上皮细胞黏附分子表达与乳腺癌淋巴结转移的相关性

目的 探讨上皮细胞黏附分子(Ep-CAM)在乳腺癌中的表达及意义.方法 收集经病理学确诊的乳腺癌新鲜组织标本23例及配对的淋巴结转移灶.应用同位素标记的相对和绝对定量(iTRAQ)蛋白质组学技术筛选及鉴定乳腺癌原发灶和淋巴结转移灶的差异表达蛋白,在4例新鲜乳腺癌原发灶组织和配对淋巴结转移灶中进行Western blotting检测Ep-CAM的表达.采用免疫组织化学法检测252例乳腺病变标本中Ep-CAM的表达.结果 定量蛋白质组学检测结果显示乳腺癌原发灶和淋巴结转移灶存在差异表达蛋白,其中Ep-CAM在转移灶的表达高于原发灶,Western blotting显示Ep-CAM在转移灶的表达(1.46±0.22)高于原发灶(1.16±0.09),变化趋势与蛋白质组学结果一致.免疫组织化学检测结果显示,Ep-CAM在淋巴结转移灶中的阳性表达率(93.16％,109/117)显著高于无淋巴结转移的乳腺癌原发灶(72.73％,64/88),差异有统计学意义(x2=15.921,P=0.000);有淋巴结转移的乳腺癌原发灶Ep-CAM阳性表达率为72.65％(85/117),较配对淋巴结转移灶阳性表达率低,差异有统计学意义(P=0.001).结论 Ep-CAM在乳腺癌原发灶和淋巴结转移灶呈差异表达,该蛋白可能与乳腺癌淋巴结转移有关.

Correlation of expression of epithelial cell adhesion molecule and lymph node metastasis of breast cancer

Objective To investigate the expression and significance of epithelial cell adhesion molecule (Ep-CAM) in breast cancer.Methods Twenty-three cases of breast cancer tissue samples and paired lymph node metastases confirmed pathologically were collected.Isobaric tags for relative and absolute quantitation (iTRAQ) proteomics technology was used to screen and identify the differentially expressed proteins between primary tumor and lymph node metastasis of breast cancer.The expression of Ep-CAM was detected by Western blotting in 4 cases of primary breast cancer tissues and paired lymph node metastases.And the expressions of Ep-CAM in 252 cases of breast lesions were detected by immunohistochemical method.Results Quantitative proteomic examination results showed that differentially expressed proteins existed in breast cancer primary tumor and lymph node metastasis,and the expression of Ep-CAM in metastatic lesions was higher than that in primary tumor.Western blotting results showed that the expression of Ep-CAM in metastatic lesions (1.46 ± 0.22) was higher than that in primary tumor (1.16 ± 0.09),which was consistent with the results of proteomic.The immunohistochemical results showed that the positive expression rate of Ep-CAM in lymph node metastasis tissues (93.16％,109/117) was significantly higher than that in primary breast cancer without metastasis (72.73％,64/88),and the difference was statistically significant (x2 =15.921,P =0.000).The positive expression rate of Ep-CAM in primary breast cancer with lymphatic metastasis (72.65％,85/117) was lower than that in paired lymph node metastases (P =0.001).Conclusion Ep-CAM is differentially expressed in primary tumor and lymph node metastasis of breast cancer,which may be related to the lymphatic metastasis of breast cancer.