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Objective To investigate the expression and clinical significance of endoplasmic reticulum protein 29(ERp29) in colorectal cancer. Methods Paraffin-embedded sections from 62 cases of colorectal cancer tissues were obtained and used for immunohistochemical staining of ERp29. The clinical and pathological data of various levels of ERp29 in patients with colorectal cancer were analyzed to determine if there was a significant difference. Results The expression of ERp29 in 62 cases of colorectal cancer tissues, 24(38. 7％ ) cases were positive and 38(61. 3％ )cases were negative. The expression of ERp29 in 62 cases of adjacent tissues, 58 (93. 5％ ) cases were positive and 4(6. 5％ ) cases were negative. There was a significant difference in TNM classification and lymph node metastasis between ERp29 positive group and ERp29 negative group (P ＜ 0. 05 ). Conclusion Colorectal cancer tissues have significantly lower levels of ERp29 than adjacent tissues. ERp29 may be helpful to evaluate the metastatic proclivity and prognosis of colorectal cancer.
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<p><b>OBJECTIVE</b>To evaluate the expression of FBXW7 in esophageal squamous cell carcinoma (ESCC) and to explore the correlation of FBXW7 expression with clinicopathologic features and prognosis of ESCC.</p><p><b>METHODS</b>Ninety cases of ESCC and twenty cases of tumor-adjacent normal tissues and forty intraepithelial neoplasia tissues were detected by immunohistochemistry methods. The expression of FBXW7 in 40 surgical ESCC tissues and tumor-adjacent normal tissues was detected by Western blotting and RT-PCR. The relationship between the expression of FBXW7, clinicopathological characteristics and prognosis was analyzed.</p><p><b>RESULTS</b>The positive rate of FBXW7 protein was significantly lower in the ESCC and high-grade intraepithelial neoplasia tissues than in the tumor-adjacent normal tissues and low grade intraepithelial neoplasia tissues (40.0% and 33.3% vs. 85.0% and 77.3%, χ² = 21.923, P < 0.001). The FBXW7 protein was down-regulated in ESCC tissues (P < 0.05), whereas the FBXW7 mRNA was down-regulated in ESCC tissues compared with that in the paracancerous tissues. The expression of FBXW7 was significantly correlated with TNM stage, degree of differentiation, invasion depth and lymph node metastasis (χ² =9.643, 14.908, 16.294, 10.222, respectively, P = 0.002, 0.001, 0.000, 0.001). In the ninety patients, the 5-year survival rates of cases with positive and negative expression of FBXW7 protein was 67.6% and 39.3%, respectively (χ² =6.699, P = 0.01).</p><p><b>CONCLUSIONS</b>The results of this study demonstrate that FBXW7 expression is significantly declined in ESCC and high grade intraepithelial neoplasia tissues, and is closely correlated with poor prognosis of this disease. FBXW7 as a tumor suppressor gene may play an important role in the carcinogenesis, development and metastasis of ESCC. These results suggest that FBXW7 may become a valuable marker for the severity and prognosis in ESCC.</p>