人胃癌PGP9.5的表达及其临床意义

Expression and Clinical Significance of Protein Gene Product 9.5 in Human Gastric Cancer

目的研究蛋白基因产物9.5(proteingeneproduct9.5,PGP9.5)在人胃癌组织中的表达,并探讨其与胃肿瘤的发生、发展和侵袭、转移的关系。方法采用免疫组织化学SP法和Westernblot法检测80例胃癌及8例正常胃组织中PGP9.5的表达。结果在80例胃癌组织中有56例(70.0%)表达PGP9.5,而正常胃上皮细胞中无PGP9.5表达;Westernblot检测结果与免疫组化结果一致。SP法显示PGP9.5的表达和胃癌的浸润深度、分化程度及有无淋巴结转移有关(P<0.05),与患者年龄、性别、胃癌的组织学类型及TNM分期无关(P>0.05)。结论PGP9.5在胃癌侵袭及转移过程中可能发挥重要作用,检测PGP9.5表达可作为肿瘤组织侵袭胃的一个分子标志物。

Objective To investigate the expression of protein gene product 9.5 （PGP9.5） in human gastric cancer, and to find out the relations between its expression and carcinogenesis, invasion and metastasis of gastric cancer. Methods The expression of PGP9.5 was detected by immunohistochemistry （SP） and Western blot in 80 samples of gastric cancer and 8 samples of normal gastric tissues. Results ①Of 80 gastric cancer specimens examined, 56 cases （70.0%） showed staining with PGP9.5 in most tumor cells, whereas no PGP9.5 expression was detected in normal epithelium, which was consistent with the results of Western blot. ②The results of immunohistochemistry revealed that there were significantly correlations between the expression of PGP9.5 and the depth of invasion, the degree of differentiation, and the occurrence of lymph node metastasis （P〈0.05）, respectively; yet, there were no relation between the expression of PGP9.5 and age, gender, histopathologic type and TNM stage （P〉0.05）. Conclusion PGP9.5 may play an important role in the invasion and metastasis of gastric cancer, and the invasion of gastric cancer could be detected by PGP9.5, which may be a useful molecular marker.