Abstract
Background
In patients with relapsed/refractory (R/R) diffuse large B-cell lymphoma (DLBCL), salvage chemotherapy regimens (e.g., rituximab, ifosfamide, carboplatin, and etoposide, R-ICE) yield poor outcomes. Carfilzomib, an irreversible proteasome inhibitor, can overcome acquired rituximab-chemotherapy resistance and, when combined with R-ICE, improves outcomes in patients with R/R DLBCL.
Objective
This analysis aimed to develop a population pharmacokinetic/pharmacodynamic (PK/PD) model for carfilzomib in R/R DLBCL patients.
Patients and Methods
In a single-center, open-label, prospective phase 1 study, patients received carfilzomib (10, 15, or 20 mg/m2) on days 1, 2, 8, and 9, and standard doses of R-ICE on days 3–6 every 21 days (maximum of three cycles). Carfilzomib plasma concentrations up to 24 h postinfusion were measured by liquid chromatography coupled with tandem mass spectrometry. Proteasome activity (PD biomarker) in peripheral blood mononuclear cells was assessed on days 1–2 with sparse sampling. PK/PD models were developed using NONMEM v7.4.1 interfaced with Finch Studio v1.1.0 and PsN v4.7.0. Model selection was guided by objective function value, goodness‐of‐fit, and visual predictive checks. Stepwise covariate modeling was used for covariate selection.
Results
Twenty-eight patients were enrolled in the PK/PD analysis, from whom 217 PK samples and 127 PD samples were included. Carfilzomib PK was best described by a two-compartment model with linear disposition (typical total clearance of 133 L/h). Proteasome activity was best characterized using a turnover model with irreversible inactivation. All parameters were estimated with good precision. No statistically significant covariates were identified.
Conclusions
A validated population-based PK/PD model of carfilzomib was developed successfully. Further research is needed to identify sources of variability in response to treatment with carfilzomib in combination with R-ICE.
Clinical Trial Registration
ClinicalTrials.gov identifier number NCT01959698.
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Acknowledgements
This work was funded by Amgen and the National Cancer Institute (NCI) grant P30CA016056 involving the use of Roswell Park Comprehensive Cancer Center’s BMPK Shared Resource. We thank Dr. Thibaud Derippe (University of Buffalo at the time of analysis, currently with AstraZeneca) and Dr. Mfonabasi Ette (University at Buffalo) and Dr. Mohamed Ismail (Enhanced Pharmacodynamics, LLC) for their technical support during the development of the PK/PD model. Also, we are thankful to Dr. Alan Hutson (Dept. of Biostatistics and Bioinformatics, Roswell Park Comprehensive Cancer Center) for providing helpful biostatistical advice and input.
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Funding
This work was funded by Amgen and the National Cancer Institute (NCI) grant P30CA016056 involving the use of Roswell Park Comprehensive Cancer Center’s BMPK Shared Resource.
Conflict of Interest
P.T. received consulting fees from ADC therapeutics, TG therapeutics, Genmab, Genentech, Lilly USA, and Seagen. F.J.H.I. is an advisory Board Member for Amgen, Karyopharm Therapeutics, Celgene Corporation, Kura Oncology, AbbVie Inc., Seattle Genetics Inc., Epizyme, Pharmacyclics, Gilead, Kite Pharma, Novartis, and MorphoSys. F.J.H.I. also is a member of the Speaker Bureau of MorphoSys. Lan-Hsi Lin, Mohammad Ghasemi, Sarah M. Burke, Cory K. Mavis, Jenna R. Nichols, Donald E. Mager, and Andrew K.L. Goey declare that they have no conflicts of interest that might be relevant to the contents of this manuscript.
Ethics Approval
The clinical study was performed per the International Council for Harmonization Good Clinical Practice Guideline and the ethical principles of the Declaration of Helsinki and was approved by the institutional review board of Roswell Park Comprehensive Cancer Center (protocol no. I-240813).
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All patients provided written informed consent prior to enrollment in the study.
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Not applicable.
Data Availability
The NONMEM control stream for nonlinear-mixed effect PK/PD modeling has been made available in Supplementary File S6.
Author Contributions
DEM, FJHI, and AKLG designed the project and provided supervision; LL and MG developed the PK/PD model and performed the data analysis; SMB performed the LC–MS/MS analysis; CKM performed the proteasome activity analysis; JRN, PT, and FJHI collected clinical data; FJHI acquired funding; DEM, FJHI, and AKLG supported interpretation of the results; LL and A.K.L.G. wrote the original draft; and all authors critically read, revised, and approved the final manuscript.
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Lin, LH., Ghasemi, M., Burke, S.M. et al. Population Pharmacokinetics and Pharmacodynamics of Carfilzomib in Combination with Rituximab, Ifosfamide, Carboplatin, and Etoposide in Adult Patients with Relapsed/Refractory Diffuse Large B Cell Lymphoma. Targ Oncol 18, 685–695 (2023). https://doi.org/10.1007/s11523-023-00992-4
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DOI: https://doi.org/10.1007/s11523-023-00992-4