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Objective: The purpose of this paper was to study the expression levels of newly described lymphatic endothelial markers – LYVE-1, Prox-1, podoplanin and 5’-nucleotidase, and their correlation with metastasis of human colorectal cancers. Methods: Tumor and corresponding tumor-side normal tissue samples were obtained from resected specimens immediately after operation. Expression level of each factor was determined by quantitative real-time PCR (RT-PCR) and Western blot technique. Results: Expression levels of lymphatic endothelial markers LYVE-1, Prox-1, podoplanin and 5’-nucleotidase were significantly different in tumor and tumor-side normal groups. Expression levels of Prox-1 and podoplanin were higher in patients with positive lymph node metastasis than those without metastasis. LYVE-1, but not 5’-nucleotidase expression level was higher in both cancer and normal groups. Conclusion: These results indicate that combined quantitative analysis of lymphangiogenic markers LYVE-1, Prox-1 and podoplanin in colorectal cancer specimens may be useful in predicting metastasis of colorectal cancer to regional lymph nodes. However, the role of 5’-nucleotidase in predicting metastasis of colorectal cancer still remains to be further analyzed.
Objective: The purpose of this paper was to study the expression levels of newly described lymphatic endothelial markers - LYVE-1, Prox-1, podoplanin and 5’-nucleotidase, and their correlation with metastasis of human colorectal cancers. Methods: Tumor, corresponding Tumor-side normal tissue samples were obtained from resected specimens immediately after operation. Expression level of each factor was determined by quantitative real-time PCR (RT-PCR) and Western blot technique. Results: Expression levels of lymphatic endothelial markers LYVE-1, Prox-1, podoplanin and 5’-nucleotidase were significantly different in tumor and tumor-side normal groups. Expression levels of Prox-1 and podoplanin were in higher with patients with positive lymph node metastasis than those without metastasis. LYVE-1, but not 5’-nucleotidase expression level was higher in both cancer and normal groups. Conclusion: These results indicate that combined quantitative analysis of lymphangiogenic markers LYVE-1 , Prox-1 and podoplanin in colorectal cancer specimens may be useful in predicting metastasis of colorectal cancer to regional lymph nodes. However, the role of 5’-nucleotidase in predicting metastasis of colorectal cancer still remains to be further analyzed.