中文摘要：

目的 检测组织蛋白酶D（Cathepsin D,CTSD）、热休克蛋白90α（heat shock protein 90α,HSP90α）、表皮生长因子受体（epidemal growth factor receptor,EGFR）蛋白及其mRNA在胃癌组织中的表达及其与胃癌临床病理特征的关系,初步探讨CTSD、HSP90α、EGFR在胃癌发生、发展及浸润转移过程中的作用。方法 采用免疫组化及原位杂交（in situ hybridization,ISH）法检测110例正常胃黏膜组织、83例癌旁异型增生组织、110例胃癌组织及78例胃癌淋巴结转移组织中CTSD、HSP90α、EGFR蛋白及其mRNA的表达。结果 （1）CTSD、HSP90α、EGFR蛋白在110例正常胃黏膜组织、83例癌旁异型增生组织、110例胃癌组织及78例胃癌淋巴结转移组织中的阳性率分别为0、18.07%、80.91%、92.31%;0.9%、15.66%、75.45%、89.74%;0、12.05%、69.09%、84.62%。（2）相关分析结果显示,CTSD、HSP90α、EGFR在胃癌组织中的表达呈两两正相关（rs=0.853,P〈0.05;rs=0.639,P〈0.05;rs=0.734,P〈0.05）。（3）CTSD、HSP90α、EGFR在胃癌中的表达均与胃癌分化程度、浸润深度、淋巴结转移及TNM分期相关（P〈0.05）;与患者年龄、性别、肿瘤大小无显著相关性（P〉0.05）。结论 CTSD、HSP90α与EGFR可能与胃癌发生、发展以及侵袭转移等恶性生物学行为密切相关。

英文摘要：

Purpose To detect the expression of Cathepsin D（CTSD） , heat shock protein 90α （HSP90α） and epidermal growth factor receptor （EGFR） in gastric cancer （ GC ） tissues and to analyze the association of their expression levels and clinical pathological features of GC, the role of CTSD, HSP90α, EGFR in the carcinogenesis, progression, invasion and metastasis of GC. Methods The expression of CTSD, HSP90α and EGFR in normal gastric mucosa, dysplasia adjacent to carcinoma, GC tissues and lymph node metastasis was measured by immunohistochemistry （IHC） and in situ hybridization （ISH）. Results In 110 cases of normal gastric mucosa, 83 cases of dysplasia adjacent to carcinoma, 110 cases of GC and 78 cases of the lymph node metastasis, the positive rate of CTSD, HSP90α, EGFR protein was 0, 18.7%, 80.91% and 92. 31%, 0.9%, 15.66%, 75.45% and 89. 74%, 0, 12. 05% , 69.09% and 84. 62% , respectively. Correlation analysis showed that the expression CTSD, HSP90α and EGFR in GC tissues was positively correlated （ rs = 0. 853, P 〈 0. 05, rs =0.639, P〈0.05, rs =0.734, P 〈0.05）. Expression of CTSD, HSP90α and EGFR in GC was correlated with the degree of tumor differentiation, invasive depth, number of lymph node metastasis and TNM stages （ P 〈 0. 05 ）. There was no significant correlation with the patient＇s age, sex, tumor size （P 〉 0. 05）. Conclusion CTSD, HSP90α and EGFR may be associated with malignant behavior, development and invasion and metastasis of GC.