Abstract
Background
The aim was to investigate the relationships between total sunitinib plasma concentrations (sunitinib plus its active metabolite; N-desethyl sunitinib) and clinical outcomes in Japanese patients with metastatic renal cell carcinoma (mRCC).
Methods
Twenty patients with mRCC were enrolled following treatment with sunitinib. To assess safety, the total sunitinib concentration range up to discontinuation of treatment and dosage reduction associated with adverse events within 6 weeks from initiating administration were analyzed. The longest administered sunitinib dosage was defined as the maintenance dose, and the relationship between total sunitinib concentration at the maintenance dosage and sunitinib efficacy was investigated.
Results
Total sunitinib concentration was significantly higher in patients who discontinued treatment or had dosage reduction due to adverse events within 6 weeks after initiation of sunitinib than in patients who continued treatment with the initial dosage. The time to treatment failure, progression-free survival, and overall survival were better in patients with total sunitinib concentrations < 50 ng/mL than in those with concentrations ≥ 50 ng/mL.
Conclusions
The present study demonstrated that the effective range of total sunitinib concentration in Japanese patients with mRCC was lower than 50–100 ng/mL which was previously reported. These results indicate that therapeutic drug monitoring could maintain the therapeutic effect of sunitinib while minimizing adverse events by personalizing sunitinib dosages for Japanese patients with mRCC.
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Abbreviations
- mRCC:
-
Metastatic renal cell carcinoma
- TKI:
-
Tyrosine kinase inhibitor
- VEGFR:
-
Vascular endothelial growth factor receptor
- PDGFR:
-
Platelet-derived growth factor receptor
- PFS:
-
Progression-free survival
- TDM:
-
Therapeutic drug monitoring
- PK:
-
Pharmacokinetics
- PD:
-
Pharmacodynamics
- LC-MS/MS:
-
Liquid chromatography ionization tandem mass spectrometry
- TTF:
-
Time to treatment failure
- ABCG2:
-
ATP-binding cassette sub-family G member 2
- ABCB1:
-
ATP-binding cassette sub-family B member 1
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Acknowledgements
The authors would like to thank all of the patients and the expert urology nurses and the skillful pharmacists in Tohoku University Hospital who were involved in this study.
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Takasaki, S., Kawasaki, Y., Kikuchi, M. et al. Relationships between sunitinib plasma concentration and clinical outcomes in Japanese patients with metastatic renal cell carcinoma. Int J Clin Oncol 23, 936–943 (2018). https://doi.org/10.1007/s10147-018-1302-7
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DOI: https://doi.org/10.1007/s10147-018-1302-7