摘要目的 探讨肿瘤转移抑制基因KAI1与胰腺癌转移及预后的相关性,并进一步研究此相关性与其等位基因杂合性缺失(LOH)的关系.方法 收集胰腺癌标本62例,行免疫组织化学Power-vision二步法检测KAI1基因(CD82)的表达;石蜡切片显微切割癌及癌旁正常胰腺组织,提取DNA,变性高效液相色谱法(DHPLC)检测LOH.结果 CD82在胰腺癌原发灶中表达率为76%(47/62),在有淋巴结转移、远处脏器转移病例中表达显著降低(P<0.05),在晚期(Ⅲ、Ⅳ)肿瘤中比早期(Ⅰ、Ⅱ)表达显著降低(P<0.01),CD82表达阳性者的1年生存率显著高于表达阴性者(P<0.05).显微切割标本PCR扩增,微卫星D11S1344有5对、D11S1326有2对存在LOH,发生率为17%.结论 随着胰腺癌的进展,CD82的表达逐渐降低,这种降低与KAI1等位基因的杂合性缺失有关.检测CD82的表达及LOH对判断肿瘤的分期,淋巴转移和远处转移及患者的预后有一定的参考价值.

abstractsObjective To investigate the role of KAI1 gene expression and loss of heterozygosity (LOH) of KAI1 in metastatic potential and prognosis of pancreatic cancer. Methods The expression of KAI1 gene was studied by immunohistochemistry for CD82 on paraffin-embedded tumor tissues. The LOH of KAI1 gene was detected by microdissection, polymerase chain reaction (PCR) and denaturing high performance liquid chromatography (DHPLC). Results The pesitivity rate of CD82 in primary pancreatic cancer was 76% (47/62). CD82 expression was significantly higher (P<0.01 ) in earlier tumor stages (Ⅰ and Ⅱ), as compared to the advanced tumor stages (Ⅲ and Ⅳ) in which nodal or distant metastases were present. The expression rate of CD82 in patients who survived for more than one year was higher than that in patients who survived for less than one year ( P<0.05 ). The percentage of LOH at D11S1344 and D11S1326 loci was 17%. Conclusions The abnormal expression of CD82 which participates in malignant progression of pancreatic cancer is probably associated with LOH of KAI1 gene. Detection of CD82 expression and LOH of KAI1 gene may carry potential clinical significance in evaluating the metastatic potential and prognosis of pancreatic cancer.