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胃癌患者MMP-3血清水平及癌组织中VEGF-C、MMP-3的表达
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摘要
目的:通过检测胃癌患者血清基质金属蛋白酶-3(Matrix metalloproteinases 3,MMP-3)的水平,及其癌组织中血管内皮生长因子-C(Vascular endothelial growth factor C,VEGF-C)、MMP-3的表达,研究它们在胃癌发生发展过程的作用。
     方法:选取胃癌患者50例,男34例,女16例,病例为2008年10月至2009年4月在齐鲁医院普外科住院手术的患者,手术后病理证实为胃癌,收集癌组织,同时取距离癌组织边缘5cm以上的胃黏膜作为正常对照,所有标本均行HE染色做病理学检查,且术前未经任何针对胃癌的治疗。上述胃癌患者及对照组(同期健康人30人,均为正常体检者,均无近期手术、创伤及肿瘤等病史)禁饮食10小时后,前者于入院后第2天早上及术后第7天早上采集空腹外周静脉血5m1,后者于清晨采集空腹外周静脉血5ml。所采血液标本凝血后分离血清液,迅速储存于-80℃冰箱冷藏备用。运用ELISA方法检测胃癌患者术前与术后血清中MMP-3的水平变化及正常健康人血清中MMP-3的水平,检测过程严格按照试剂说明书进行。同时应用免疫组织化学方法检测胃癌患者手术标本(癌组织、距癌边缘>5cm胃粘膜)中VEGF-C、MMP-3的表达。
     结果:胃癌患者术前血清MMP-3水平明显高于正常对照者(30.96±9.75ng/ml vs 14.43±4.82ng/ml,P<0.05);胃癌患者术前血清MMP-3水平明显高于术后1周血清MMP-3水平(30.96±9.75ng/ml vs 16.29±5.92ng/ml,P<0.05);而术后1周血清MMP-3水平与正常对照者无显著性差异(P>0.05)。浸润达到或超过浆膜层的患者术前血清MMP-3水平明显高于未达浆膜层者(32.60±10.05ng/ml vs24.43±4.56ng/ml,P<0.05);有淋巴结转移者,术前血清MMP-3水平明显高于无淋巴结转移者(32.11±9.79ng/ml vs 22.55±3.41ng/ml,P<0.05);Ⅲ/Ⅳ期胃癌术前血清MMP-3水平明显高于分期为I/II期者(34.26±9.30ng/ml vs 25.10±7.71ng/ml,P<0.05);而术前血清MMP-3水平与胃癌患者性别、年龄、肿瘤大小、部位、分化程度无明显相关性(P>0.05)。在胃癌组织中,MMP-3主要定位于胃癌细胞细胞浆内和(或)细胞膜上,阳性率为68%(34/50例),癌旁组织中可见弱阳性染色,阳性率为20%(10/50例),绝大部分为阴性表达,胃癌组织中MMP-3的表达明显高于癌旁组织中MMP-3表达(P<0.05);胃癌组织中MMP-3的表达与胃癌患者淋巴结转移及TNM分期有关(P<0.05),而与患者性别、年龄、肿瘤大小、部位、分化程度,浸润深度无明显相关性(P>0.05)。胃癌组织MMP-3表达为++/+++的患者术前血清MMP-3水平明显高于MMP-3表达为-/+者(P<0.05)。在胃癌组织中,VEGF-C主要定位于胃癌细胞细胞浆内,阳性率为50%(25/50例),癌旁组织中均为阴性表达,胃癌组织中VEGF-C的表达与胃癌患者浸润深度及淋巴结转移有关(P<0.05),而与患者性别、年龄、肿瘤大小、部位、分化程度,TNM分期无明显相关性(P>0.05)。胃癌组织中MMP-3与VEGF-C的表达成正相关(rs=0.360,P<0.05)。
     结论:VEGF-C、MMP-3在胃癌侵袭转移中起到了重要作用;联合检测VEGF-C与MMP-3的表达,特别是检测术前术后血清中MMP-3水平对胃癌早期预测及判断胃癌预后具有一定的临床意义。
Objective:To investigate the serum level of MMP-3 and the expressions of VEGF-C and MMP-3 in gastric cancer to study their role in the process of gastric cancer.
     Methods:First,we selected 50 cases of gastric cancer patients,34 cases of males,16 cases of females, that were operated in the department of general surgery in Qilu Hospital from October 2008 to April 2009.A11 Specimens were confirmed by pathology. And we collected tumor tissues and the gastric mucosa from 5 centimeters above the edge of carcinoma.All specimens underwent pathological examination by HE staining. None of them was done any pre-operative treatment for gastric cancer. And we selected 30 healthy people over the same period as the control group. Five milliliters of peripheral venous blood was collected in the morning after fasting. Clotting of blood samples were taken after the separation of serum fluid and rapidly stored in-80℃refrigerator spare. ELISA used to detect the preoperative, the postoperative and the normal group's serum levels of MMP-3.The immunohistochemical method was used to analyze the expression of VEGF-C and MMP-3 in 50 resected specimens.(tumor tissues and the normal control group).
     Results:The preoperative serum level of MMP-3(30.96±9.75ng/ml) was significantly higher than that of postoperative group(16.29±5.92ng/ml)and control group (14.43±4.82ng/ml)(P<0.05).The postoperative serum level of MMP-3 after one week and normal controls had no significant difference (P>0.05). The preoperative serum level of MMP-3 of patients whose neoplasms infiltrating meet or exceed the serosa layer was significantly higher than those below the serosa layer (32.60±10.05ng/ml vs 24.43±4.56ng/ml, P<0.05)., The serum MMP-3 levels of patients with lymph node metastasis was significantly higher than those without lymph node metastasis (32.11±9.79ng/ml vs 22.55±3.41ng/ml, P<0.05); And preoperative serum MMP-3 level was closely related with TNM stage(34.26±9.30ng/ml vs 25.10±7.71ng/ml, P<0.05).But the preoperative serum level of MMP-3 in patients with gastric cancer had no significant correlation with sex, age, tumor size, location and degree of differentiation (P>0.05). In gastric cancer, MMP-3 mainly localizes in the cytoplasm of gastric cancer cells and (or) cell membrane, the positive rate was 68% (34/50 cases); but the adjacent normal tissues was seen weak positive staining;the positive rate was 20%(10/50 cases). The expression of MMP-3 of gastric cancer tissues was significantly higher than that in adjacent tissues (P<0.05). The positive expression of MMP-3 was closely related with TNM stage of gastric cancer, lymph node metastasis (P<0.05);while had no significant correlation with sex, age, tumor size, location, differentiation and invasion depth (P>0.05). The preoperative serum level of MMP-3 showed consistency with expression of MMP-3 in gastric cancer(P<0.05). In gastric cancer, VEGF-C mainly localizes in the cytoplasm of gastric cancer cells; the positive rate was 50% (25/50 cases);while the adjacent tissues was negative expression. The positive expression of VEGF-C was closely related with the degree of gastric cancer invasion and lymph node metastasis (P<0.05),while had no significant correlation with sex, age, tumor size, location, degree of differentiation and TNM staging (P> 0.05). The expression of VEGF-C was positively correlated with that of MMP-3(rs=0.360, P<0.05).
     Conclusion:VEGF-C and MMP-3 have an important role in tumor invasion and metastasis. The detection of preoperative and postoperative serum levels of MMP-3 may have important clinical significance in predicting invasion and metastasis of gastric cancer, also in determining prognosis of gastric cancer.
引文
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