Abstract
Background
Interindividual pharmacokinetic variability may influence the clinical benefit or toxicity of cabozantinib in metastatic renal cell carcinoma (mRCC). We aimed to investigate the exposure-toxicity and exposure-response relationship of cabozantinib in unselected mRCC patients treated in routine care.
Methods
This ambispective multicenter study enrolled consecutive patients receiving cabozantinib in monotherapy. Steady-state trough concentration (Cmin,ss) within the first 3 months after treatment initiation was used for the PK/PD analysis with dose-limiting toxicity (DLT) and survival outcomes. Logistic regression and Cox proportional-hazards models were used to identify the risk factors of DLT and inefficacy in patients, respectively.
Results
Seventy-eight mRCC patients were eligible for the statistical analysis. Fifty-two patients (67%) experienced DLT with a median onset of 2.1 months (95%CI 0.7–8.2). In multivariate analysis, Cmin,ss was identified as an independent risk factor of DLT (OR 1.46, 95%CI [1.04–2.04]; p = 0.029). PFS and OS were not statistically associated with the starting dose (p = 0.81 and p = 0.98, respectively). In the multivariate analysis of PFS, Cmin, ss > 336 ng/mL resulted in a hazard ratio of 0.28 (95%CI, 0.10–0.77, p = 0.014). By contrast, Cmin, ss > 336 ng/mL was not statistically associated with longer OS.
Conclusion
Early plasma drug monitoring may be useful to optimise cabozantinib treatment in mRCC patients treated in monotherapy, especially in frail patients starting at a lower than standard dose.
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Data availability
The datasets used and analysed during the current study are available from the corresponding author upon reasonable request.
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BB, AJ, JM, and YV designed the study. All authors participated in the collection and assembly of data. AJ performed the statistical analysis. BB, AJ, and YV drafted the manuscript. All authors revised the work, approved its final version, and agreed to be accountable for all its aspects.
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BB has received consulting and speaking fees (Bristol Myers Squibb, Clovis Oncology, Janssen, Pierre Fabre, Pfizer and Promise). SO has received honoraria (Sanofi, Pfizer, Bristol Myers Squibb, Eisai, Merck, Novartis, Ipsen, Astellas, Janssen and Bayer), travel and accommodation expenses (Sanofi, Pfizer, Bristol Myers Squibb, Eisai, Merck, Novartis, Ipsen, Astellas, Janssen and Bayer) and research grants (Sanofi, Astra Zeneca, Pfizer, Novartis, Janssen, Bayer and Roche). YV has received honoraria (Bristol Myers Squibb, Merck, Ipsen, Pfizer and Eisai) and research grants (Bristol Myers Squibb and Ipsen). CJ has received honoraria (Ipsen, Astellas, Bayer and Janssen). RF has received honoraria (Bayer, Astellas, Janssen, Ipsen, Merck, Bristol Myers Squibb, Pfizer and Merck). AP has received speaking fees (Bristol Myers Squibb and Pierre Fabre). LM has received honoraria (Sanofi, Astellas, Janssen, MSD, Bristol Myers Squibb, Ipsen, Astra Zeneca and Merck, Novartis) and travel and accommodation expenses (Sanofi, Astellas, Janssen, Bristol Myers, Ipsen, Astra Zeneca, Pfizer, MSD). LA has received honoraria (Novartis, Astellas, Janssen, MSD, Bristol Myers Squibb, Ipsen, Eisai, Pfizer and Merck, Roche) and travel and accommodation expenses (Bristol Myers Squibb, Ipsen, Pfizer, MSD). OH has received honoraria (Sanofi, Bayer, MSD, Bristol Myers Squibb, Ipsen, Pfizer, Eisai, Janssen, Astra Zeneca and Merck). XD has received consulting honoraria (Inflectis Biosciences, MedDay Pharmaceuticals, MAPREG and Merck). JM has received consulting honoraria (Daiichi Sankyo, Gilead, Lilly Eli, MSD and Pfizer) and travel and accommodation expenses (Lilly Eli, Gilead and Seattle Genetics).AXV, AJ, FP, DC, FLL, FT, MT, TP, CT, JC, EC, MV and FG declare no conflict of interest.
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The study was approved by the local ethics committee in oncology (CLEP number: AAA-2022–08055). Informed consent was obtained from all patients prior to inclusion.
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Blanchet, B., Xu-Vuilard, A., Jouinot, A. et al. Exposure-response relationship of cabozantinib in patients with metastatic renal cell carcinoma treated in routine care. Br J Cancer 130, 961–969 (2024). https://doi.org/10.1038/s41416-024-02585-y
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DOI: https://doi.org/10.1038/s41416-024-02585-y