一种新的胸腺素α原cDNA

我们克隆了有中国人特征的胸腺素α原全长ｃＤＮＡ,并进行测度分析。方法从健康中心人ＰＢＭＣＰｏｌｙ（Ａ）＾＋ＲＮＡ中采用ＲＴ－ＰＣＲ法克隆ｈｕＰＴＭＡαｃＤＮＡ,酶切鉴定,序列分析,结果经测序后发现该基因是一个国外的高加索人种胸腺素α原有８６．４％,同源性的新基因。结论从中国人中新发现了一个ｈｕＰＴＭＡα基因,并于日前被美国ＮＣＢＩ（ＮａｔｉｏｎａｌＣｅｎｔｅｒ ｏｆ ｂＩＯＴＥＣＨＮＯＬＯＧＹｉＮ     

四格表数据Meta分析的简明统计方法

为临床医生进行循证医学研究时能更加方便地应用Meta分析,根据 "四格表"资料的Mantel-Haenszel法及Peto法的Meta分析,介绍一种简便的统计方法,其统计结果与原方法完全相同.这种简明的Meta分析的方法对临床医生在作多个研究资料的综合分析时具有良好的实用性,对促进临床医生开展循证医学的研究十分有益.     

Malignant intraperitoneal neoplasms of childhood

Objective. The purpose of this paper is to review and categorize the CT appearances of primary and secondary intraperitoneal neoplasms in children. Materials and methods. We retrospectively reviewed the CT images of 14 cases of intraperitoneal neoplasms. They were reviewed for bowel wall thickening, mesenteric nodules, ascites, calcification, peritoneal nodules, omental caking, and contrast enhancement. Results. Computed tomography images of 14 cases of intraperitoneal neoplasms were evaluated: rhabdomyosarcoma (5), lymphoma (3), neuroblastoma (2), germ cell tumor (1), mesothelioma (1), Wilms tumor (1), and hepatocellular carcinoma (1). Nodular enhancement was seen in all cases, ascites in most, significant bowel wall thickening only with lymphoma, and calcification only with germ cell tumors. Omental caking was present both with rhabdomyosarcoma and lymphoma. Conclusions. While rare in pediatrics, intraperitoneal neoplasms occur in children, and CT is useful in identifying these peritoneal neoplasms. Received: 7 August 1997 Accepted: 9 December 1997     

Pulmonary tuberculosis in five young infants with nursery exposure: clinical, radiographic and CT findings

Clinical, radiographic (n = 5) and CT findings (n = 4) of five Korean infants ranging in age from 2 to 3 months with confirmed tuberculosis were retrospectively analysed. All of the patients were symptomatic, anergic to tuberculin, and had a positive culture of Myobacterium tuberculosis in gastric aspirates. The probable source of infection was the hospital in which they were born. CT scans demonstrated hilar and mediastinal lymph node enlargement with central low attenuation and peripheral enhancement in all cases. CT may be useful in diagnosis by demonstrating characteristic adenopathy and disseminated disease in young infants. Received: 2 September 1997 Accepted: 23 April 1998     

The therapeutic effect of intratumoral injection of GM-CSF gene-modified allogenic macrophages on tumor-bearing mice

Both the antigen presenting ability and the cytotoxicity of macrophages can be enhanced by GM-CSF gene transfer. In the present study, the therapeutic effect of intratumoral injection with GM-CSF gene-modified allogenic macrophages on tumor-bearing mice observed. The peritoneal macrophages of C57BL/6 mice were transfected with GM-CSF gene mediated by recombinant adenovirus and the subcutaneous CT26 colon adeno-carcinoma-bearing BALB/c mice were treated by intratumoral injection of the above macrophages. The survival time of the tumor-bearing mice were prolonged significantly and some tumor mass disappeared completely. The necroses of the tumor cells and massive infiltration of inflammatory cells were observed 6 days after treatment 30 days after treatment, only the leftover of tumor cells and the inflammatory cells remained. The data indicated that introtumoral injection of GM-CSF gene-modified allogenic macrophages displayed more potent therapeutic effect on the preestablished tumor-bearing mice. Supported by National High Biotechnology Foundation (Z20-01-03). This is one of papers of the special issue on gene therapy research (Chin J Cancer Res Vol. 9 No. 4 December, 1997).     

Globotriaosyl Ceramide and Globoside as Major Glycolipid Components of Fibroblasts in Scirrhous Gastric Carcinoma Tissues

Scirrhous gastric cancer is characteristic in that cancer cells proliferate and invade with prominent fibrosis. To search for the expression of specific carbohydrate chains in scirrhous gastric cancer, we have examined the glycosphingolipid composition of scirrhous cancer tissues (n=10) in comparison with that of non-scirrhous cancer tissues (n=10) by means of two-dimensional thin layer chromatography, followed by fast atom bombardment mass spectrometry of the individual glycolipids and immunostaining analysis. The major neutral glycosphingolipids from scirrhous gastric cancer tissues were identified as ceramide monohexoside, ceramide dihexoside, globotriaosyl ceramide (Gb₃) and globoside (Gb₄), while the major acidic glycosphingolipids were II³ Neu-Acα-LacCer, II³ NeuAcα₂-LacCer and sulfatide. Relative concentrations of Gb₃ and Gb₄ in scirrhous gastric cancer tissues (Gb₃+ Gb₄=58%) were two times higher than those in non-scirrhous gastric cancer tissues (29%). Orthotopic fibroblasts cloned from scirrhous gastric cancer tissues showed similar high concentrations of Gb₃ and Gb₄ to scirrhous gastric cancer tissues. Furthermore, immunohistochemical study revealed that Gb₃ and Gb₄ were expressed intensely on the fibroblasts. On the other hand, analysis of glycosphingolipids in four scirrhous gastric cancer cell lines yielded the following results. i) The contents of Gb₃ and Gb₄ were low (6%), compared with orthotopic fibroblasts (62%). ii) Significant amounts of Le^a (pentaglycosylceramide) and Le^b (hexa- and heptaglycosylceramides), which could not be detected in scirrhous cancer tissues, were observed. The results show that the major neutral glycosphingolipids such as Gb₃ and Gb₄ of scirrhous gastric cancer tissues were derived from orthotopic fibroblasts and not from the cancer cells.     

双特异性抗体治疗肿瘤的可行性研究

肽图分析是验证rhIL-2的重要手段之一.rhIL-2具有133个氨基酸,在其一级结构的序列中有四个甲硫氨酸切点,可用化学裂解的方法将甲硫氨酸肽键打开,进行肽谱分析,以对其进行验证.为了有效地对甲硫氨酸进行裂解,我们用70%甲酸溶解CNBr~2,保持CNBr的高浓度小体积,使rhIL-2在1.5mlEppedorf管中,室温条件下有效地打开甲硫氨酸肽键.同时比较了CNBr浓度、裂解时间以及在不同浓度的梯度胶中作SDS-PAGE对实验结果的影响,确定了最佳的实验条件,获得了良好的实验结果.本文虽以rhIL-2为例,但对所有带甲硫氨酸的细胞因子均可用本方法进行肽图分析.     

CD44分子的表达与喉癌颈淋巴结转移的相关性研究

目的 研究CD_44分子在喉癌组织中的表达及其与颈淋巴结转移的关系.方法 应用亲和免疫组织化学法(ABC法)对喉癌、喉乳头状瘤、喉白斑组织的CD_44分子进行了免疫组织化学检测.结果10例喉乳头状瘤及9例白斑病变CD_44均为低表达.45例喉癌中高分化鳞癌CD_44表达明显低于低分化鳞癌(P<0.005);伴颈淋巴结转移的喉癌CD_44表达明显高于无颈淋巴结转移的喉癌组织(P<0.001);T_3、T_4期喉癌CD_44表达明显高于T_1、T_2期(P<0.001).结论 喉癌组织CD_44分子的表达与喉癌组织分化、颈淋巴结转移及临床分期均密切相关,提示CD_44分子能客观反映喉癌组织的分化状态、肿瘤进展及转移潜力.CD_44高表达者侵袭力强,转移倾向明显.     

组织蛋白酶D表达对乳腺癌预后的意义

 用免疫组化法检57例乳腺癌患者的Cath-D在乳腺癌组织中间质细胞和癌细胞的表达情况。结果表明：间质细胞Cath—D的表达强度高于癌细胞（P＜0.01）；Cath—D阳性表达与乳腺癌的淋巴结转移呈正相关（P＜0.005）与五年生存期呈负相关（P＜O.0O5）；在无淋巴结和小于4个转移的病例中，间质Cath—D阳性表达与五年生存期呈负相关（P＜0.005），而癌细胞的阳性与淋巴结转移情况和五年生存期的关系无统计学意义。本研究提示乳腺癌间质Cath—D表达能作为预测乳腺癌预后因素之一。对选择高危人群进行针对性治疗有意义。     

放疗联合化疗治疗复发直肠癌的临床研究

目的探讨放疗联合化疗治疗复发直肠癌的临床效果。方法对２９例根治术后复发的直肠癌进行了放射治疗，其中１６例同时给予大剂量醛氢叶酸（ＣＦ），氟脲嘧啶（５ＦＵ）的全身化疗（观察组），１３例为单纯放疗（对照组）。结果观察组中局部症状缓解率较对照组高，两组有效率分别为８１．２５％、４６．１６％，有显著性差异（Ｐ＜０．０５），完全缓解分别为１８．７５％、７．６９％。两组放疗引起的局部毒性反应相似。结论ＣＦ／５Ｆｕ配合放射治疗复发直肠癌可提高近期疗效，尤其对于伴远外转移患者为理想、安全的治疗手段。