机构地区:[1]上海交通大学医学院附属仁济医院病理科,上海200127
出 处:《临床与实验病理学杂志》2007年第6期690-693,共4页Chinese Journal of Clinical and Experimental Pathology
基 金:上海市卫生局基金资助(044003)
摘 要:目的探讨甲状腺转录因子-1(thyroid transcription factor-1,TTF-1)在肿瘤诊断与鉴别诊断中的应用。方法应用免疫组化方法研究TTF-1在8种临床常见肿瘤中的表达,选用来自两家公司的TTF-1抗体,其克隆号分别为8G7G3/1(Dako)和SPT24(Novocastra)。结果收集临床常见肿瘤标本160例,包括肺、甲状腺、肝脏、胃、结直肠、肾、乳腺及卵巢癌各20例。(1)在甲状腺和肺腺癌中,克隆号为8G7G3/1(Dako)的TTF-1其阳性表达率分别为70%(14/20)和80%(16/20),克隆号为SPT24(Novocastra)的TTF-1其阳性表达率分别为95%(19/20)和100%(20/20)。TTF-1的阳性信号定位于细胞核。(2)在肝细胞性肝癌中,8G7G3/1的阳性表达率为80%(16/20),而周围正常或良性病变(包括肝硬化、炎症及腺瘤)的肝细胞呈100%(20/20)阳性表达。其阳性信号定位于细胞质。相反,SPT24均呈阴性反应。(3)在胃、结直肠及卵巢癌中,8G7G3/1的阳性表达率分别为10%(2/20)、5%(1/20)和20%(4/20),信号定位于细胞质;而SPT24的阳性表达率为分别为40%(8/20)、10%(2/20)和10%(2/20),信号定位于细胞核。(4)在乳腺癌中,两种不同来源的TTF-1抗体在细胞核及细胞质都呈浅黄色均一性的非特异性表达。(5)TTF-1在肾细胞癌中不表达。结论(1)TTF-1(8G7G3/1及SPT24)在细胞核的阳性表达是肺及甲状腺癌的重要特征。(2)TTF-1(8G7G3/1)可作为肝细胞性肝癌诊断与鉴别诊断的重要标记物之一。(3)克隆号分别为8G7G3/1(Dako)和SPT24(Novocastra)的TTF-1在本质上是两种具有不同分子量及长短的蛋白多肽,在免疫组化检测中具有不同的表达方式,临床实际应用时需注意抗体来源的选择。Purpose To investigate the significance of thyroid transcription facor-1 (TTF-1) in the diagnosis and differential diagnosis of the tumors. Methods The expression of TTF-1 was examined immunohistochemmically in eight kinds of clinical common tumorsby using antibodies with two different clones (8G7G3/1 from Dako,SPT24 from Novocastra). Results We collected 160 tumors including 20 pulmonary,thyroid,hepatocellular,gastric ,colorectal,renal cell, breast and ovarian cancers each. (1) Seventy percent (14/20) of thyroid carcinomas and 80% (16/20) of pulmonary adenocarcinomas displayed nuclear staining for 8G7G3/1. The positive rates were higher,95% (19/20) and 100% (20/20) when using SPT24. (2) In liver,8G7G3/1 revealed positive staining in the cytoplasm in 80% (16/20) of hepatocellular carcinomas, and in 100% of peripheral normal hepatocyte or benign lesions including cirrhosis, hepatitis and adenoma. However,SPT24 was negative in all of the cases. (3) The rate of 8G7G3/1 expression which was located in the cytoplasm in gastric,colorectal and ovarian cancers was 10% (2/20) ,5% (1/20) and 20% (4/20) ,respectively. The rate of SPT24 expression located in the nucleus was 40% (8/20) ,10% (2/20) and 10% (2/20) ,respectively. (4) In breast carcinoma, the two antibodies showed nonspecific immuno-staining in both cytoplasm and nucleus. (5) No TTF-1 expression was observed in renal cell carcinomas. Conclusions ( 1 ) The expression of TTF-1 in the nucleus is an important feature in thyroid and pulmonary carcinoma. (2) 8G7G3/1 could be served as one of the reliable marker in the diagnosis and differential diagnosis of hepatocellular carcinomas. (3) 8G7G3/1 and SPT24 were two kinds of polypeptides with different molecular weight and peptide chain length and they therefore have different pattern of immunoreaction. A suitable clone of TTF-1 should be chosen for the clinical practical application.
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