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Erschienen in:
01.07.2009
Overexpression and Interactions of Interleukin-10, Transforming Growth Factor β, and Vascular Endothelial Growth Factor in Esophageal Squamous Cell Carcinoma
Erschienen in: World Journal of Surgery | Ausgabe 7/2009
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Background
Sharing the role of immune suppression, interleukin-10 (IL-10), transforming growth factor β (TGF-β), and vascular endothelial growth factor (VEGF) are critical genes in several aspects of tumorigenesis. To elucidate the role of these cytokines in esophageal squamous cell carcinoma (ESCC), their relative mRNA expression in tumoral tissue compared with corresponding tumor-free tissue was evaluated.
Methods
A total of 49 patients with histologically confirmed ESCC were included in the study prior to any therapeutic interventions. Quantitative analysis of the mRNA expression was performed by real-time reverse transcription-polymerase chain reaction and the clinicopathologic associations were assessed.
Results
The mRNA of IL-10, VEGF, and TGF-β was frequently overexpressed in 53.2%, 44.9%, and 37.5% of ESCC patients, respectively. TGF-β was significantly co-expressed with IL-10 and with VEGF. Although VEGF was not independently associated with increased tumor size (p = 0.065), concomitant overexpression of VEGF with TGF-β was significantly correlated with increased size of the tumor (p < 0.05).
Conclusions
Overexpression of IL-10, TGF-β, and VEGF plays an important role in ESCC and consequently leads to the frequent event of immune evasion in ESCC. TGF-β is concomitantly overexpressed with IL-10 and with VEGF in ESCC. A stimulatory signal from TGF-β to VEGF is necessary for VEGF to promote tumor progression.