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Tissue Concentration of Platelet-Derived Endothelial Cell Growth Factor in Colorectal Cancer

Background: Angiogenesis is essential for the continuous growth of tumour cells under unfavourable conditions in patients. Experimentally, platelet-derived endothelial cell growth factor (PD-ECGF) promotes tumour proliferation by stimulating angiogenesis. However, the clinical significance and regulating mechanism of its production in colorectal cancer are not well understood. Methods: The tissue concentration of PD-ECGF in colorectal neoplasm and normal mucosa was determined. The systemic oxygenation and nutritional status of the patients were also evaluated. Results: The mean concentration of PD-ECGF in the cancer was significantly higher than that in the normal mucosa or adenoma. The tissue concentration of PD-ECGF in the cancer was associated with the clinicopathologic findings, including the tumour size, serosal invasion, lymphatic vessel involvement, and lymph node metastasis. It was also correlated with the patient's age, levels of PO2 and O2 saturation in arterial blood, and the variables reflecting nutritional status. The multivariate regression model showed that the serum concentration of cholinesterase, the arterial level of PO22, lymph node metastasis, and the tumour size were the independent factors that influenced the tissue concentration of PD-ECGF in colorectal cancer. In contrast, these factors were not associated with the PD-ECGF concentration in normal mucosa. Conclusions: PD-ECGF may play an important role in the progression of colorectal cancer. Systemic deterioration of oxygenation and nutritional condition in wasted patients may also lead to local activation of PD-ECGF specifically in the cancer tissue. PD-ECGF may be indispensable for maintaining relentless growth of colorectal cancer, and the control of its expression may be of therapeutic importance.