PDCD4和凋亡抑制因子Livin在TNBC组织中的表达及与预后的相关性研究

摘要

目的 观察和分析程序性细胞死亡基因4 (PDCD4)和凋亡抑制因子Livin在三阴性乳腺癌(TN-BC)组织中的表达及与预后的相关性.方法 选取100例TNBC肿瘤组织,50例癌旁组织,50例正常乳腺组织作为研究资料,应用免疫组织化学法对3种组织中的PDCD4、Livin蛋白的表达阳性率进行检测和比较,对纳入患者进行随访,对其总生存期(OS)和无病生存期(DFS)进行观察和比较.结果 TNBC组织中PDCD4表达阳性率显著低于癌旁组织或正常乳腺组织,比较差异均有统计学意义(x2 =26.613、32.000,P＜0.05),其表达情况与肿瘤直径、淋巴结转移数量、临床分期、腋下淋巴结转移、脉管癌栓等临床病理特征有关(x2=26.936、13.210、22.774、27.463、5.803,P＜0.05);Livin蛋白表达阳性率显著高于癌旁组织或正常乳腺组织,癌旁组织中的Livin蛋白表达阳性率显著高于正常乳腺组织,差异均有统计学意义(x2=14.614、57.353、19.048,P＜0.05),其表达情况与淋巴结转移数量、临床分期、腋下淋巴结转移、脉管癌栓等临床病理特征有关(x2=10.788、6.160、27.350、8.914,P＜0.05);PDCD4表达阴性患者的OS、DFS显著低于PDCD4表达阳性患者,Livin蛋白表达阳性患者的OS、DFS显著低于Livin表达阴性患者,比较差异均有统计学意义(x2=23.931、19.163、22.649、17.213,P＜0.05),TNBC患者的OS与年龄(RR=1.405)、临床分期(RR=2.897)、肿瘤直径(RR=2.722)、腋下淋巴结转移(RR=2.516)、脉管癌栓(RR=3.020)、PDCD4表达(RR=1.752)、Livin表达(RR=2.051)等因素均具有相关性(P＜0.05),患者的DFS与临床分期(RR=2.756)、腋下淋巴结转移(RR=2.437)、PDCD4表达(RR=1.649)、Livin表达(RR=1.804)等因素均具有相关性(P＜0.05).结论 TNBC组织中存在PDCD4的低表达和Livin蛋白的过表达,而且其异常表达情况与肿瘤的临床病理特征和患者的预后具有相关性,可作为评价TNBC病情进展和预后的辅助指标.%Objective To observe and analyze the expression of programmed cell death 4 (PDCD4) gene and apoptosis inhibitor Livin in triple negative breast cancer (TNBC) tissues and its relationship with prognosis.Methods One hundred cases of TNBC tumor tissue,50 cases of adjacent carcinoma tissue,50 cases of normal breast tissue were selected as the research data.The immunohistochemical technique was applied to detect and compare the expression positive rates of PDCD4 and Livin protein in three kinds of tissues.The patients were followed up.The overall survival (OS) and the progression free survival (PFS) were observed and compared.Results The expression positive rate of PDCD4 in TNBC tissue was significantly lower than that in adjacent carcinoma tissue or normal breast tissue,the differences were statistically significant (x2=26.613,32.000,P＜0.05).The expression was correlated with the clinical pathological features of tumor size,lymph node metastasis,clinical stage,axillary lymph node metastasis and cancer embolus (x2=26.936,13.210,22.774,27.463,5.803,P＜0.05);the expression positive rate of Livin protein in TNBC tissue was significantly higher than that in adjacent carcinoma tissue or normal breast tissue and the expression positive rate of Livin protein in adjacent carcinoma tissue was significantly higher than that in normal breast tissue,the differences were statistically significant (x2 =14.614,57.353,19.048,P＜0.05).The expression was correlated with the clinical pathological features of lymph node metastasis,clinical stage,axillary lymph node metastasis and cancer embolus (x2 =10.788,6.160,27.350,8.914,P＜0.05);OS,PFS in the patients with PDCD4 negative expression were significantly lower than those in the patients with PDCD4positive expression.OS,PFS in the patients with Livin positive expression were significantly lower than those in the patients with Livin negative expression,the above differences were statistically significant (x2 =23.931,19.163,22.649,17.213,P＜0.05).OS in the TNBC patients was correlated with age (RR=1.405),clinical stage (RR =2.897),tumor diameter (RR=2.722),axillary lymph node metastasis (RR=2.516),vascular invasion (RR=3.020),PDCD4 Expression (RR=1.752) and Livin expression (RR=2.051) (P＜0.05).PFS in the patients was correlated with clinical stage (RR =2.756),axillary lymph node metastasis (RR =2.437),PDCD4 expression (RR =1.649) and Livin expression (RR=1.804) (P＜0.05).Conclusion The PDCD4 low expression and Livin protein over-expression exist in TNBC tissues.Their abnormal expressions are correlated with the clinicopathological features of tumor and the prognosis of patient,and could be used as the auxiliary indexes in evaluation of progression and prognosis of TNBC.