Objective: To study the expression and the clinical significance of LEA in colorectal carcinoma. Methods: Immunohistochemistry S-P method to detect the expression of LEA and CEA in 140 colorectal cancer specimens and 100 non-cancerous colorectal specimens. Results: The expression of LEA is relative to tumor differentiation degree and exhibits higher selectivity in well-differentiated adeno-carcinoma (P0.05). Compared with CEA, the expression of LEA has lower positive rate in non-cancerous tissue (P<0.05). The positive rate of LEA in adenoma is much higher than surrounding non-cancerous mucosa and normal mucosa. In normal mucosa the positive rate of LEA is obviously lower than that of CEA (P<0.05). The expression of LEA and CEA has similar rule except in normal mucosa. In histological diagnosis of colorectal cancer the sensitivity of LEA is 82.9% and the specificity is 48%, while the sensitivity of CEA is 88.6% and the specificity is 35%. Conclusion: The expression of LEA is related to the differentiation degree of colorectal cancer tissue. LEA can be used as an auxiliary index for early diagnosis and a reference for the judgment of the malignancy degree of colorectal carcinoma, thus may be a new tumor marker with applicable clinic value.
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