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血清c肽测定临床意义 LRG1在结直肠癌患者血清中的表达及临床意义

点击:0时间:2021-02-24 00:54:22

陈周峰++黄智铭++金瑞放

[摘要] 意图 研讨富含亮氨酸的α-2糖蛋白1(Leucine rich alpha -2 glycoprotein 1,LRG1)在結直肠癌患者血清的表达,评论其临床含义。 办法 共归入65例结直肠癌患者、55例结直肠良性肿瘤患者、50例健康志愿者;别离选用酶联免疫吸附法(Enzyme linked immunosorbent assay,ELISA 法)检测血清LRG1水平,然后对三组患者血清中LRG1和CEA表达水平、结直肠癌血清LRG1与临床肿瘤分期的联络进行统计剖析。 成果 与结直肠良性肿瘤组及健康查体组比较,结直肠癌组血清中LRG1和 CEA水平显着偏高(P<0.01),结直肠良性肿瘤组和正常对照组比较差异无统计学含义(P>0.05);结直肠癌肿瘤分期与患者血清LRG1水平相关,Ⅲ、Ⅳ期恶性肿瘤患者血清LRG1水平显着高于Ⅰ、Ⅱ期恶性肿瘤患者,差异有统计学含义(P<0.01);联合检测与独自检测LRG1比较,差异有统计学含义(Z=2.763,P<0.01);与独自检测比较,联合检测准确率更高,差异有统计学含义(Z=3.034,P<0.01);LRG1与CEA差异有统计学含义(Z=0.752,P<0.05)。 定论 LRG1可作为结直肠癌确诊潜在的生物学符号。

[关键词] 结直肠癌;富含亮氨酸α-2糖蛋白1;癌胚抗原;肿瘤标志物

[中图分类号] R735.34;R730.43 [文献标识码] A [文章编号] 1673-9701(2017)26-0001-03

Expression of LRG1 in serum of patients with colorectal cancer and its clinical significance

CHEN Zhoufeng HUANG Zhiming JIN Ruifang

Department of Gastroenterology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China

[Abstract] Objective To study the expression of leucine-rich alpha-2 glycoprotein 1 (LRG1) in serum of patients with colorectal cancer and to explore its clinical significance. Methods A total of 65 patients with colorectal cancer, 55 patients with colorectal benign tumors and 50 healthy volunteers were enrolled. Serum LRG1 levels were measured by enzyme-linked immunosorbent assay(ELISA), and then the levels of LRG1 and CEA in serum were compared between the three groups. The relationship between serum LRG1 and clinical stage was analyzed statistically. Results Compared with those of colorectal benign tumor group and healthy examination group, the levels of LRG1 and CEA in colorectal cancer group were significantly higher(P<0.01), and there was no significant difference between colorectal benign tumor group and normal control group(P>0.05). The stage of colorectal cancer was correlated with the level of serum LRG1.The level of serum LRG1 in patients with stage Ⅲ and Ⅳ malignant tumor was significantly higher than that in patients with stage Ⅰ and Ⅱ malignant tumor, and the difference was statistically significant (P<0.01). There was significant difference between the combined detection and separate detection of LRG1(Z=2.763, P<0.01). Compared with that of separate detection, the accuracy of combined detection was higher, and the difference was statistically significant (Z=3.034, P<0.01). There was significant difference between LRG1 and CEA (Z=0.752, P<0.05). Conclusion LRG1 can be used as a potential biomarker for the diagnosis of colorectal cancer.endprint

[Key words] Colorectal cancer; Leucine rich alpha-2 glycoprotein 1; Carcinoembryonic antigen; Tumor markers

结直肠癌(colorectal cancer,CRC)是全世界第三大常见的癌症,是全世界癌症逝世的首要原因之一[1]。如果在前期阶段发现肿瘤,预后杰出。结肠镜查看是最牢靠的确诊结直肠癌的依据,但结肠镜大规模筛查比较难完成。因而,灵敏性、特异性高的血清肿瘤标志物是很有含义的。癌胚抗原(Carcinoembryonic antigen,CEA)是临床上常用的肿瘤标志物,在多种肿瘤中表达升高。富含亮氨酸的α-2糖蛋白1(LRG1)是富亮氨酸重复序列(leucine-rich repeat,LRR)宗族的成员之一,1977年初次从人类血清别离出[2]。研讨已证真实蛋白质相互效果下LRG1可以对信号转导、细胞粘附等发生效果,该机制与细胞存活、搬迁有着密不可分的联络[3]。跟着临床研讨的不断开展,LRG1在肺癌、胰腺癌等肿瘤中的高表达得到医学界的广泛认可[5]。本研讨别离选用酶联免疫吸附法(ELISA 法)检测结直肠癌患者、结直肠良性肿瘤患者及健康志愿者血清LRG1水平缓CEA水平,评论LRG1在结直肠癌的确诊价值,现报导如下。

1 目标与办法

1.1研讨目标

选取2016年1~11月期间在我院承受医治的65例结直肠癌患者作为结直肠癌组,经过病理学确诊确诊为结直肠癌,其间男32例,女33例,年纪29~75岁,均匀(50.90±9.50)岁。归入规范:①契合结直肠癌的临床确诊规范;②结直肠癌初诊患者;③患者未承受过放、化疗及生物医治[6]。扫除规范:①存在其他类型肿瘤疾病;②结直肠癌复发或术后患者;③存在严重心、肝、肾功能疾病及免疫系统疾病患者;④术前承受其他办法医治患者;⑤妊娠期患者;⑥不依从、不合作医治患者[7]。选取我院结肠息肉医治患者55例为结直肠良性肿瘤组,术后病理学确诊为初级别上皮内瘤变或结肠增生性息肉,其间男30例,女25例,年纪30~71岁,均匀(44.45±10.94)岁。选取我院查体的健康人50例为健康对照组,结肠镜查看均未见反常。其间男28例,女22例,年纪28~72岁,均匀(42.32±9.23)岁,三组之间性别、年纪等一般材料比较,差异无统计学含义(P>0.05)。

1.2 办法

1.2.1 标本搜集 一切当选者晨起空腹抽取静脉血6 mL搜集在一个真空采血管内,室温下静置30 min,然后2500 r/min给予10 min离心处理,搜集的血清保存于-80℃冰箱。

1.2.2 血清LRG1水平 选用ELISA 法对血清LRG1予以检测,ELISA试剂盒由MYBIOSOURCE公司供给,严厉依照相关阐明操作。对450 nm波利益样品吸光度(OD)值给予ELISA检测。纵坐标为规范物浓度,横坐标为OD值,规范曲线的制作选用的是 CURVE EXKPERT 软件。依据规范曲线回归方程对样品浓度进行核算。

1.2.3 血清CEA水平 严厉依照ELISA检测试剂盒阐明对血清CEA水平予以检测。

1.3 统计学办法

选用SPSS 18.0统计学软件进行剖析,计量材料由中位数、极差表明,并予以Shapiro-Wilk正态性查验。用 Mann-Whitney U查验独立样本均数。制作血清LRG1和CEA受试者作业曲线(receiver operating curve,ROC),并选用AUC对确诊价值予以评价,P<0.05为差异有统计学含义。

2 成果

2.1 三组患者血清中LRG1和CEA表达水平比较

与结直肠良性肿瘤组及健康查体组比较,结直肠癌组血清中LRG1和 CEA水平显着偏高(P<0.01),结直肠良性肿瘤组和正常对照组比较差异无统计学含义(P>0.05)。见表1。

表1 三组患者血清中LRG1和CEA表达水平比较(x±s,ng/mL)

注:a.LGR1结直肠癌组vs健康查体组 Z=-7.384,P<0.01;b.LGR1结直肠癌组vs结直肠良性肿瘤组Z=-6.946,P<0.01;c.CEA结直肠癌组vs健康查体组Z=-6.936,P<0.01;d. CEA结直肠癌组vs结直肠良性肿瘤组Z=-6.093,P<0.01

2.2 结直肠癌血清LRG1与臨床肿瘤分期的联络

结直肠癌肿瘤分期与患者血清LRG1水平相关,Ⅲ、Ⅳ期恶性肿瘤患者血清LRG1水平显着高于Ⅰ、Ⅱ期患者,差异有统计学含义(P<0.01)。见表2。

表2 结直肠癌血清LRG1与临床肿瘤分期的联络

2.3 ROC曲线剖析和确诊评价

以ROC曲线剖析评价LRG1对结直肠癌的确诊价值。将病理学确诊作为金规范,LRG1与CEA其间一项体现为阳性可确诊为阳性,若两者检测均显现阴性,则判别为检测阴性,血清LRG1和CEA水平及联合检测ROC曲线(封三图1)。血清LRG1确诊结直肠癌的临界值及曲线下面积别离为75.50 ng/mL、0.885;血清CEA确诊结直肠癌的临界值为5.25 ng/mL,曲线下面积(AUC)为0.850;联合检测曲线下面积为0.950。联合检测与独自检测LRG1比较较,差异有统计学含义(Z=2.763,P<0.01);与独自检测比较,联合检测准确率更高,差异有统计学含义(Z=3.034,P<0.01);LRG1与CEA差异有统计学含义(Z=0.752,P<0.05)。

3 评论

结直肠癌是人类常见恶性肿瘤,包含结肠癌和直肠癌。结直肠癌的前期无症状,或症状不显着,跟着癌肿开展,症状逐步呈现,因其发病部位不同而体现出不同的临床症状及体征。结直肠癌的确诊首要根据结肠镜查看,血肿瘤符号物癌胚抗原(CEA)检测,有助于结直肠癌的确诊。目前我国临床对结直肠癌的筛查办法缺少灵敏性、特异性及阳性猜测值的生物符号物,因而,对前期确诊生物符号物的研讨火烧眉毛,其关于结直肠癌前期确诊、医治及预后有着重要含义。开始,LRG1的效果是作为炎症反响的标志物发现的。Serada等研讨发现在溃疡性结肠炎中,血清LRG1水平与溃疡性结肠炎的炎症活动相关,比C反响蛋白愈加灵敏[8-14]。随后,有其他学者发现,LRG1在胰腺癌、肝癌、卵巢癌、肺癌等多种恶性肿瘤的表达升高,其表达量与恶性肿瘤的疾病发展、淋巴结搬运密切相关[4-5]。本文经过ELISA检测结直肠癌患者血清LRG1,发现其较结直肠良性肿瘤及健康人群的血清显着升高,且LRG1水平与肿瘤发展相关。endprint

血清CEA作為临床上常用的肿瘤标志物,其确诊结直肠癌及判别肿瘤分期有必定局限性。而血清LRG1联合血清CEA确诊结直肠癌的灵敏性和特异性高于独自检测CEA。本研讨成果表明,与结直肠良性肿瘤组及健康查体组比较,结直肠癌组血清中LRG1和 CEA水平显着偏高(P<0.01),结直肠良性肿瘤组和正常对照组比较差异无统计学含义(P>0.05);结直肠癌肿瘤分期与患者血清LRG1水平相关,Ⅲ、Ⅳ期恶性肿瘤患者血清LRG1水平显着高于Ⅰ、Ⅱ期恶性肿瘤患者,差异有统计学含义(P<0.01);ROC曲线剖析来评价LRG1对结直肠癌的确诊价值。将病理学确诊作为金规范,LRG1与CEA其间一项体现阳性可确诊为阳性,若两者检测均显现阴性,则判别为检测阴性。血清LRG1确诊结直肠癌的临界值及曲线下面积别离为75.50 ng/mL、0.885;血清CEA确诊结直肠癌的临界值为5.25 ng/mL,曲线下面积为0.850;联合检测曲线下面积(AUC)为0.950。联合检测与独自检测LRG1比较较,差异有统计学含义(Z=2.763,P<0.01);与独自检测比较,联合检测准确率更高,差异有统计学含义(Z=3.034,P<0.01);LRG1与CEA差异有统计学含义(Z=0.752,P<0.05),与近期其他的文献报导成果共同,提示LRG1水平与结直肠癌密切相关,结合血清CEA检测可为结直肠癌的确诊供给价值[15-20]。

总归,LRG1可作为结直肠癌确诊潜在的生物学符号,值得临床充沛注重。

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(收稿日期:2017-06-13)endprint

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