食管癌组织芯片p53、p16和环氧合酶-2表达的研究

目的食管癌的发生发展是多步骤、多基因变化的演化过程，本研究利用高通量的组织芯片技术，对食管癌组织及癌旁组织的p53、p16和环氧合酶（COX）-2蛋白异常表达进行分析，探讨其相关性及临床意义。方法利用组织芯片技术结合免疫组化法检测86例食管癌组织、40例癌旁组织中p53、p16、COX-2蛋白的表达。结果食管癌组织中p53、COX-2的阳性表达率均显著高于癌旁组织（P〈0．05）。食管癌组织中p16阳性表达率为5．81％，癌旁组织中没有发现p16蛋白表达，差异无统计学意义。p53与p16、p53与COX-2、p16与COX-2蛋白表达均存在差异（P〈0.05）。p53或COX-2表达阳性时组织芯片病理类型为癌性的概率增加，但p16、p53和COX-2三者不存在交互作用。结论p53、COX-2对预测和早期诊断食管癌具有重要意义。

Expression of p53, p16 and cyclooxygenase-2 in esophageal cancer detected by microarray

Objectives Esophageal cancer development and progression is driven by the accumulation of genetic changes. In this study, we used tissue microarray to survey the expression of p53, p16 and COX-2 in esophageal cancer progression and their clinical implication. Methods We tested p53, p16 and COX-2 proteins by immunohistochemistry and tissue microarray in 86 specimens from different stages of esophageal cancer and 40 specimens from adjacent non-cancer tissue. Results The expression of p53 and COX-2 was significantly higher in tumor tissue than that in non-tumor ones. As for the expression of p16, no significant difference was found between tumor and adjacent tissue. An obvious relation was observed among p53, p16 and COX-2 expression that esophageal carcinogenesis was highly correlated with the positive expression of p53 or COX-2, however, no reciprocal relationship to neoplastic progression was recognized with p53, p16 and COX-2. Conclusion We observed that the tissue with the positive expression of p53 or COX-2 was more likely to develop esophageal cancer. Further work will verify the hypothesis that the expression level of p53 and COX-2 in biopsy specimen is applicable to predict early outset of esophageal cancer.