Abstract
Background
The number of studies evaluating the efficacy and safety of third-line molecular-targeted therapy for metastatic renal cell carcinoma (mRCC) is limited.
Methods
The data for 48 patients with disease progression after first-line vascular endothelial growth factor receptor tyrosine kinase inhibitor (TKI) and second-line targeted therapy were evaluated. Patients with prior cytokine therapy were excluded. Overall survival (OS) after first- and second-line therapy initiation was compared between patients with and without third-line therapy. In addition, dose-limiting toxicities (DLTs) were evaluated.
Results
Twenty-two of 48 patients (45.8%) received third-line therapy, and TKI and mammalian target of rapamycin inhibitor were each administered in 11 patients (50%). Patients with third-line therapy had significantly longer median OS after first-line therapy (26.6 vs. 14.6 months, p = 0.0010) and second-line therapy (18.2 vs. 7.4 months, p < 0.0001) compared to those without third-line therapy. Multivariate analysis showed that the use of third-line therapy following second-line therapy was an independent prognosticator for longer OS (hazard ratio 0.29, 95% confidence interval 0.14–0.58, p = 0.0005). The median progression-free survival and OS after third-line therapy was 2.76 and 8.71 months, respectively. Although a high frequency of DLTs was observed (n = 10, 45.5%), the frequencies were similar among the sequential therapies.
Conclusions
Third-line therapy has a beneficial therapeutic effect in patients with mRCC that is resistant to previous therapies. However, there is a need to evaluate in detail the high frequency of adverse events, including DLTs.
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Acknowledgements
The authors thank Editage for English language editing and Nobuko Hata for secretarial support.
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Tsunenori Kondo received honoraria from Pfizer, Bayer, and Novartis. None of the other authors have any conflicts of interest to declare.
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Fig.
S1a–b. Overall survival after first- and second-line therapy according to the use of third-line therapy in 34 patients with a diagnosis of clear-cell carcinoma. Patients with third-line therapy (n = 16) had a significantly longer overall survival after first- and second-line therapy than those without third-line therapy. a Median overall survival after first-line therapy: 30.6 vs. 18.5 months, p = 0.0110. b Median overall survival after second-line therapy: 21.8 vs. 8.34 months, p = 0.0013. (TIFF 138 kb)
Fig.
S2. Waterfall plot analysis. The waterfall plot analysis shows the objective response rate according to the third-line agents used in each patient. mTORi mammalian target of rapamycin inhibitor (TIFF 69 kb)
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Ishihara, H., Takagi, T., Kondo, T. et al. Efficacy and safety of third-line molecular-targeted therapy in metastatic renal cell carcinoma resistant to first-line vascular endothelial growth factor receptor tyrosine kinase inhibitor and second-line therapy. Int J Clin Oncol 23, 559–567 (2018). https://doi.org/10.1007/s10147-018-1241-3
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DOI: https://doi.org/10.1007/s10147-018-1241-3