Abstract
Background
We evaluated the influence of serum cystatin C (CysC) with respect to other glomerular filtration rate (GFR) markers on the treatment effect of everolimus in a phase II study in patients with metastatic renal cell carcinoma (mRCC).
Materials and methods
Outcomes were from the study’s primary analysis. GFR was calculated according to CKD-EPI-sCr equation, CKD-EPI-CysC equation and CKD-EPI-sCr-CysC equation, Modification of Diet in Renal Disease (MDRD) equation and Cockcroft–Gault (CG) equation, serum levels of creatinine (sCr) and CysC before the treatment.
Results
We observed in 56 patients analysed patients high correlation (R Spearman from ±0.69 to ±1.00; P < 0.0001) between CysC level and GFR markers: sCr, CKD-EPI-sCr, CKD-EPI-CysC, CKD-EPI-sCr-CysC, MDRD, GFR (CG) before everolimus therapy. We observed that the adverse independent predictors for everolimus therapy were increased CysC level [HR: 2.85 (95 % CI 1.34–6.05), P = 0.0065], histologic grade G1/2 [HR: 3.38 (95 % CI 1.59–7.20), P = 0.0016] and increased LDH level [HR: 5.59 (95 % CI 2.52–12.40), P < 0.0001]. Worse OS was seen in multivariate analysis in patients with increased cystatin C level before treatment [HR: 2.60 (1.03–2.60), P = 0.0428], increased corrected calcium level [HR: 2.78 (95 % CI 1.03–7.54), P = 0.0441] and increased LDH level before treatment [HR: 2.34 (95 % CI 1.11–4.97), P = 0.0262].
Conclusion
Increased serum CysC level in contrast to other studied GFR markers had predictive significance in patients with mRCC.
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Funding
This study was supported by the Polish Ministry of Science and Higher Education (grant number N N402 455139).
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The authors have declared no conflicts of interest.
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This study was approved by the Institutional Review Board of the Military Institute of Medicine in Warsaw (16 December 2009; No 54/WIM/2009).
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Written informed consent was obtained from all patients.
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Bodnar, L., Stec, R., Dzierżanowska, M. et al. Cystatin C as a predictor factor in patients with renal cell carcinoma treated by everolimus. Cancer Chemother Pharmacol 78, 295–304 (2016). https://doi.org/10.1007/s00280-016-3084-9
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DOI: https://doi.org/10.1007/s00280-016-3084-9