非小细胞肺癌患者肿瘤组织乳腺癌易感基因1和β微管蛋白Ⅲ表达及其与化疗疗效的关系

目的 观察肿瘤组织乳腺癌易感基因1(BRCA1)、β微管蛋白Ⅲ表达与ⅢB和(或)Ⅳ期非小细胞肺癌(NSCLC)采用紫杉醇联合顺铂(TP)方案化疗疗效的相关性.方法 入选初治、NSCLC临床TNM分期为ⅢB和(或)Ⅳ期、体能状态(PS)评分0～2分、预计生存期≥3个月的患者入选本研究.入选者均进行TP方案化疗,每3周重复,每2个周期评价1次疗效,共4～6个周期,无效者更换二线化疗方案.免疫组化检测肿瘤组织中BRCA1、β微管蛋白Ⅲ表达.根据BRCA1、β微管蛋白Ⅲ表达高低分为A组(BRCA1、β微管蛋白Ⅲ低表达)、B组(BRCA1、β微管蛋白Ⅲ高表达)、C组(BRCA1高表达,β微管蛋白Ⅲ低表达),D组(BRCA1低表达,B微管蛋白Ⅲ高表达).评价疗效指标:客观反应率(RR)、总生存时间(OS)、至肿瘤进展时间(TTP).结果 (1)人组87例ⅢB/Ⅳ期NSCLC患者,BRCA1、β微管蛋白Ⅲ表达阳性率分别为57.5%(50/87)、48.3%(42/87),BRCA1、β微管蛋白Ⅲ不同表达的NSCLC患者间临床特征比较差异无统计学意义.(2)87例患者中A组28例,B组23例,C组19例,D组17例.化疗前4组患者间的临床特征比较差异无统计学意义.4组患者RR分别为60.7%、34.8%、9/19、6/17;OS分别为(539.4±17.6)d、(267.2±20.5)d、(325.6±24.1)d、(283.7±26.2)d;TTP分别为(256.9±28.4)d、(143.8±17.6)d、(179.3±19.8)d、(152.6±23.5)d.方差分析显示,A组的RR、OS、TTP均优于其他3组,差异有统计学意义(P值分别为0.039、0.000和0.000).结论 BRCA1、β微管蛋白Ⅲ可作为TP方案疗效的预测分子;仅BRCA1、β微管蛋白Ⅲ低表达的NSCLC患者,可能是TP化疗方案的优势人群.

Abstract：

Objective To investigate the predictive value of breast cancer susceptibility gene 1 (BRCA1) and class Ⅲβ-tubulin protein expression in tumor tissue for the efficacy of taxol and cisplatin combined chemotherapy (TP) in stage Ⅲβ/Ⅳ non-small cell lung cancer(NSCLC) patients. Methods A total of 92 stage Ⅲβ/Ⅳ NSCLC patients were recruited with 87 patients evaluated. Bronchoscopy or lung puncture tumor biopsy samples were obtained with BRCA1 and class Ⅲβ-tubulin protein expression examined immunohistochemically before chemotherapy. The patients were randomly assigned to be received 4 to 6 cycles of TP chemotherapy regiments and followed up until death or lost. Response rate (RR) , overall survival (OS) and time to tumor progression (TTP) were assessed. Results Among the 87 evaluated patients, the positive expression rates of BRCA1 and class Ⅲβ-tubulin were 57. 5% (50/87) and 48. 3%(42/87) respectively. There was no significant difference in clinical characteristics among patients with different positive expression rate. According to different expression of BRCA1 and class Ⅲβ-tubulin, the patients were divided into four groups: group A (low expression of both BRCA1 and class 1 p-tubulin) ,group B (high expression of both BRCA1 and class Ⅲβ-tubulin) , group C (high expression of only BRCA1) and group D (high expression of only class Ⅲβ-tubulin). The RR was higher in group A than other three groups (60. 7% , 34. 8% , 9/19 and 6/17 respectively). The OS and TTP were longer in group A than other three groups [OS: (539. 4 ± 17. 6) days, (267. 2 ± 20. 5) days, (325. 6 ± 24. 1) days and (283.7±26.2) days respectively ; TTP: (256. 9 ± 28. 4) days, (143.8±17.6) days, (179. 3 ± 19. 8)days and (152. 6 ±23. 5) days respectively]. There were no significant differences among the other three groups. Conclusions The expression level of BRCA1 and class Ⅲβ-tubulin in tumor tissue is probably a predictor for the efficacy of TP chemotherapy in NSCLC patients. TP chemotherapy is more suitable for the NSCLC patients with lower expression of both BRCA1 and class Ⅲβ-tubulin. Our study may provide a new sight for tailored chemotherapy in NSCLC patients.