Abstract
Purpose
To determine the differential expression patterns and prognostic relevance of Mucin-1 (MUC1) expression in clear cell renal cell carcinoma (RCC) metastasis.
Methods
Tissue microarrays (TMA) from samples of 151 RCC metastases, 61 primary RCCs and corresponding benign renal tissues were immunohistochemically stained for MUC1 and semi-quantitatively evaluated by immunoreactivity scores (IRS). MUC1 differential expression in metastasis, primary RCC and normal tissue were comparatively analyzed. Patient characteristics and clinical follow-up for patients with metastatic RCC (mRCC) were recorded. Correlations of MUC1 expression with mRCC survival were determined.
Results
Median cytoplasmic expression was highest in benign tissue (IRS = 1.04). Primary RCC (0.50) and metastasis (0.12) showed significantly lower cytoplasmic staining intensity. Membranous expression in benign tissue was, however, significantly lower (0.21) compared with primary RCC (0.59) and metastasis (0.57). Notable differences of MUC1 cytoplasmic and membranous expression were observed between different metastasis sites. Significantly higher (P = 0.014) membranous expression was observed in pulmonary versus non-pulmonary lesions, while no significant differences of cytoplasmic MUC1 expression were observed. The prognostic relevance of MUC1 expression in metastatic RCC was limited.
Conclusions
MUC1 is differentially expressed in benign renal tissue, primary RCC and RCC metastasis. Membranous MUC1 expression was significantly elevated in pulmonary metastases compared to non-pulmonary lesions, which may reflect individual biology and putative response to MUC1-based anti-cancer therapy.
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Acknowledgments
We thank Claudia Hermann, Department of Pathology, University of Tübingen for technical assistance with the immunohistochemical analysis. SR is supported by a Fernidand-Eisenberger-Grant of the German Society of Urology (RaS1/FE-14).
Authors’ contributions
Steffen Rausch, Stephan Kruck, and Jens Bedke contributed to conception and design, data collection, data analysis, and manuscript writing/editing. Jörg Hennenlotter was involved in conception and design, collection of samples, data analysis. Daniel Schollenberger, Johanna Beermann, and Marcus Scharpf collected and analyzed the data. Arnulf Stenzl and Falko Fend supervised the study.
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Steffen Rausch, Johanna Beermann, Marcus Scharpf, Jörg Hennenlotter, Falko Fend, Arnulf Stenzl, Daniel Schollenberger, Jens Bedke, and Stephan Kruck declare that no competing financial interests exist.
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Supplementary Figure 1
A. Cytoplasmic expression patterns and immunoreactivity scores (0.0-3.0) of MUC1(200x magnification) B. Membranous expression patterns and immunoreactivity scores (0.0-3.0) of MUC1 (200x magnification) (DOCX 4941 kb)
Supplementary Figure 2
Kaplan-Meier survival curves in dependence of cytoplasmic, membranous, and overall MUC1 expression in primary RCC (A-C) and RCC metastasis (D-F) cohorts (DOCX 325 kb)
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Rausch, S., Beermann, J., Scharpf, M. et al. Differential expression and clinical relevance of MUC1 in renal cell carcinoma metastasis. World J Urol 34, 1635–1641 (2016). https://doi.org/10.1007/s00345-016-1804-8
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DOI: https://doi.org/10.1007/s00345-016-1804-8