Published in:
01-09-2020 | Prostate Cancer | Original Article
Claudin-1 upregulation is associated with favorable tumor features and a reduced risk for biochemical recurrence in ERG-positive prostate cancer
Authors:
Simon Kind, Franziska Büscheck, Doris Höflmayer, Claudia Hube-Magg, Martina Kluth, Maria Christina Tsourlakis, Stefan Steurer, Till S. Clauditz, Andreas M. Luebke, Eike Burandt, Waldemar Wilczak, Andrea Hinsch, David Dum, Sören Weidemann, Christoph Fraune, Burkhard Beyer, Thomas Steuber, Hartwig Huland, Markus Graefen, Margit Fisch, Ronald Simon, Guido Sauter, Thorsten Schlomm, Sarah Minner, Till Eichenauer
Published in:
World Journal of Urology
|
Issue 9/2020
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Abstract
Background
Claudin-1 is a membrane-tight junction protein and important for the sealing of the paracellular cleft in epithelial and endothelial cells. Differential expression of Claudin-1 is linked to disease outcome in various cancers.
Material and methods
To evaluate the potential relevance of Claudin-1 expression in prostate cancer, a tissue microarray containing samples of 17,747 tumors with annotated clinico-pathological and molecular data was immunohistochemically analyzed for Claudin-1 expression.
Results
In normal prostate, glandular cells were always Claudin-1-negative while there was a strong staining of gland-surrounding basal cells. In contrast to normal prostatic glands, a positive Claudin-1 immunostaining, was found, however, in 38.7% of 12,441 interpretable cancers and was considered weak in 12.7%, moderate in 13.2%, and strong in 12.8% of cases. Positive Claudin-1 immunostaining was associated with favorable tumor features like low pT (p = 0.0032), low Gleason grade (p< 0.0001), and a reduced risk of PSA recurrence (p = 0.0005). A positive Claudin-1 staining was markedly more frequent in ERG-positive (63%) than in ERG-negative cancers (23%; p < 0.0001). Subset analyses revealed that all associations of Claudin-1 expression and favorable phenotype and prognosis were driven by ERG-positive cancers. Multivariate analyses revealed, however, that even in ERG-positive cancers, the prognostic impact of high Claudin-1 expression was not independent of established clinico-pathological parameters. Comparison with 12 previously analyzed chromosomal deletions identified conspicuous associations with PTEN and 12p13 deletions potentially indicating functional interactions.
Conclusion
These data identify a peculiar role for Claudin-1 in prostate cancer. The protein is overexpressed in a fraction of prostate cancers and increased Claudin-1 expression levels predict a favorable prognosis in ERG-positive cancer.