MRP1/CD9蛋白在人肝细胞癌中的表达及其意义

Significance of MRP1/CD9 protein expression in human hepatocellular carcinoma

目的探讨MRP1/CD9蛋白在人肝细胞癌(HCC)中的表达及其与癌侵袭转移的关系.方法构建肝癌组织芯片.样本包括肝细胞癌及癌旁肝组织152例,癌栓22例,肝内转移癌4例,肝外转移癌17例.正常对照肝组织5例.应用免疫组织化学(免疫组化)方法检测肝癌组织芯片中样本MRP1/CD9蛋白的表达.结果 27%(41/152)肝细胞癌原发灶表达MRP1/CD9蛋白.伴癌栓形成HCC中MRP1/CD9蛋白表达率低于无癌栓形成者(分别为21.82%和40.48%; P<0.05).巨块型肝癌中MRP1/CD9蛋白表达率亦低于直径在10cm以下者(分别为5%和34.82%; P<0.01).MRP1/CD9蛋白表达尚与HCC病理分级及血清AFP水平有关:病理分级2级的阳性表达率高于3～4级(分别为39.02%和22.52%;P=0.043),血清AFP≤20μg/L者阳性表达率高于>20μg/L者(分别为41.94%和22.50%;P=0.029).结论肝细胞癌MRP1/CD9蛋白表达水平低下可能与癌组织侵袭转移有关.

Objective To investigate the expression of MRP1/CD9 protein in human hepatocellular carcinoma (HCC),and its relationship to carcinoma invasion and metastasis. Methods The specimens of tissue microarray from 152 primary hepatocellular carcinomas with paracancerous liver tissue, 22 tumor emboli , 4 intrahepatic satellite metastases, 17 extrahepatic metastases ,and 5 normal livers, respectively, were constructed and used for detection of MRP1/CD9 expression by immunohistochemistry. Results Immunohistochemical analysis of tissue microarrays demonstrated MRP1/CD9 protein expression in 27.0%(41/152)of the primary HCCs. The expression of MRP1/CD9 protein was higher in HCCs without cancer thrombi than in those with cancer thrombi (40.48%vs21.82%,P<0.05). MRP1/CD9 protein expression was also inversely correlated with the tumor size (≤10cm vs >10cm, P<0.01), pathological grade (P=0.043), and the serum level of AFP (≤20μg/L vs >20μg/L, P=0.029). Conclusions Loss of MRP1/CD9 protein expression may be associated with invasion and metastases of hepatocellular carcinoma.