胆管癌中抑癌基因PTEN的表达及其与P53表达相关性的研究

目的研究PTEN和P53蛋白在胆管癌中的表达情况、相互关系及其临床病理学意义。方法应用免疫组化SP法对36例胆管癌标本，8例正常胆管组织和30例胆管癌旁组织中PTEN及P53蛋白表达情况进行研究。结果胆管癌中PTEN蛋白的阳性表达率为63.89％（23/36），明显低于正常胆管组织（100％，8/8）和癌旁组织（100％，30/30）；其表达与胆管癌的分化程度及有无转移有关而与部位无关。P53蛋白在胆管癌中的阳性表达率为44.44％（16/36），明显高于正常胆管组织（0％，0/8）和癌旁组织（0％，0/30）；其表达与胆管癌的分化程度有关而与部位及有无转移无关。胆管癌中PTEN与P53蛋白表达具有相关性。结论PTEN蛋白在胆管癌中表达下降，并且其表达与胆管癌的分化程度及有无转移有关而与肿瘤部位无关。P53蛋白在胆管癌中表达升高，其表达与胆管癌的分化程度有关而与肿瘤部位及有无转移无关。胆管癌中PTEN与P53蛋白表达具有相关性。

The Study of Tumor Suppressor Gene PTEN Expression and Its Correlation with the P53 Expression in Cholangiocarcinoma

Objective To investigate the expressions of phosphatase and tensin homolog deleted on chromosome 10(PTEN) and P53 protein in cholangiocarcinoma and evaluate their possible relationship and clinical significance. Methods The expressions of PTEN and P53 in 36 cases of cholangiocarcinoma, eight cases of normal biliary duct and 30 cases of para-neoplastic tissue were detected by S-P immunohistochemistry method. Results The positive rate of PTEN protein expression was 63.89%(23/36) in cholangiocarcinoma, which was significantly lower than that in normal biliary duct (100%,8/8) and that in para-neoplastic tissue(100%,30/30), and which had no relationship with tumor locus, but was significantly correlated with the degree of differentiation and metastasis. The positive rate of P53 protein expression was 44.44%(16/36) in cholangiocarcinoma, which was significantly higher than that in normal biliary duct( 0%, 0/8) and that in para-neoplastic tissue (0%, 0/30), and it had no relationship with tumor locus and metastasis,but was significantly correlated with the degree of differentiation. The PTEN protein expression had correlation with the expression of P53. Conclusion The expression of PTEN protein was significantly lower in cholangiocarcinoma and significantly correlated with the degree of differentiation and metastasis other than the locus of tumor. The expression of P53 protein was associated with the degree of differentiation, but not with the tumor locus and metastasis. Moreover, The PTEN protein expression had correlation with the P53 expression.