Cabozantinib in the treatment of metastatic renal cell carcinoma – final data analysis from four oncology centers in the Czech Republic

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Authors: I.- Richter ^{1 3}; A. Poprach ⁴; A. Zemánková ⁵; T. Büchler ²; J. Bartoš ¹; V. Šámal ⁶; H. Študentová ⁵; A. Rozsypalová ²; J. Dvořák ²; O. Brom ⁷; B. Melichar ⁵
Authors‘ workplace: Onkologické oddělení, KN Liberec, a. s. ¹; Onkologická klinika 1. LF UK a FTN Praha ²; Fakulta zdravotnických studií, TU Liberec ³; Klinika komplexní onkologické péče LF MU a MOÚ Brno ⁴; Onkologická klinika LF UP a FN Olomouc ⁵; Urologické oddělení, KN Liberec, a. s. ⁶; ACREA Česká republika ⁷
Published in: Klin Onkol 2021; 34(5): 392-400
Category: Original Articles
doi: https://doi.org/10.48095/ccko2021392

Overview

Background: Current standard treatments for patients with metastatic renal cell carcinoma (mRCC) involve tyrosine kinase inhibitors (TKI) that inhibit angiogenesis. Cabozantinib is a multi TKI used for the treatment of mRCC in the first- and second-line setting. Purpose: The aim of this study was the final analysis of treatment outcomes in patients with metastatic renal cell carcinoma (mRCC) treated with cabozantinib after previous targeted therapy. Patients and methods: A total of 54 patients with mRCC from four oncology centers in the Czech Republic were evaluated retrospectively; the median follow-up was 18.5 months. Cabozantinib was administered in a dose of 60 mg/day, a subset of patients received an initial dose of 40 mg/day. The treatment was administered until the progression. The Kaplan-Meier analysis was used to calculate progression free survival (PFS) and overall survival (OS). We performed a multivariate analysis of risk factors for treatment outcomes (PFS, OS) by regression analysis. All statistics were evaluated at the significance level α = 0.05. Results: The median PFS in all patients was 9.3 months (95% CI 7.2 – 11.4). The median OS in all patients was 21.9 months (95% CI 15.5 – 28.4). The median PFS in patients with bone metastases was not statistically significantly different compared with patients without bone metastases (9.3 vs 8.7 months, P = 0.53). The median OS in patients with bone metastases was statistically significantly shorter compared with patients without bone metastases (17.7 vs 26.8 months, P = 0.021). A treatment response was observed in 40.7 % of cases, including one complete remission. The regression analysis demonstrated a significant effect on OS in patients with the presence of subsequent treatment (P = 0.001), patients with treatment duration of first line therapy ≥ 6 months (P = 0.019) and ≥ 12 months (P = 0.003) and in patients without bone metastases (P = 0.021). Conclusion: Our final analysis of patients with mRCC treated with cabozantinib after previous targeted therapy confirmed its effectiveness.

Keywords:

renal carcinoma – metastases – cabozantinib – targeted treatment – treatment results

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