PIWI蛋白在人类结肠癌组织中的表达及临床意义

The expression of PIWI protein in tissue of human colon cancer and its clinical significance

目的 分析PIWIL1、PIWIL3和PIWIL4三种蛋白在结肠癌组织和癌旁组织中的表达与临床意义.方法 选用106例结肠癌患者的癌组织和癌旁组织标本,分别制成62点和150点2份组织芯片,采用免疫组织化学方法检测结肠组织芯片中PIWIL1、PIWIL3和PIWIL4的表达.采用SPSS 17.0统计学软件,不同组织间PIWI蛋白表达差异采用配对t检验或配对Wilcoxon检验,相关性采用Pearson或Spearman等级相关分析.结果 PIWIL1、PIWIL3、PIWIL4在结肠癌组织中的表达均显著高于癌旁组织（P＜0.01）.PIWIL1、PIWIL3、PIWIL4在结肠癌和癌旁组织中的表达均呈现两两显著正相关（均P＜0.01）.癌组织PIWIL1在低分化组的表达显著高于高分化组（t=-2.840,P＜0.01）.癌组织PIWIL3表达随着临床分期的升级呈现显著升高（F=3.112,P＜0.05）.癌组织PIWIL3和PIWIL4在有远处转移组的表达显著高于无远处转移组（t=-3.349,P＜0.01;t=-2.168,P＜0.05）.癌组织PIWIL3和PIWIL4的表达均与结肠癌的发生显著相关（P值均＜0.01）.结论 PIWIL1、PIWIL3、PIWIL4在结肠癌组织中的表达与结肠癌的分化、临床分期、有无远处转移等临床指标显著相关,且PIWIL3和PIWIL4的表达是结肠癌发生的独立相关因素,有望进一步研究探讨其是否能作为结肠癌早期诊断的分子标志物及分子治疗靶点.

Objective To study the expression of PIWIL1, PIWIL3 and PIWIL4 in human colon cancer and its clinical significance. Methods We collected cancerous tissues and its adjacent tissues of 106 patients with colon cancer, two tissue microarrays were constructed, with 62 and 150 points respectively. We studied the expression of PIWIL1, PIWIL3 and PIWIL4 through immunohistochemistry. Results The expression of PIWIL1, PIWIL3 and PIWIL4 were significantly higher in cancerous tissues than those in adjacent tissues （P＜0. 01）. In cancerous tissues and its adjacent tissues, postive correlation were seen among PIWIL1, PIWIL3 and PIWIL4 expression （P＜0. 01）. PIWIL1 expression was significant higher in low differentiation group than that in high differentiation group （t =- 2. 840, P＜0.01 ）. PIWIL3 expression was higher in high clinical stage than that in low clinical stage （F= 3. 112, P＜0.05）. The expression of PIWIL3 and PIWIL4 were significantly higher in patients with colon cancer with distant metastasis than those without distant metastasis （t= -3. 349, P＜0.01 ; t = - 2. 168, P＜0. 05）. PIWIL3 and PIWIL4 expression were correlated with occurring of colon cancer （P＜0. 01）. Conclusions The expressions of PIWIL1,PIWIL3 and PIWIL4 in colon cancer were correlated with the differentiation, clinical stage and distant metastasis of colon cancer. PIWIL3 and PIWIL4 expression were two independent related factors of occurring of colon cancer, which would be furtherly investigated to be served as novel markers for early diagnosis and promising molecular targets for colon cancer therapy.