Abstract
Background
It is controversial whether chromophobe renal cell carcinoma (chRCC) or clear cell renal cell carcinoma (ccRCC) is associated with better survival. We conducted a clinical-based cohort study and meta-analysis to evaluate the prognostic role of histology between chRCC and ccRCC.
Methods
A cohort of 1540 patients (166 with chRCC and 1374 with ccRCC) were selected from Sun Yat-sen University and The Cancer Genome Atlas databases. The clinicopathological parameters and overall survival (OS) were compared between patients with chRCC and those with ccRCC. For the meta-analysis, we searched the PubMed, Cochrane Library, and Ovid databases for studies comparing OS or cancer-specific survival (CSS) between chRCC and ccRCC.
Results
The cohort study revealed that patients with chRCC were younger (median 52 vs. 55 years, P < 0.001), were more commonly female (47.0 vs. 33.0 %, P < 0.001), and had a larger tumor size (mean 7.1 vs. 5.9 cm, P < 0.001), and they had a lower stage compared with those with ccRCC. Five-year OS rates for chRCC and ccRCC were 90.3 and 75.3 %, respectively (P < 0.001). We found significantly better survival for chRCC in stratification analysis by age, sex, tumor size, and stage. Similar results were observed on both univariate [hazard ratio (HR), 0.30; 95 % confidence interval (CI) 0.16–0.55, P < 0.001] and multivariate analyses (HR 0.42; 95 % CI 0.23–0.79, P = 0.006). Ten studies were included in our meta-analysis. Eight of them provided data on univariate analysis. The pooled HR was statistically significant for OS (pooled HR 0.49; 95 % CI 0.30–0.79, P = 0.004) and CSS (pooled HR 0.49; 95 % CI 0.37–0.64, P < 0.001). Seven studies reported the HR on multivariate analysis. The pooled HR was also statistically significant for OS (pooled HR 0.63; 95 % CI 0.51–0.77, P < 0.001) and CSS (pooled HR 0.72; 95 % CI 0.57–0.90, P = 0.003). These data indicate that patients with chRCC had better outcomes than those with ccRCC.
Conclusions
Our large cohort study and meta-analysis confirmed that chRCC had better survival than ccRCC.
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Acknowledgments
This work was supported by National Natural Science Foundation of China (Nos. 81172429, 81372357, U1301221, 81372730, and 81225018) and the Guangdong Provincial Science and Technology Foundation (No. 2013B021800133).
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Hui-Ming Jiang and Jin-Huan Wei have contributed equally to this work.
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Jiang, HM., Wei, JH., Zhang, ZL. et al. Does chromophobe renal cell carcinoma have better survival than clear cell renal cell carcinoma? A clinical-based cohort study and meta-analysis. Int Urol Nephrol 48, 191–199 (2016). https://doi.org/10.1007/s11255-015-1161-3
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DOI: https://doi.org/10.1007/s11255-015-1161-3