非小细胞肺癌肿瘤药敏与耐药基因MDR1、MRP、GST-π表达的相关性研究

目的研究非小细胞肺癌(NSCLC)多药耐药(MDR1)、谷胱甘肽转移酶(GST-π)、多药耐药相关蛋白(MRP)基因表达和肿瘤药物敏感试验之间的相关性及临床指导意义.方法 48例NSCLC(可手术)进入研究,药敏方法采用磷脂结合蛋白V(Annexin V)联合碘化丙啶(PI)双参数法,耐药基因MDR1、GST-π、MRP采用逆转录聚合酶链反应(RT-PCR)检测.结果抗癌药物检测显示紫杉醇(商品名泰素)、顺铂、去甲长春花碱、丝裂霉素、鬼臼乙叉甙、双氟胞苷、长春碱酰胺、长春新碱的平均抑瘤率分别为(15.7±21.8)%, (20.7±22.2)%,(7.9±16.2)%,(10.3±17.1)%,(9.7±20.1)%,(11.2±13.8)%,(5.6±14.9)%,(4.7 ±8.7)%.耐药基因MDR1、MRP、GST-π阳性率分别为67%(32/48),42%(20/48),48%(23/48).耐药基因MRP、GST-π阳性及阴性表达与病理类型之间未见明显相关;而在MDR1组中鳞癌及腺癌的MDR1阳性表达明显高于阴性表达组(P<0.05).NSCLC各期别中MDR1、MRP、GST-π阳性表达统计学上未见明显差异.在所检测的所有抗癌药物与MDR1耐药基因阳性与阴性表达未见相关性.MRP表达阳性者对去甲长春花碱、长春碱酰胺、长春新碱和丝裂霉素的肿瘤抑制率显著低于阴性表达组(P<0.05).而MRP表达与顺铂、鬼臼乙叉甙、紫杉醇肿瘤药敏未见明显相关.耐药基因GST-π阳性表达者对顺铂、去甲长春花碱、丝裂霉素的抑瘤率显著低于阴性表达组(P<0.05).结论肺癌耐药基因GST-π、MRP表达与部分化疗药物肿瘤药敏存在相关性,耐药基因检测对指导临床化疗药物的选择具有一定的帮助.

The relationship between drug sensitivity and expression of drug resistance gene mutations in non-small cell lung cancer

OBJECTIVE: To study the relationship between the expression of drug resistance genes and the results of drug sensitivity test. METHODS: Surgical or biopsy specimens from 48 patients with non-small cell lung cancer (NSCLC) were measured for drug sensitivity by Annexin V combined with PI using flow cytometry. The drug resistance genes MDR(1), GST-pi and MPR were measured by RT-PCR. The relationship between expression of drug resistance gene mutations and the drug sensitivity of lung cancer was analyzed. RESULTS: The anti-tumor cytotoxicity of MMC, DDP, VDS, NVB, TAX, GEM, VP-16 and VCR were measured, and their respective tumor inhibition rates were (10.3 +/- 17.1)%, (20.7 +/- 22.2)%, (5.6 +/- 14.9)%, (7.9 +/- 16.2)%, (15.7 +/- 21.8)%, (11.2 +/- 13.8)%, (9.7 +/- 20.1)%, and (4.7 +/- 8.7)%. The positive rates of MDR(1), MRP and GST-pi expression were 67% (32/48), 42% (20/48), and 48% (23/48) respectively. There was no association between the expression of drug resistance genes MRP and GST-pi and the pathology or the stage of lung cancer. Interestingly, the over-expression of MRP was related to drug resistance to NVB, VDS and MMC; while the over-expression of GST-pi was related to resistance to DDP. No relationship was found between MDR(1) over-expression and drug resistance. CONCLUSION: The expression of some drug resistance genes is related to drug sensitivity test. The detection of the genes may be clinically useful in the administration of chemotherapy.