotype, changes in CsA CL/F over time could be predicted. Such information could be used to optimize CsA therapy. CsA dose adjustments should be considered in different postoperative periods.
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Data Availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Funding
This work was supported in part by grants from the ‘2019 Key Clinical Program of Clinical Pharmacy’ (No. shslczdzk06502), and ‘Weak Discipline Construction Project’ (No. 2016ZB0301-01) of Shanghai Municipal Health and Family Planning Commission. We would like to thank Editage (www.editage.cn) for English language editing.
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JJM, XYQ, and WWQ participated in the research design; JJM, XYQ, WWQ, LYX, MZ, and MKZ implemented and conducted the study; JJM, XYQ, and WWQ performed the research and analyzed the data. JJM and WWQ drafted the manuscript, which was revised and approved by all the authors. There are no other relationships or activities that could appear to have influenced the submitted work.
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Mao, J., Qiu, X., Qin, W. et al. Factors Affecting Time-Varying Clearance of Cyclosporine in Adult Renal Transplant Recipients: A Population Pharmacokinetic Perspective. Pharm Res 38, 1873–1887 (2021). https://doi.org/10.1007/s11095-021-03114-9
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DOI: https://doi.org/10.1007/s11095-021-03114-9