Abstract
Purpose
Estrogen receptor β (ERβ) is abundantly expressed in colorectal tissue, but its role in colorectal carcinogenesis remains elusive. Estrogen receptor coregulators, amplified in breast cancer 1 (AIB1) and transcription intermediary factor 2 (TIF2), have been well-characterized, but their expression in colorectal carcinomas has not been investigated.
Materials and methods
Estrogen receptor α (ERα), ERβ, AIB1, and TIF2 protein expression were evaluated by immunohistochemistry in colorectal normal mucosa, adenomas, and adenocarcinomas from 110 patients with colorectal cancer.
Results
ERα expression was rare in colorectal tissue and its expression does not appear to be associated with colorectal carcinogenesis. ERβ, AIB1, and TIF2 were detected in the nucleus of epithelial, endothelial, inflammatory, smooth muscle cells, and myofibroblasts. The expression of the three proteins was significantly increased in epithelial cells of carcinomas compared to normal mucosa. In carcinomas, a significant correlation between the levels of expression of AIB1 and TIF2 was noted. Although AIB1 overexpression was associated with local tumor invasion, it was also found to correlate independently with prolonged overall survival.
Conclusions
ERβ, AIB1, and TIF2 appear to be involved in colorectal tumorigenesis and might have prognostic significance.
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Acknowledgements
We acknowledge the Committee of Research, University of Patras, Greece for the funding of our study. Study sponsors had no involvement in the study design, in the collection, analysis and interpretation of data; in the writing of the manuscript; and in the decision to submit the manuscript for publication.
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Grivas, P.D., Tzelepi, V., Sotiropoulou-Bonikou, G. et al. Estrogen receptor α/β, AIB1, and TIF2 in colorectal carcinogenesis: do coregulators have prognostic significance?. Int J Colorectal Dis 24, 613–622 (2009). https://doi.org/10.1007/s00384-009-0647-9
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DOI: https://doi.org/10.1007/s00384-009-0647-9