抑癌基因PTEN在人大肠癌中的表达及其意义

Expression and significance of tumor suppressor gene PTEN in colorectal cancer

目的阐明抑癌基因PTEN在大肠癌的发生发展及转移过程中的作用。方法应用Nothernblot和免疫组化的方法检测 4 7例人大肠癌及癌旁组织中PTENmRNA和蛋白的表达 ,分析其与大肠癌的临床病理学分期、分级及其与大肠癌肝转移的关系。结果 PTENmRNA在大肠癌组织内的表达水平显著低于相应的癌旁组织 ,在癌组织内 ,PTENmRNA表达水平与大肠癌的恶性程度分级、Dukes分期及血清中癌胚抗原 (CEA)水平呈显著负相关 ,PTEN蛋白在大肠癌旁组织中表达阳性率为 10 0 % ,在大肠癌组织中表达阳性率为 76 6 % ,PTEN在大肠癌组织中表达的降低与大肠癌的Dukes分期、淋巴结转移及血清中CEA水平呈显著负相关。

Objective To investigate the role of tumor suppressor gene PTEN in colorectal cancer. Methods Using Northern blot,immunohistochemistry, colorectal carcinoma was examined in 47 cases. ResultsKG1 The expression of PTEN mRNA in colorectal cancer was lower than that in paired para-carcinoma tissues( P <0 05). The expression level in carcinoma was correlated with serum CEA (carcinoembryonic antigen)value,tumor grade and clinical stage( P <0 05). The positive rate of PTEN protein was significantly correlated with serum CEA value and clinical stage( P <0 05)。Conclusion The deletion or lower expression of tumor suppressor gene PTEN may play a role in the development and matastasis of colorectal cancer.