SLP-2基因在喉鳞状细胞癌和乳腺浸润性癌组织中的表达及其与预后的关系

目的 探讨两种恶性上皮性肿瘤组织--喉鳞状细胞癌(简称喉癌)和乳腺浸润性癌(简称乳腺癌)中stomatin like protein-2(SLP-2)基因在mRNA和蛋白水平的表达,及其与肿瘤的临床病理参数和预后的相关性.方法 应用逆转录聚合酶链反应(RT-PCR)检测了46对喉癌及喉正常上皮组织中SLP-2基因的表达,Western blot方法检测了其中10对标本的SLP-2蛋白表达,同时采用免疫组织化学方法分别检测了104例喉癌组织芯片和263例乳腺癌组织芯片中SLP-2蛋白的表达水平,分析SLP-2蛋白的表达与临床病理变量之间的关系.结果 RT-PCR结果显示SLP-2基因在46例喉癌中的38例肿瘤组织中的表达升高(83%,38/46),喉正常上皮组织中表达阴性.Western blot结果显示,有7例喉癌组织中SLP-2蛋白表达显著高于对应的喉正常上皮组织.喉癌组织芯片的免疫组织化学染色结果显示,与全部20例喉正常上皮组织的阴性表达(0/20)相比,SLP-2蛋白染色在104例喉癌组织中有36例出现了过表达(34.6%,36/104;P=0.000).与喉正常上皮表达相比,喉癌组织中SLP-2基因在mRNA和蛋白水平的表达均明显升高.SLP-2蛋白过表达与喉癌患者的临床分期较晚(P<0.01)和淋巴结发生转移(P=0.003)密切相关.乳腺癌组织芯片免疫组织化学染色结果显示,与在正常乳腺组织中的阴性表达(0/10)相比,SLP-2蛋白在乳腺癌组织中呈现过表达(52.5%,138/263),差异有统计学意义(P:0.000),且该蛋白的过表达与乳腺肿物的大小(P=0.020)、淋巴结转移(P<0.01)、临床分期Ⅲ期(P<0.01)以及发生远处转移(P=0.002)密切相关.此外,还与HER2/neu蛋白的表达存在显著相关性(P:0.037),生存分析表明,SLP-2蛋白过表达乳腺癌患者总生存率显著降低.多因素分析显示淋巴结状态、HER2/neu蛋白表达和SLP-2蛋白表达可能作为独立的预后因子.结论 SLP-2蛋白的过表达可能与喉癌和乳腺癌的侵袭、转移过程密切相关,并可能作为独立的预后指标提示乳腺癌患者预后不良.

Relationship between SLP-2 expression and prognosis in laryngeal squamous cell carcinoma and mammary invasive carcinoma

Objective To study the expression of stomatin like protein-2 (SLP-2) at mRNA and protein levels in two kinds of malignant epithelial tumors, including laryngeal squamous cell carcinoma (LSCC) and invasive breast cancer, and to study the relations of SLP-2 expression and clinicopathologic parameters with the prognosis. Methods RT-PCR and Western blot were used to detect the expression of SLP-2 mRNA and protein in LSCC and their normal counterparts (46 and 10 pair, respectively). Immunohistochemistry was carried on tissue array constructed from LSCC (104 cases) and breast cancer (263 cases), respectively. The association between SLP-2 expression and clinicopathologic parameters was analyzed. Results LSCC showed a higher expression of SLP-2 than that of their normal counterparts(negative expression) at mRNA (83% , 38/46) and protein (7/10) level. Immunohistochemical analysis of LSCC showed that compared with negative expression in normal laryngeal epithelium (0/20) , a higher SLP-2 expression was detected in LSCC (36/104, P = 0.000) and associated with the advanced clinical stage (P < 0. 01) and lymph node metastasis (P = 0. 003 ). Immunohistochemical study of invasive breast cancer demonstrated that compared with negative expression in normal breast tissue (0/10), more than one half of the cases showed a high SLP-2 expression (52. 5% , 138/263, P = 0. 000) in breast cancer, which correlated with the tumor size ( P = 0. 020 ) , lymph node metastasis ( P < 0. 01 ) , advanced clinical stage (P<0. 01), distant metastasis (P =0.002) and HER2/neu protein expression (P =0.037). Survival analysis showed a shorter overall survival probability in patients with a high SLP-2 expression. It was considered that lymph node metastasis, positive HER2/neu expression, and high-level SLP-2 expression may act as the independent prognostic factors for those tumors. Conclusions A high expression level of SLP-2 may be associating with the development of invasion and metastasis in LSCC and breast cancer, and SLP-2 is also considered working as an independent factor indicating a poor prognosis clinically in breast cancer.