实时荧光定量PCR检测CK18对胃癌淋巴结微转移的诊断价值

[目的]建立细胞角蛋白18（CK18）实时荧光定量PCR（RTFQ-PCR）检测系统,定量检测CK18在胃癌淋巴结中的表达水平．发现淋巴结微转移,从而提高胃癌淋巴结转移诊断的阳性率。[方法]应用TaqMan探针实时荧光定量PCR方法,以CK18作为淋巴结微转移的标志基因,制备CK18表达序列的标准品,并建立标准曲线。定量检测24例病理证实无淋巴结转移的胃癌患者199枚淋巴结的CK18 mRNA拷贝数。[结果]RTFQ—PCR检测CK18 mRNA的95％CV值为2．38％,敏感性达10个拷贝。24例病理无淋巴结转移的胃癌患者,15例CK18 mRNA阳性。阳性率为62．5％（15,24）。RTFQ-PCR检测CK18 mRNA的量值水平,最小值为2．57×10^2,最大值1．08×10^8。[结论]应用RTFQ-PCR方法,以CK18作为淋巴结微转移的标志基因．可提高胃癌淋巴结转移的检出率．能够发现组织病理学检查不能发现的微转移灶,并可能对微转移分级有益。     

Tiam1与胃癌侵袭及转移相关性研究

目的 检测T淋巴瘤侵袭转移诱导因子1(Tiam1)在正常胃黏膜组织、不典型增生组织、胃癌组织及淋巴结转移灶的表达,探讨Tiam11与胃癌侵袭及转移的关系.方法 应用免疫组化方法检测42例正常胃黏膜组织、53例不典型增生组织、86例胃癌及40例淋巴结转移灶中Tiam1蛋白的表达,分析其与胃癌临床病理因素间的关系.结果 Tiam1蛋白在正常胃黏膜组织中表达(11.9%)显著低于不典型增生组织(49.1%)、癌组织(83.7%)和淋巴结转移灶(90.0%),差异有显著性(P＜0.01),且随胃癌组织浸润深度的增加及伴有淋巴结转移,Tiam1蛋白阳性率逐渐升高,差异有显著性(P＜0.05或P＜0.01).但Tiam1蛋白表达水平与胃癌患者的性别、年龄及组织类型无关(P＞0.05).结论 随着胃癌的侵袭及转移,Tiam1表达呈上升趋势,与胃癌进展转移呈正相关.Tiam1基因有可能成为肿瘤治疗的新靶点.     

巢式RT-PCR检胃癌患者外周血循环癌细胞的研究

目的　分析胃癌患者外周血中CK 2 0mRNA及CEAmRNA的异常表达及意义。方法　采用RT PCR方法检测 5 2例胃癌患者术前外周血中CK 2 0mRNA及CEAmRNA的表达。结果　胃癌患者外周血中CK 2 0mRNA、CEAmRNA阳性表达率分别为 42 .3 % (2 2 /5 2 )及 5 1.9% (2 7/5 2 ) ,CK 2 0mRNA和CEAmRNA两者中至少 1个基因为阳性的表达率为 63 .5 % (3 3 /5 2 )。胃癌患者外周血中CK 2 0mRNA表达与胃癌的远处转移有关 ,CEAmRNA表达、CK 2 0mRNA和CEAmRNA都表达、CK 2 0mR NA和CEAmRNA两者中至少 1个表达与胃癌的浸润深度、淋巴结转移和远处转移相关 (P <0 .0 5 )。结论　胃癌患者外周血CK 2 0和CEA的RT PCR检测有助于患者预后的判断 ;联合检测CK 2 0mRNA和CEAmRNA可增加外周血循环癌细胞检测的敏感性     

胃癌组织中Tiam1的表达及临床意义

目的探讨Tiam1在胃癌组织中的表达与胃癌发生、发展和转移的关系。方法应用免疫组化SP法对56例胃癌和15例正常胃黏膜组织中Tiam1蛋白进行检测。结果与正常胃黏膜组织相比,Tiam1在胃癌组织中高表达(U=4.964,P<0.01);且随着TNM分期的升高、淋巴结转移的发生、组织分化程度的降低、肿块大小的增加及浸润深度的增加,Tiam1蛋白染色阳性率逐渐升高,有统计学意义(P<0.05),但Tiam1蛋白表达水平与胃癌患者性别、年龄无关(P>0.05)。结论 Tiam1表达与胃癌的侵袭、转移密切相关。     

Tiam1基因在胃癌中的表达及意义

目的 研究Tiam1表达与胃癌浸润转移及其与病人预后的关系.方法 应用FTTC标记的免疫荧光法检测52例人胃癌及20例正常胃黏膜组织中Tiam1蛋白的表达.结果 50例胃癌和20例正常黏膜组织中Tiam1的阳性分别为75%和10%.Tiam1蛋白在胃癌组织中的表达水平与病人的年龄、性别及肿瘤的大小无关(U值分别为0.5132,0.2597,1.1708,P＞0.05);但与胃癌组织的分化程度、浸润深度、淋巴结的转移情况、肿瘤的分期以及病人的五年存活情况具有显著相关性(U值分别为3.1838,3.0430,2.2597,5.1035,4.3266,P＜0.05).随着胃癌组织分化程度的降低,浸润深度的加深,Tiam1蛋白染色阳性率逐渐上升,Tiam1阳性率增高提示预后不良.结论 Tiam1蛋白的表达与胃癌浸润转移呈相关关系,并与多种临床病理因素相关,可为胃癌浸润转移的防治和病人的预后判定提供有价值的参考.     

FAF1 mRNA在人胃癌组织中的表达及其临床意义

目的:分析FAF1mRNA的表达水平与胃癌临床指标的关系.方法:用荧光实时定量聚合酶链反应(Real time PCR)技术定量检测40例胃癌患者癌组织、癌旁组织及正常组织中FAF1mRNA的表达情况.结果:FAF1mRNA在癌组织中的表达水平(0.27±0.12)明显低于癌旁(0.40±0.06)和正常组织(0.48±0.08)(P＜0.01).FAF1mRNA在胃癌中的表达水平与癌细胞分化程度、远处转移有关,而与年龄、性别、浸润深度、临床分期、有无淋巴结转移及肿瘤大小无关.结论:FAF1可能与胃癌的发生与发展有关.FAF1异常表达在胃癌细胞分化过程中可能发挥重要作用.     

T淋巴瘤侵袭转移诱导基因1在头颈部鳞状细胞癌中的表达及意义

目的探讨T淋巴瘤侵袭转移诱导基因1(Tiam1)表达与头颈部鳞状细胞癌浸润转移的关系。方法应用逆转录-PCR(RT-PCR)技术,对91例头颈部鳞状细胞癌组织和30例头颈部正常组织进行Tiam1 mRNA表达水平的检测,并结合临床特点进行分析。结果 Tiam1 mRNA在91例头颈部鳞状细胞癌组织中的表达水平明显高于头颈部正常组织,差异有统计学意义(P<0.01)。Tiam1 mRNA在淋巴结癌、扁桃体癌及中耳癌组织中的表达水平明显高于头颈部正常组织。Tiam1mRNA在不同分期、有无淋巴结转移的鼻咽癌、喉癌及上颌窦癌中的表达差异均有统计学意义(P<0.01)。结论 Tiam1 mRNA在头颈部鳞状细胞癌浸润转移过程中可能起重要作用,可成为判断头颈部鳞状细胞癌预后的指标之一。     

MMP-2和Tiam1蛋白表达与胃癌生物学行为相关性的实验研究

目的探讨胃组织中基质金属蛋白酶-2(MMP-2)和T淋巴瘤侵袭转移诱导因子1(Tiam1)基因的表达与胃癌生物学行为的相关性。方法应用S-P免疫组化法,对40例胃癌手术切除标本进行抗人MMP-2单克隆抗体和Tiam1多克隆抗体免疫组化染色,检测癌组织、癌旁组织、手术切缘区正常组织各区域MMP-2和Tiam1蛋白表达,并分析二者之间及二者的表达与胃癌临床病理特征之间的关系。结果 MMP-2和Tiam1蛋白表达在癌组织与手术切缘区正常组织、癌组织与癌旁组织、癌旁组织与正常手术切缘区组织之间差异均具有显著性。癌组织中MMP-2和Tiam1蛋白表达在患者性别、年龄之间无显著性差异,而与肿瘤分化程度、浸润深度、淋巴结及远处转移、临床TNM分期均呈正相关;且两种蛋白表达彼此间具有相关性,即同时表达阳性的胃癌病例具有更为恶性的生物学特征。结论MMP-2和Tiam1在胃癌的发生和侵袭转移中可能起着重要作用,检测MMP-2和Tiam1的表达有望成为判断胃癌病变发展、预测肿瘤转移潜能的客观指标。     

T淋巴瘤侵袭转移诱导因子1在胃癌组织中的表达及其临床意义

目的观察胃癌和正常胃粘膜组织中T淋巴瘤侵袭转移诱导因子1(Tlymphomainvasionandmetas tasisinducingfactor1,Tiam1)蛋白的表达情况并探讨其临床意义。方法应用链酶亲和素-生物素过氧化物酶复合物免疫组化法检测60例经福尔马林固定、石蜡包埋之胃癌及正常胃粘膜组织标本中Tiam1蛋白的表达情况并分析其与胃癌临床病理参数间的关系。结果Tiam1蛋白在正常胃粘膜组织中呈阴性染色(0/60,0.00%),但在胃癌组织中则呈阳性染色(47/60,78.33%),两者间统计学差异非常显著(P<0.01);且随胃癌组织分化程度的降低、浸润深度的增加、TNM分期的升高及伴有淋巴结转移的发生,Tiam1蛋白染色阳性率逐渐升高,统计学意义显著(P<0.05)。但Tiam1蛋白表达水平与胃癌患者的性别、年龄、癌变原发部位及癌肿大小无关,统计学意义不显著(P>0.05)。结论Tiam1蛋白的表达与胃癌浸润、转移密切相关并有可能作为反映其生物学行为的一种新型标志物。     

过氧化物还原酶Ⅱ在胃癌中的表达及临床病理意义

背景与目的:过氧化物还原酶Ⅱ(peroxiredoxinⅡ,PrxⅡ)是具有过氧化物酶活性的蛋白,相关研究提示其参与多种恶性肿瘤的发生、发展.该实验通过研究人类胃癌组织及细胞中的PrxⅡ的表达情况,分析其与胃癌临床病理特征的关系,探讨其与胃癌发生、发展及预后的关系.方法:采用实时荧光定量聚合酶链反应(real-time fluorescent quantitative polymerase chain reaction,RTFQ-PCR)和蛋白[质]印迹法(Western blot)检测45例胃癌患者的癌组织及相应的癌旁组织、胃正常细胞(GES-1)及胃腺癌细胞(MGC-803、MKN-45和MKN-28)的PrxⅡmRNA及蛋白表达情况.应用免疫组织化学S-P法检测胃癌组织芯片中116例胃癌患者癌组织及癌旁组织的PrxⅡ的表达量,分析PrxⅡ表达与胃癌临床病理特征的关系并做生存分析.结果:RTFQ-PCR和Western blot检测结果显示,胃癌组织中PrxⅡmRNA及蛋白表达水平明显高于相应的癌旁组织(P<0.05).胃癌细胞中PrxⅡmRNA及蛋白表达水平明显高于胃正常细胞(P<0.01).免疫组织化学结果显示,胃癌组织中PrxⅡ蛋白的表达阳性率(76.7％)同样明显高于相应癌旁组织(30.1％,P<0.01).PrxⅡ蛋白表达与胃癌的肿瘤大小、分化程度、浸润深度、TNM分期及淋巴结转移密切相关(P<0.05),而与患者的性别、年龄、肿瘤部位及远处转移无关(P>0.05).PrxⅡ蛋白高表达者的生存时间要显著低于低表达者(P<0.01),PrxⅡ是影响胃癌预后的独立危险因素.结论:PrxⅡ促进胃癌的发生、发展,是胃癌的不良预后因素,其研究可能为胃癌的治疗提供新的靶点.     

P-glycoprotein expression in non-hodgkins-lymphoma

Tissues from twenty-nine patients with non-Hodgkin's lymphoma (NHL) were examined for the presence of the P-glycoprotein (Pgp), a transmembrane protein associated with multidrug resistance. Six of the 29 NHL (21%) expressed Pgp; 3 of 8 (38%) low grade and 3 of 16 (19%) intermediate grade. No relationship was found between Pgp expression and age, stage, lactate dehydrogenase levels, extranodal disease or previous chemotherapy exposure. Pgp was present in 3 of 13 (23%) complete responders and 3 of 11 (27%) partial or nonresponders (p>0.10) suggesting no direct association between treatment response and Pgp expression in this series.     

Survivin expression in ganglioglioma

Summary Gangliogliomas are unusual central nervous system (CNS) neoplasms occurring mainly in children and young adults and inducing chronic pharmacoresistant epilepsy. These are usually well differentiated neuroepithelial tumors composed of neurons in association with neoplastic glial cells. Gangliogliomas present with favorable outcome. However, some may recur and/or progress to anaplasia and be associated with a dismal prognosis. Since histopathological features do not consistently correlate with clinical outcome, reliable prognostic factors have yet to be defined in gangliogliomas. Survivin is an anti-apoptotic protein whose expression has been found to be of prognostic significance in many human cancers, including gliomas. The objective of this study was to assess survivin expression using immunohistochemistry in 15 gangliogliomas. Ten lesions were low-grade neoplasms whereas 5 were high-grade tumors. Survivin expression appeared restricted to the neoplastic glial component and was detected in 6/15 gangliogliomas. Two additional tumors expressed survivin upon relapse. Half survivin expressing lesions displayed less than 1% immunoreactive cells. Survivin expression in more than 5% neoplastic glial cells was detected only in malignant and/or recurrent gangliogliomas. Extended lifespan in survivin expressing cells might enhance aggressive behavior in these tumors through accumulation of mutations, thereby allowing progression to malignant phenotypes. Survivin expression may carry a negative prognostic value in gangliogliomas.     

血液肿瘤基因表达和基因表达模式研究进展

基因表达失调与血液肿瘤的生物学特性、治疗反应和预后密切相关。近年迅速发展的转录组测序、单细胞转录组测序等技术为发现疾病诊疗相关的标志性基因和研究基因表达模式提供了强有力的工具。文章结合第62届美国血液学会(ASH)年会中的报道介绍相关研究进展。     

HLA-G expression in malignant melanoma

Both, the expression of HLA-G (a non-classical HLA class I molecule) and the loss of classical HLA class I molecules enable tumor cells to evade from immunosurveillance of the host. Whereas HLA-G down-modulates the immune functions of all cells participating in the immune defence mechanisms, defects on HLA class I expression result in the resistance of tumor cells to cytotoxic T lymphocytes attacks. This contribution reviews the HLA-G expression pattern in malignant melanoma lesions, its correlation to the loss of classical HLA class I antigens, and new aspects of HLA-G regulation.     

Bcl-w expression in colorectal adenocarcinoma

We have found that the anti-apoptotic Bcl-2 family protein, Bcl-w, was frequently expressed in colorectal adenocarcinomas, with 69/75 showing positive staining with anti-Bcl-w IgG. Adenomas demonstrated a much lower frequency of Bcl-w expression (only 1 of 17), as did adenocarcinomas from other epithelial tissues such as breast (0/8), stomach (1112) and cervix (0/12). Bcl-w status could be related to the histopathological classification of the tumours, with TNM stage III tumours showing significantly higher levels of expression than tumours of better prognostic grade (at P = 0.009). Those patients with node involvement also had tumours with significantly elevated levels of Bcl-w (at P = 0.02), compared to those which were node-negative. The results suggest that Bcl-w could play a general role in the progression from adenoma to adenocarcinoma in the colorectal epithelium. Currently, more data are being collected to allow us to assess the importance of Bcl-w for disease progression and patient survival.