Abstract
Purpose
This study examined whether the apoptosis-related protein, BAX, or the microsatellite-instability phenotype provide prognostic information in patients with resected colon cancer.
Methods
A total of 371 stage I–III patients that previously underwent radical surgery were included (mean follow-up 51.8 months). BAX expression was examined by immunohistochemical staining; high-frequency microsatellite instability (MSI+) was determined by assessing the specific marker, BAT26, using single-strand conformation polymorphism (SSCP)-based analysis.
Results
High BAX expression was found in 66.4% of patients. MSI+ tumors were observed in 14.8% of 344 patients. Univariate analysis showed that unlike MSI, low BAX expression was significantly correlated with poor disease-specific overall survival (OS) in stages I–III (p = 0.04). Multivariate subgroup analyses revealed that unlike MSI, low BAX was an independent predictor for OS in stage II (p = 0.009); however, in stages I or III, BAX or MSI were not independent predictors of OS.
Conclusions
In stage II colon cancer treated with surgery alone, BAX protein expression may be a predictor for prognosis.
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Acknowledgements
The last author is supported by a grant of the Deutsche Krebshilfe (702601) and the Interdisciplinary Center for Clinical Research Tübingen (IZKF IIIB2).
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Oliver Nehls and Holger G. Hass contributed equally to this work.
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Nehls, O., Hass, H.G., Okech, T. et al. Prognostic implications of BAX protein expression and microsatellite instability in all non-metastatic stages of primary colon cancer treated by surgery alone. Int J Colorectal Dis 24, 655–663 (2009). https://doi.org/10.1007/s00384-009-0635-0
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DOI: https://doi.org/10.1007/s00384-009-0635-0