MAGE-A9在结直肠癌中的表达及临床意义

Expression of MAGE-A9 in colorectal cancer and its clinical significance

目的观察黑色素瘤相关抗原家族(MAGE)-A9在结直肠癌组织中的表达变化,并探讨其意义。方法收集2006年1月至2008年12月南通大学附属医院初诊的203例结直肠癌患者标本,采用实时定量聚合酶链反应分析(qRT-PCR)检测结直肠癌患者癌组织及其对应癌旁正常组织中MAGE-A9mRNA的表达。通过免疫组织化学法检测203例结直肠癌与其对应癌旁组织中MAGE-A9蛋白的表达,并分析其与结直肠癌临床病理特征及患者预后的相关性。结果 MAGE-A9在结直肠癌组织中阳性率高于癌旁正常结直肠组织(P<0.05)。MAGE-A9蛋白表达与肿瘤分化程度(P=0.011)、TNM分期(P=0.003)、肿瘤浸润深度(P=0.001)和淋巴结转移(P=0.003)等临床病理特征有关。生存分析显示MAGE-A9表达与结直肠癌患者预后关系密切。结论 MAGE-A9在结直肠癌组织中表达增加,提示预后不良。

Objective To observe the expression change of melanoma-associated antigen(MAGE)-A9 in colorectal cancer(CRC)tissue and to explore its significance.Methods The samples in 23 cases of initially diagnosed CRC in the Affiliated Hospital of Nantong University from January 2006 to December 2008 were collected.The quantitative real-time(qRT)-PCR was adopted to detect MAGE-A9 mRNA expression in cancer tissue and corresponding paracancerous tissue.Its correlation with the clinicopathological features and prognosis was analyzed.Results The positive rate of MAGE-A9 in CRC tissue was significantly higher than that in paracancerous normal tissue(P<0.05).MAGE-A9 protein expression in CRC was related to the clinicopathological features such as tumor differentiation degree(P=0.011),TNM stage(P=0.003),tumor infiltration depth(P=0.001)and lymph node metastasis(P=0.003).The survival analysis showed that the expression of MAGE-A9 was closely related to the prognosis of CRC patients.Conclusion MAGE-A9 expression is increased in CRC tissue,suggesting the poor prognosis.