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High expression of LAMP2 predicts poor prognosis in patients with esophageal squamous cell carcinoma.

BACKGROUND: LAMP2 is one of the major protein components of lysosome. In addition to the expression on the lysosomal membrane, LAMP2 has also been found relocalizing to the cell surface of some highly metastatic tumor cells.

OBJECTIVE: The aim of this study was to detect the expression levels of LAMP2 and discuss its roles in esophageal squamous cell carcinoma (ESCC).

METHODS: Six hundred and ten tissue samples of ESCC were collected to construct tissue microarrays, which were stained by immunohistochemistry.

RESULTS: After immunohistochemical staining, 596 patients including 460 men and 136 women were analyzed. The LAMP2 expression levels were significantly different based on degrees of histological differentiation (χ2= 108.906, P< 0.001). The similar results were also observed in TNM stages (χ2= 23.835, P< 0.01). LAMP2 expression levels negatively correlated with degrees of histological differentiation (P< 0.01). Logistic regression analysis showed that the LAMP2 expression levels were correlated with the degrees of histological differentiation (OR=

CONCLUSIONS: Our results demonstrated that LAMP2 expression levels correlated with tumor histological differentiation and TNM stages. High expression of LAMP2 predicts poor prognosis in patients with ESCC.

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