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Open Access Research article

Fibronectin 1 mRNA expression correlates with advanced disease in renal cancer

Sandra Waalkes1, Faranaz Atschekzei1, Mario W Kramer1, Jörg Hennenlotter2, Gesa Vetter1, Jan U Becker1, Arnulf Stenzl2, Axel S Merseburger1*, Andres J Schrader3, Markus A Kuczyk1 and Jürgen Serth1

Author Affiliations

1 Department of Urology, Hannover Medical School, Germany

2 Department of Urology, Eberhard Karls University Tuebingen, Germany

3 Department of Urology, Ulm University Medical School, Ulm, Germany

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BMC Cancer 2010, 10:503  doi:10.1186/1471-2407-10-503

Published: 22 September 2010

Abstract

Background

Fibronectin 1 (FN1) is a glycoprotein involved in cellular adhesion and migration processes. The aim of this study was to elucidate the role of FN1 in development of renal cell cancer (RCC) and to determine a prognostic relevance for optimal clinical management.

Methods

212 renal tissue samples (109 RCC, 86 corresponding tissues from adjacent normal renal tissue and 17 oncocytomas) were collected from patients undergoing surgery for renal tumors and subjected to total RNA extraction. Detection of FN1 mRNA expression was performed using quantitative real time PCR, three endogenous controls, renal proximal tubular epithelial cells (RPTEC) as biological control and the ΔΔCt method for calculation of relative quantities.

Results

Mean tissue specific FN1 mRNA expression was found to be increased approximately seven fold comparing RCC and corresponding kidney control tissues (p < 0.001; ANOVA). Furthermore, tissue specific mean FN1 expression was increased approx. 11 fold in clear cell compared to papillary RCC (p = 9×10-5; Wilcoxon rank sum test). Patients with advanced disease had higher FN1 expression when compared to organ-confined disease (p < 0.001; Wilcoxon rank sum test). Applying subgroup analysis we found a significantly higher FN1 mRNA expression between organ-confined and advanced disease in the papillary and not in the clear cell RCC group (p = 0.02 vs. p = 0.2; Wilcoxon rank sum test). There was an increased expression in RCC compared to oncocytoma (p = 0.016; ANOVA).

Conclusions

To our knowledge, this is the first study to show that FN1 mRNA expression is higher in RCC compared to normal renal tissue. FN1 mRNA expression might serve as a marker for RCC aggressiveness, indicating early systemic progression particularly for patients with papillary RCC.