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Open Access 01-12-2011 | Research article

Decreased expression of dual-specificity phosphatase 9 is associated with poor prognosis in clear cell renal cell carcinoma

Authors: Song Wu, Yong Wang, Liang Sun, Zhiling Zhang, Zhimao Jiang, Zike Qin, Hui Han, Zhuowei Liu, Xianxin Li, Aifa Tang, Yaoting Gui, Zhiming Cai, Fangjian Zhou

Published in: BMC Cancer | Issue 1/2011

Abstract

Background

The molecular mechanisms involved in the development and progression of clear cell renal cell carcinomas (ccRCCs) are poorly understood. The objective of this study was to analyze the expression of dual-specificity phosphatase 9 (DUSP-9) and determine its clinical significance in human ccRCCs.

Methods

The expression of DUSP-9 mRNA was determined in 46 paired samples of ccRCCs and adjacent normal tissues by using real-time qPCR. The expression of the DUSP-9 was determined in 211 samples of ccRCCs and 107 paired samples of adjacent normal tissues by immunohistochemical analysis. Statistical analysis was performed to define the relationship between the expression of DUSP-9 and the clinical features of ccRCC.

Results

The mRNA level of DUSP-9, which was determined by real-time RT-PCR, was found to be significantly lower in tumorous tissues than in the adjacent non-tumorous tissues (p < 0.001). An immunohistochemical analysis of 107 paired tissue specimens showed that the DUSP-9 expression was lower in tumorous tissues than in the adjacent non-tumorous tissues (p < 0.001). Moreover, there was a significant correlation between the DUSP-9 expression in ccRCCs and gender (p = 0.031), tumor size (p = 0.001), pathologic stage (p = 0.001), Fuhrman grade (p = 0.002), T stage (p = 0.001), N classification (p = 0.012), metastasis (p = 0.005), and recurrence (p < 0.001). Patients with lower DUSP-9 expression had shorter overall survival time than those with higher DUSP-9 expression (p < 0.001). Multivariate analysis indicated that low expression of the DUSP-9 was an independent predictor for poor survival of ccRCC patients.

Conclusion

To our knowledge, this is the first study that determines the relationship between DUSP-9 expression and prognosis in ccRCC. We found that decreased expression of DUSP-9 is associated with poor prognosis in ccRCC. DUSP-9 may represent a novel and useful prognostic marker for ccRCC.

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The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2407/11/413/prepub

Title: Decreased expression of dual-specificity phosphatase 9 is associated with poor prognosis in clear cell renal cell carcinoma
Authors: Song Wu
Yong Wang
Liang Sun
Zhiling Zhang
Zhimao Jiang
Zike Qin
Hui Han
Zhuowei Liu
Xianxin Li
Aifa Tang
Yaoting Gui
Zhiming Cai
Fangjian Zhou
Publication date: 01-12-2011
Publisher: BioMed Central
Published in: BMC Cancer / Issue 1/2011
Electronic ISSN: 1471-2407
DOI: https://doi.org/10.1186/1471-2407-11-413

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