[中图分类号] R737.33 [文献标识码] B [文章编号] 1673-9701(2014)02-0068-04
Expression and correlation of EGFR and VEGF in cervical carcinoma
ZHOU Suying1 CHEN Guorong2 FENG Guofei1 PAN Dan1 ZHANG Pinnan1 YANG Xiaomin1 XIA Zuoli1
1.Department of Pathology, the People’s Hospital of Wenzhou City in Zhejiang Province, Wenzhou 325200, China;
2.Department of Pathology, the First Affiliated Hospital of Wenzhou Medical College, Wenzhou 325000, China
[Abstract] Objective To study the relationship between the expressions of EGFR, VEGF in cervical carcinoma and to observe the correlation between EGFR and VEGF in them. Methods The expressions of EGFR and VEGF were studied by immunohistochemical EnVision in tissue microarray containing 80 cervical carcinoma tissues and the corresponding adjacent tissues. The relationship between EGFR and VEGF expression and the chinicopathological features was analyzed. Results The positive rates of EGFR and VEGF were 94.8% and 79.1% respectively in cervical carcinoma. However they were 15% and 20% respectively in the corresponding adjacent tissues. Expressions of EGFR and VEGF proteins were significantly higher in cervical carcinoma than those in adjacent tissues (P<0.01). The overexpression of EGFR was found significantly associated with the tumer size,tissue type,differentiation degree, knubbly invasive depth,lymphnode metastasis and clinical stage(P<0.05). That of VEGF found significantly associated with the tumer size,lymphnode metastasis and clinical stage (P<0.05). Besides, the overexpression of EGFR was correlated with the overexpression of VEGF (r=0.2548, P<0.05). Conclusion The overexpression of EGFR and VEGF in cervical carcinoma are closely correlated with the growth, invasion and metastasis, prognosis, and maybe have synergistic effect in development of cervical carcinoma.
[Key words] Cervical carcinoma; Epidermal growth factor receptor(EGFR); Vascular endothelial growth factor(VEGF); Immunohistochemistry; Tissue microarray; Targeted therapy
宫颈癌是发生在全球女性中第二大常见的恶性肿瘤[1],其发病率有逐年上升且发病年轻化的趋势。表皮生长因子受体 (epidermal growth factor receptor,EGFR)是宫颈癌发生发展的重要因素,它与相应的配体结合后,形成同源二聚体或异源二聚体,使受体的酪氨酸激酶,启动一系列调节细胞各方面功能的下游信号转导通路,包括细胞增殖、凋亡、血管发生、吸附和运动性,在癌组织中,这些通路调节障碍,可致使细胞过度增殖、转移和耐药[2]。
血管内皮生长因子(vascular endothelial growth factor,VEGF)是目前发现的最重要的促血管生长因子,有促进血管内皮细胞分化、增生、迁移和浸润的作用[3],在多种肿瘤中VEGF的表达增高,并且其水平的高低与肿瘤的某些生物学行为有密切关系。本文对构建含有80例宫颈癌和癌旁组织标本的组织芯片进行免疫组化EnVision法检测EGFR、VEGF的表达,以探讨宫颈癌发生发展中EGFR、VEGF表达与宫颈癌临床病理特征的关系和相关性,寻找宫颈癌抗肿瘤治疗的靶点。
1资料与方法
1.1临床资料
随机选择温州市人民医院病理科2003~2009年间80例宫颈癌根治术石蜡包埋组织蜡块。包括鳞癌、腺鳞癌、腺癌,患者年龄 31~72岁。切4 μm切片1张,HE染色后,在蜡块上选取癌组织区域,采用手术组织芯片制备仪,制备成阵列分别为6×4,7×4,7×4,3个组织芯片蜡块。另取癌旁组织20例作为对照,宫颈癌病理分级按WHO分级标准。临床分期按FIGO的标准。
1.2方法
组织芯片上免疫组化采用EnVision二步法,DAB显色。鼠单抗EGFR检测试剂盒购自北京中山生物技术有限公司,鼠抗人VEGF单克隆抗体购自福州迈新生物技术开发公司。石蜡切片脱蜡,梯度酒精水化,4%过氧化氢阻断内源性过氧化物酶活性,按各检测物试剂盒说明书进行,苏木素复染,中性树胶封固,镜下观察结果,记录并拍照。以已知阳性片为阳性对照,用磷酸盐缓冲液(PBS)代替一抗为阴性对照。2人双盲法观察切片,选取至少5个具有代表性高倍视野(细胞数不少于1000个),对免疫组化结果进行评估。
1.3结果判断
EGFR表达物定位于细胞浆或细胞膜,以膜着色为主,呈棕黄色;VEGF主要定位于细胞浆,呈棕黄色;镜下根据显色强度和阳性细胞百分率,采用半定量积分法判断结果:基本不着色为0分,着色浅为1分,着色适中为2分,着色深为3分,每张切片阳性细胞占≤5%为0分,6%~25%为1分,26%~50%为2分,51%~75%为3分,>75%为4分;两者积分相乘,阴性≤1分,弱阳性2~4分,强阳性为≥5分。
1.4统计学处理
以SPSS统计学软件进行数据处理,EGFR和VEGF在宫颈癌与癌旁组织中阳性表达率的比较及其与临床病理特征各组间的比较采用χ2检验;变量间相关性用Pearson直线相关分析,P<0.05为差异有统计学意义。
2 结果
2.1 EGFR和VEGF在宫颈癌组织及癌旁组织中的表达
组织芯片经HE染色后发现2例组织点发生脱片、移位,1例定位有误,未见肿瘤细胞,剔除此3例病例组织学观察77例。EGFR阳性信号在宫颈癌组织中主要分布于癌巢中(见图1)。细胞浆或细胞膜着色,着淡黄色、黄色、棕黄色,同一切片中阳性细胞分布不均,染色范围及程度不同,癌旁与间质表达淡于癌巢。在鳞癌中,角化区域淡于非角化区域。鳞癌表达强于腺癌及腺鳞癌。20例癌旁组织中,3例偶见弱阳性表达,表达位于其基底细胞层及上层不典型增生细胞层;77例宫颈癌中,73例表达阳性,4例阴性,阳性率为94.8%,宫颈癌中EGFR的表达显著高于癌旁组织(校正法:χ2=54.998,P<0.01)(见图2)。 (责任编辑:南粤论文中心)转贴于南粤论文中心: http://www.nylw.net(代写代发论文_毕业论文带写_广州职称论文代发_广州论文网)