浸润性乳腺癌组织中P-糖蛋白以及肺耐药蛋白和多药耐药相关蛋白表达的临床意义

目的探讨浸润性乳腺癌组织中P-糖蛋白（P—gp）、肺耐药蛋白（LRP）和多药耐药相关蛋白（MRP）表达的临床意义。方法应用流式细胞术（FCM）定量分析68例原发浸润性乳腺癌患者癌组织、相应癌旁组织中上述蛋白的表达。结果浸润性乳腺癌组织P-gp、LRP和MRP表达的相对荧光强度（RFI）以中位数（M）表示分别为0．58、0．51和0．56,而相应癌旁组织分别为0．26、0．33和0．30,癌组织耐药相关蛋白表达与相应癌旁组织比较差异有统计学意义（P〈0．05）。3种耐药相关蛋白的表达与患者的年龄、肿瘤大小、病理类型、临床分期和雌、孕激素受体均无相关性（P〉0．05）。有淋巴结转移组患者P—gp和MRP的表达分别为0．61和0．69,无淋巴结转移组患者分别为0．54和0．45,两者比较差异无统计学意义（P〉0．05）。但LRP表达在有淋巴结转移组患者（M=1．49）显著高于无淋巴结转移组患者（M=0．50,P〈0．05）。相关分析显示,乳腺癌组织LRP与MRP表达间存在正相关性（P〈0．05）。结论3种耐药相关蛋白在浸润性乳腺癌组织中表达的临床意义存在差别。LRP表达与淋巴结转移状况有关且与MRP表达呈正相关,可作为预测乳腺癌预后的指标。

The clinical significance of P-glycoprotein, lung resistance protein and multidrug resistance related protein expressions in infiltrating breast carcinoma tissues

Objective Our purpose was to explore clinical significance of three kinds of drug resistance related proteins, including P-glycoprotein (P-gp), lung resistance protein (LRP), multidrug resistance related protein (MRP) expressions in infiltrating breast carcinoma tissues. Methods Flow cytometry was used to analyze the expression of drug resistance related proteins in carcinoma tissues and corresponding para-carcinoma tissues from 68 primary infiltrating breast carcinoma patients. Results The relative fluorescence intensity (RFI) expressed by median (M) of P-gp, LRP and MRP in breast carcinoma tissues were 0.58, 0.51and 0.56 respectively. In corresponding para-carcinoma tissues, their expression level were 0.26,0.33 and 0.30. Their difference were obvious (P<0.05). There were not notable differences of drug resistance related protein expressions in different ages, different tumor sizes,different pathological types, different clinical stages, estrogen receptor or progestin receptor negative and positive patients (P>0.05). The expressions of P-gp and MRP in lymph node metastasis positive patients were 0.61and 0.69, in lymph node metastasis negative patients they were 0.54 and 0.45. There were no notable differences of P-gp and MRP expression in lymph node metastasis negative and positive patients. The expression of LRP (M=1.49)was higher in lymph node metastasis positive patients than that in negative patients(M=0.50, P<0.05).The correlation analysis showed that there was positive correlation between the expression of LRP and MRP in breast carcinoma tissues(P<0.05). Conclusion The clinical significance of three kinds of drug resistance related protein expressions had differences in infiltrating breast carcinoma tissues. The expression of LRP had related with lymph node metastasis status and had positive correlation with MRP expression. It can become a target in forecasting breast carcinoma prognosis.