乙酰肝素酶在结直肠癌中的表达及意义

目的研究乙酰肝素酶（HPA1）在结直肠癌中的表达,探讨其与肿瘤生长和预后的关系。方法采用RT-PCR和免疫组织化学技术,从mRNA和蛋白水平对HPA1在结直肠癌及其周围组织中的表达进行定性和定位研究,初步分析其与结直肠癌临床病理特征和临床预后的关系。结果HPA1 mRNA在结直肠癌组织中的表达明显高于周围正常组织,HPA1 mRNA在正常肠道组织中的表达与是否患结直肠腺瘤呈正相关（r=0.352,P=0.024）;免疫组化结果发现,HPA1蛋白主要表达在结直肠癌组织、肿瘤边缘的浸润组织和血管内皮细胞;HPA1阴性患者的2年无病生存率（88.9%）高于HPA1阳性患者（50.0%）,但差异无统计学意义（P=0.078）。结论HPA1在结直肠癌组织中呈高表达,与肿瘤的发生和预后有一定的关系。

Heparanase Expression in Colorectal Cancer and Its Relationship with Clinical Prognosis

Objective Heparanase can specifically cleave carbohydrate chains of heparan sulphate proteoglycans, which is an important component of the extracellular matrix. This study was designed to investigate the expression of heparanase in patients with colorectal cancer, and to analyze its relationships with progression of the cancer and clinical prognosis. Methods Samples were collected from 36 patients with colorectal cancers from 2003 to 2004 in Peking Union Medical College Hospital, and were embeded by Paraffin and fresh-frozened. The expression of heparanase mRNA and its protein were measured by RT-PCR and immunohistochemistry. The relationships between these expressions and the clinicopathologic information (tumor invasion, tumor differentiation, lymph node involvement, accompanying with colorectal adenoma and 2-year survival) were also evaluated. Results The expressions of heparanase mRNA in colorectal cancer (19/31, 61.3%) were significantly higher than those in normal colorectal tissues (6.5%). The overexpressions in normal tissues were positively correlated to the incidence of adenoma in patients with colorectal cancer (r=0.352, P=0.024). The result of immunohistochemistry also showed that heparanase mainly expressed in the vascular endothelium within cancer tissues and the peripheral invased region outside cancer tissues. The 2-year disease-free-survival in patients with negative heparanase expression (88.9%) was higher than that with positive heparanase expression (50.0%), but there was no significant difference (P=0.078). Conclusion Heparanase overexpressed in colorectal cancer tissues, and thus it may take a role as an indicator for the formation and prognosis of colorectal cancer.