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《肿瘤学》

胃肠道肿瘤患者血清sCD44v6测定及临床意义(附68例报告)

发表时间:2011-04-27  浏览次数:406次

  作者:刘阿林,周民 作者单位: 1 225512 江苏泰州,姜堰市苏陈人民医院    2 213003 江苏常州,南京医科大学附属常州第二人民医院肿瘤科

  【摘要】 目的 探讨血清可溶性细胞表面分化抗原sCD44v6的测定及其临床意义。方法 用酶联免疫吸附试验法(ELISA)检测68例胃肠癌病人血清sCD44v6水平,同时测定35例正常体检病人血清sCD44v6水平作为对照。结果 肠癌组sCD44v6水平(315.67±114.19)ng/ml,胃癌组为(302.53±79.0)ng/ml,两组比较无统计学意义(P>0.05),但两组皆显著高于正常对照组的(45.6±9.5)ng/ml(P<0.01)。肠癌和胃癌伴转移组sCD44v6水平(421.9±68.09)ng/ml,未转移组(257.68±82.84)ng/ml,转移组显著高于未转移组(P<0.01)。结论 sCD44v6水平与胃肠癌及其转移有明显关联,可作为胃肠癌定性诊断及判断转移的参考指标。

  【关键词】 肿瘤;CD44;酶联免疫吸附试验

  Determination and clinic significance of sCD44v6 in patients with gastrointestinal cancer

  LIU A-lin,ZHOU Min.

  Suchen People’s Hospital of Jiangyan,Taizhou 225512,China

  【Abstract】 Objective To explore the determination and the significance of serum sCD44v6 in patients with gastrointestinal cancer.Methods The concentration of serum sCD44v6 was detected in 68 patients with gastrointestinal cancer by means of enzyme-linked immunosorbent assay. As a control, meanwhile, the sCD44v6 level was also done in 35 healthy persons.Results The concentration of serum sCD44v6 was 315.67±114.19ng/ml in patients with intestinal cancer, and that was 302.53±79.0ng/ml in those with gastric cancer. There was no remarkedly difference of the concentration of serum sCD44v6 between the two groups(P>0.05), but it was significant higher when compared with that of the control group (45.6±9.5ng/ml) (P<0.01). When metastasis occured, the concentration of serum sCD44v6 rose and was markedly higher than that in patients with no metastasis(P<0.01). Conclusion The concentration of serum sCD44v6 was associated with the occurance and metastasis of gastrointestinal cancer. And sCD44v6 may become an important parameter which could indicate the diagnosis and prognosis of gastrointestinal cancer.

  【Key words】 neoplasia; CD44; enzyme-linked immunosorbent assay

  CD44是由单一基因所编码的具有高度异质性的单链膜表面糖蛋白家族,可与多种配体结合,介导细胞与细胞、细胞与细胞外基质之间的黏附作用,发挥广泛的生物学功能。CD44包括标准体(standard isoform of CD44,CD44s)及其拼接变异体(variant isoform of CD44, CD44v)。拼接变异体有十多种,CD44v6为其中之一。据报道,CD44v6与胃癌、肠癌等肿瘤的侵袭及其转移和预后有密切关联,有望成为一种新的肿瘤标记物[1~3]。我们通过检测胃肠癌病人血清可溶性CD44v6(sCD44v6)水平并结合临床资料,探讨其临床意义。

  1 资料与方法

  1.1 病例来源

  胃肠癌病人68例,均经胃镜或肠镜检查和手术后病理切片证实。其中:胃癌38例(转移组11例,未转移组27例),肠癌30例(转移组10例,未转移组20例)。68例病人男36例,女32例,年龄37~75岁,中位年龄61岁。正常体检病人35例作为对照,其中男19例,女16例,年龄40~78岁,中位年龄62岁。两组病人性别构成和年龄比较无统计学意义。

  1.2 标本获取

  胃肠癌组病人于手术前一日早晨抽取外周血5ml,所有标本于手术后病理检查确诊后,根据有无转移分别归入转移组和未转移组。对照组同样于晨间抽取外周血5ml。所有标本于分离血清后保存-20℃冰箱中待检。

  1.3 主要试剂和仪器

  sCD44v6试剂盒,奥地利Bender公司生产。ELISA检测采用Bio-680型酶标仪。

  1.4 sCD44v6检测

  ELISA操作根据试剂盒说明书。将收集到的标本和试剂盒提供的标准品一次性检测,同时设立复孔空白对照、阴性对照、阳性对照。根据标准品定值和吸光度(A)值绘制标准曲线。根据每孔最后所得的A值,查标准曲线可得该标本的sCD44v6含量。

  1.5 统计学方法

  计量资料用均数±标准差(x±s)表示,统计学分析用t 检验或方差分析;计数资料统计学分析用χ2检验。

  2 结果

  正常对照组、胃癌组、肠癌组、非转移组和转移组血清sCD44v6水平见表1。其中,胃癌组和肠癌组患者外周血sCD44v6含量显著高于对照组(P<0.01),胃癌组和肠癌组比较无统计学意义(P>0.05),转移组显著高于非转移组(P<0.01)。表1 不同组别肿瘤患者sCD44v6水平的比较(略)注:与对照组比较,*P<0.01;与胃癌组比较,△P>0.05;与非转移组比较,**P<0.01

  3 讨论

  人类CD44基因位于11号染色体短臂上,有20个高度保守的外显子,其转录产物主要是CD44s及CD44v。恶性肿瘤细胞CD44v表达明显增加,过度表达CD44v的肿瘤细胞更易出现淋巴结及远处转移。Hong等[4]发现CD44v6的表达与胃癌浸润性生长,浸润深度,淋巴结转移和远处转移明显相关,认为CD44v6在肿瘤组织中高表达是肿瘤浸润性强的标志。Wielenga和Mulder[5,6]发现CD44v6表达在伴有淋巴结转移的大肠癌组织中,其表达比不伴淋巴结转移的明显增强,认为CD44v6表达情况有重要价值。sCD44v6是CD44v6胞外脱落于血清中的表现形式。分子生物学研究表明,CD44及其拼接变构体在胃肠癌的发生、发展中起重要作用,其中尤以sCD44v6与胃肠癌的关系最为密切。

  本组结果显示:胃肠道肿瘤患者血清中sCD44v6水平明显高于正常对照组;转移组sCD44v6水平明显高于未转移组,提示sCD44v6可能在肿瘤的发生和转移中起作用,这与已有的分子生物学研究结果[7]一致。传统判断肿瘤是否发生转移的方法需要通过影像学、活检、手术后病理切片等手段证实,一般手术前很难做出准确的判断;部分不能接受手术或手术不能根除者,鉴于sCD44v6与胃肠癌之间的关联性,在决定其他治疗方案时具有重要的参考价值。

  【参考文献】

  1 Finke LH, Terpe HJ, Zorb C, et al. Colorectal cancer prognosis and expression of exon-v6-containing CD44 proteins. The Lancet,1995,345:583-584.

  2 Yanane N, Tsujitani S, Makino M, et al. Soluable CD44 variant 6 as a prognostic indicator in patients with colorectal cancer. Oncology,1999,56:232-238.

  3 Yamamichi K, Uehara Y, Kitamura N, et al. Increased expression of CD44v6 mRNA significantly correlates with distant metastasis and poor prognosis in gastric cancer. Int J Cancer,1998,79:256-262.

  4 Hong RL, Lee Wj, Shun CT, et al. Expression of CD44 and its clinical implication in diffuse type and intestinal-type gastric adenocarcinomas.Oncology,1995,54(4):334.

  5 Wielenga M, Heider G, Johan A, et al. Expression of CD44 variant proteins in human colorectal cancer is related to tumor progression. Cancer Research,1993,53(15):4754.

  6 Mulder JWR, Kruyt PM, Sewnath M, et al. Colorectal cancer prognosis and expression of exon-v6-containing CD44 proteins.Lancet,1994,344:1470.

  7 Reeder JA, Gotley DC, Walsh MD, et al. Expression of antisense CD44 variant 6 inhibits colorectal tumor metastasis and tumor growth in a wound enviroment. Cancer Res,1998,58:3719-3726.

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