EGFR、Ras及CEA蛋白在食管癌、胃癌和大肠癌表达的研究
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摘要
背景与目的:消化道肿瘤是我国常见的恶性肿瘤之一,其中又以食管癌、胃癌和大肠癌最为常见。在肿瘤的发生机制上,一方面此三者同作为消化道的肿瘤,同受到来自饮食、生活习惯、环境因素及遗传易感性等各种致癌因素的作用,在肿瘤的发生过程中具有相似的机制;另一方面此三者又处于消化道不同的部位,其解剖学结构和生理功能均又有所不同,这决定了致癌因素的种类和性质不完全相同,作用方式及影响程度亦各有差别和侧重,在肿瘤的发生机制上又具有差异性的环节。这种生理功能、部位、阶段及刺激因素上的相似性与差异性,决定了多种基因各有侧重地参与了食管癌、胃癌、大肠癌的发生过程。近年来表皮生长因子受体(epidermal growth factor receptor,EGFR)、原癌基因ras (Proto-oncogene ras, Ras)与癌胚抗原(carcinoembryonic antigen, CEA)蛋白在消化道肿瘤发生发展中的作用受到广泛关注,针对EGFR、Ras蛋白的药物靶向治疗也取得了一定的进展。本研究采用免疫组化方法,通过检测食管癌、胃癌和大肠癌组织中EGFR、Ras及CEA蛋白的表达情况,结合它们与临床病理特征的关系,旨从蛋白水平探讨三种蛋白在消化道不同部位肿瘤发生中的作用侧重,以及它们与肿瘤发生、进展、分化的关系,以期找到指示消化道肿瘤临床病理特征的可靠分子指标。并通过分析比较EGFR、Ras和CEA蛋白在不同部位肿瘤组织中表达的差异,为靶向药物治疗肿瘤寻找较为敏感的靶点。
     方法:收集经手术切除且病理证实的食管癌21例、胃癌81例及大肠癌124例,获得完整临床及随访资料,所有标本取得前患者均未接受化学药物或放射线治疗。应用免疫组化方法检测EGFR、Ras及CEA蛋白在食管癌、胃癌及大肠癌组织中的表达情况,分析这三种蛋白表达与临床病理间的关系,所得结果在SPSS 11.5软件中进行统计学分析。
     结果:1.EGFR蛋白在胃癌组表达率明显高于大肠癌组,统计学分析有显著性差异(P<0.05); Ras蛋白在食管癌和胃癌组表达率明显高于大肠癌组,统计学分析有显著性差异(P<0.05); CEA蛋白在食管癌组表达率明显低于大肠癌组,统计学分析有显著性差异(P<0.05)。
     2.EGFR、Ras与CEA蛋白表达与临床病理特征之间的关系
     (1)食管癌组EGFR、Ras与CEA蛋白表达与患者性别、年龄、肿瘤部位、分化程度、浸润深度及有无淋巴结转移组间均无显著性差异(P>0.05)。
     (2)胃癌组中,EGFR蛋白在低分化组表达率明显高于高中分化组,统计学分析有显著性差异(P<0.05); Ras蛋白在浸润深度超出浆膜层组表达率明显高于未超出浆膜外组,统计学分析有显著性差异(P<0.05); CEA蛋白在有远处转移组明显高于无远处转移组,统计学分析有显著性差异(P<0.05)。余与性别、年龄、分化程度、浸润深度、有无淋巴结转移及有无远处转移组间均无显著性差异(P>0.05)。
     (3)大肠癌组中,EGFR蛋白在浸润深度未超出浆膜层组表达率明显高于超出浆膜外组,有显著性差异(P<0.05); Ras蛋白在浸润深度未超出浆膜层组表达率明显高于超出浆膜外组,有显著性差异(P<0.05);余与患者性别、年龄、部位、分化程度、浸润深度及有无淋巴结转移组间均无显著性差异(P>0.05)。
     3.EGFR、Ras与CEA蛋白表达的相关性
     (1)食管癌EGFR与CEA蛋白的表达呈正相关(r=0.552, P<0.05); EGFR与Ras蛋白、CEA与Ras蛋白的表达均无明显相关性(P>0.05)。
     (2)胃癌EGFR与CEA蛋白的表达呈正相关(r=0.457, P<0.05), Ras与CEA蛋白的表达呈正相关(r=0.220, P<0.05);EGFR与Ras蛋白的表达无明显相关性(P>0.05)。
     (3)大肠癌EGFR与Ras蛋白的表达呈正相关(r=0.452, P<0.05);EGFR与CEA蛋白,Ras与CEA蛋白的表达均无明显相关性(P>0.05)。
     结论:1. EGFR、Ras与CEA蛋白在食管癌、胃癌与大肠癌中均有不同程度的表达,提示此三种蛋白在消化道肿瘤的发生发展中都起了一定的作用。
     2. EGFR蛋白在骨癌、Ras蛋白在食管癌、CEA蛋白在大肠癌中表达最高,提示EGFR蛋白与胃癌、Ras蛋白与食管癌、CEA蛋白与大肠癌关系似乎更为密切,采用药物靶向治疗肿瘤,可以选择与此肿瘤关系较密切的蛋白作为药物靶点,以期获得较为理想的治疗效果。
     3.胃癌组织中EGFR蛋白的表达与肿瘤分化程度可能成负相关,Ras蛋白的表达与肿瘤浸润深度可能成正相关,CEA蛋白的表达与肿瘤远处转移可能呈正相关。
     4.食管癌及胃癌组织中EGFR与CEA蛋白表达成正相关,胃癌组织中Ras与CEA蛋白表达成正相关,大肠癌组织中EGFR与Ras蛋白表达成正相关,提示此三种蛋白在消化道肿瘤的发生发展过程中可能起了协同作用。
Background and Objective:Digestive carcinoma, especially esopha-geal cancer, gastric cancer and colorectal cancer, is most common in our country. Many factors and genes are related to their carcinogenesis. As carcinomas in alimentary canal, esophageal cancer, gastric cancer and colorectal cancer are all influenced by similar factors such as diet, habits and customs, environment and hereditary predisposition. On the other hand, these three carcinomas lie in different locations in alimentary canal, with different anatomical structure and different physiological function.This fact determins that these risk factors have distinctions in kind and character. In recent years, EGFR(epidermal growth factor receptor), Ras (Proto-oncogene ras) and CEA(carcinoembryonic antigen) protein were paid much attention to carcinomas genesis. Targeted therapy aimed at EGFR and Ras protein has been researched in recent years. By analyzing the expression of EGFR, Ras and CEA protein in esophageal cancer, gastric cancer and colorectal cancer, and their relationship with clinicopathological parameters, this project investigated the different roles of these three proteins in gastrointestinal cancer. By analyzing the different expression of EGFR, Ras and CEA protein in esophageal cancer, gastric cancer and colorectal cancer, this project intend to find targets for targeted therapy.
     Methods:Surgically resected and pathologically proved cases of esophageal cancer, gastric cancer and colorectal cancer were collected. Information related to patiens'gender, age, tumor location, histological type and pathological stage were recorded. Complete clinical information were obtained in this study. None of these patients received either radiocherapy or chemocherapy before the surgery. The specimen cases were immunostainde to observe the expression of EGFR, Ras and CEA in esophageal cancer, gastric cancer cells and colorectal cancer cells. All the results were statistically analyzed with SPSS 11.5 software package.
     Results:1.The positive expression rate of EGFR in gastric cancer group was obviously higher than colorectal cancer group(P<0.05). The positive rate of Ras expression in esophageal cancer group and gastric cancer group was obviously higher than colorectal cancer group(P<0.05). The positive rates of CEA expression in esophageal cancer group were obviously lower than colorectal cancer group(P<0.05).
     2.The relationship between EGFR, Ras and CEA protein expression and clinical characteristics.
     (1) In esophageal cancer group, the positive expression rate of EGFR, Ras and CEA have no obvious relationship with patiens'gender, age, tumour location, differention degree, depth of invasion and lymph node metastasis (P>0.05).
     (2)In gastric cancer, the positive rate of EGFR protein expression in poor differentiation group was higher than well-moderate differentiation group(P<0.05); the positive expression rates of Ras in penetrated subserous layer group was higher than infiltrated to subserous layer group(P<0.05); the positive expression rate of CEA in distant metastasis group was higher than without distant metastasis group(P<0.05).
     (3)In colorectal cancer, the positive rate of EGFR protein expression in infiltrated to subserous layer group was higher than penetrated subserous layer group(P<0.05); the positive rate of Ras protein expression in infiltrated to subserous layer group was higher than penetrated subserous layer group(P<0.05).
     3.The correlation between EGFR, Ras and CEA protein expression.
     (1)In esophageal cancer, EGFR protein expression was positively correlated with CEA protein expression(r=0.552, P<0.05). There was no significant correlation between EGFR and Ras expression(P>0.05), and the same as CEA and Ras expression.
     (2)In gastric cancer, EGFR protein expression was positively corre- lated with CEA protein expression(r=0.457, P<0.05); Ras protein expres-sion is positively correlated with CEA protein expression(r=0.220, P<0.05). There was no significant correlation between EGFR and Ras expression (P>0.05).
     (3)In colorectal cancer, EGFR protein expression was positively correlation with Ras protein expression(r=0.452, P<0.05). There was no significant correlation between EGFR and Ras expression(P>0.05), and the same as CEA and Ras expression.
     Conclusions:1.The EGFR, Ras and CEA protein all have expression more or less in esophageal cancer, gastric cancer and colorectal cancer group. These three protein may play a part in carcinogenesis.
     2.EGFR protein expression in gastric cancer, Ras protein expression in esophageal cancer and CEA protein expression in colorectal cancer were much higher than the other. The protein may be choosed as target for targeted therapy.
     3.In gastric cancer the expression of EGFR protein has negative correlation to cell differentiation, the expression of Ras protein has positive correlation to depth of invasion, and the expression of CEA protein has positive correlation to distant metastasis.
     4.EGFR and CEA protein expression has a close relationship in esophageal cancer and gastric cancer. Ras and CEA protein expression has a close relationship in gastric cancer. EGFR and Ras protein expression has a close relationship in colorectal cancer. These three protein may cooperate with each other in carcinogenesis.
引文
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