检测KAI1/CD82蛋白在结肠腺癌中表达的临床意义

The clinical significance of KAI1 /CD82 expression in colon tumor

目的 KAI1是一种特异性抑制肿瘤转移的基因 ,其蛋白产物为KAI1/CD82。通过检测 6 4例结肠腺癌石蜡切片的KAI1/CD82蛋白表达 ,探讨其与预后等临床因素的相关性。方法 肿瘤经福尔马林固定 ,石蜡包埋。免疫组化方法检测石蜡切片中KAI1/CD82蛋白表达水平。生物学统计采用 χ2 检验法。生存曲线采用Kaplan Meier软件绘制。结果 KAI1/CD82蛋白呈现棕褐色、细颗粒状物 ,弥漫性分布结肠腺癌细胞膜上。KAI1/CD82蛋白在结肠腺癌组织中表达阳性率为 5 1.5 6 %。生物学统计结果表明 ,KAI1/CD82蛋白表达与淋巴结转移、远处转移及肿瘤临床分期等密切相关 ,有统计学意义 ;而与肿瘤患者的年龄和性别、肿瘤大小、分化程度及肿瘤部位等无关。KAI1/CD82蛋白阳性结肠腺癌患者的术后生存期明显高于阴性患者 ,前者平均术后生存期为 5 4 .2 7± 2 1.5 1月 ,而后者仅为 37.5 5± 15 .17月 ,具有统计学意义。结论 KAI1/CD82表达水平与结肠腺癌分期、淋巴结转移及远处转移关系密切 ,可能和其它指标一起作为判断结肠腺癌预后的指标之一 ,对术后进一步治疗具有一定的指导意义。

Objective KAI1 gene is a specific metastasis suppressor gene, and its protein product is KAI1 /CD82. The relationship between KAI1 /CD82 expression and colon cancer patient prognosis was investigated. Methods 64 colon tumor specimens were detected and analyzed for their KAI1 /CD82 protein expression level with immunohistochemical method, the paraffin embedded tissue sections were incubated with anti KAI1 antibody. The Student's t test and the Kaplan Meier method were used. Results The KAI1 /CD82 protein was located in the membrane of colon tumor cells with a positive rate of 51.56%. The statistical evaluation showed that the expression of KAI1 /CD82 protein had a close relation with lymph node metastasis and distant metastasis as well as clinical stages, but was not related with age, gender, tumor size, differentiation and tumor location in vivo. Surviving time for the patients after being operated was dramatically higher with positive expression of KAI1 /CD82(54.27±21.51months) than those with negative one(37.55± 15.17 months). Conclusion KAI1 /CD82 expression is closely correlated with the colon tumor stages, lymph node metastasis and distant metastasis, which,together with other indexes, may be used as an index for prognosis of colon tumor, and will be significant for instructing further treatment.