肝细胞癌和肝硬化组织中增殖细胞核抗原及Ki-67抗原的表达及意义

为探讨肝细胞癌 (HCC)和肝硬化组织中增殖细胞核抗原 (PCNA)及 Ki- 67抗原的表达及意义 ,采用免疫组织化学技术检测 PCNA和 Ki- 67抗原在 HCC和肝硬化组织中的标记指数 (L I)。结果显示 , 、 、 级 HCC的 PCNA L I分别为 (2 6.9± 17.4) %、 (3 3 .1± 2 2 .7) %、 (73 .8± 16.3 ) % ,各级之间差异均有显著性(P均 <0 .0 5 ) ;Ki- 67L I分别为 (2 5 .8± 15 .6) %、 (5 8.2± 18.6) %、 (75 .3± 2 0 .2 ) % ,各级之间差异均有显著性 (P均 <0 .0 5 ) ;但各级 HCC中的 PCNA L I和 Ki- 67L I差异均无显著性 (P均 >0 .0 5 )。肝硬化组织中 PCNAL I为 (8.8± 5 .2 ) % ,Ki- 67L I为 (7.9± 4.4) % ,两者之间差异无显著性 (P>0 .0 5 )。提示 HCC及肝硬化组织中 PCNA和 Ki- 67抗原的阳性率基本一致 ,HCC的分化程度与 PCNA或 Ki- 67密切相关 ;原位检测 HCC组织中PCNA或 Ki- 67抗原的表达 ,有助于判断 HCC分化程度及预后     

原发性肝细胞癌细胞凋亡、增殖与肿瘤分化程度的关系

为探讨原发性肝细胞癌（HCC）中细胞增殖和凋亡与肿瘤分化程度的关系，采用免疫组化法对50例HCC患者（HBsAg均阳性）癌细胞增殖细胞核抗原Ki-67的表达进行了定位和半定量分析，并用Tunel法对细胞凋亡进行检测。结果显示，Ki-67以棕黄色颗粒状位于细胞核膜中，胞膜和胞质中阴性。认为HCC细胞中Ki-67和凋亡表达与HCC的分化程度有关；HCC细胞中增殖／凋亡失调是导致HCC发展的重要原因，诱导HCC中细胞亡或抑制其增殖，可望提高临床治疗效果。     

Histopathology, cell proliferation indices and clinical outcome in 304 patients with mantle cell lymphoma (MCL): a clinicopathological study from the European MCL Network

Mantle cell lymphoma (MCL) is a distinct lymphoma subtype with a particularly poor clinical outcome. The clinical relevance of the morphological characteristics of these tumours remains uncertain. The European MCL Network reviewed 304 cases of MCL to determine the prognostic significance of histopathological characteristics. Cytomorphological subtypes, growth pattern and markers of proliferation (mitotic and Ki-67 indices) were analysed. In addition to the known cytological subtypes, classical (87.5%), small cell (3.6%), pleomorphic (5.9%) and blastic (2.6%), we identified new pleomorphic subgroups with mixtures of cells (classical + pleomorphic type; 1.6%) or transitions (classical/pleomorphic type; 1.6%), which, however, did not differ significantly in overall survival time. Exactly 80.5% of cases displayed a diffuse growth pattern, whereas 19.5% of cases had a nodular growth pattern, which was associated with a slightly more favourable prognosis. A high proliferation rate (mitotic or Ki-67 indices) was associated with shorter overall survival. Cut-off levels were defined that allowed three subgroups with different proliferation rates to be discriminated, which showed significantly different clinical outcomes (P < 0.0001). Based on this large clinicopathological study of prospective clinical trials, multivariate analysis confirmed the central prognostic role of cell proliferation and its superiority to all other histomorphological and clinical criteria.     

Apoptosis and cell proliferation in the development of gastric carcinomas: associations with c-myc and p53 protein expression

BACKGROUND AND AIM: Patients with gastric carcinomas have a poor prognosis and low survival rates. The aim of the present paper was to characterize cellular and molecular properties to provide insight into aspects of tumor progression in early compared with advanced gastric cancers. METHODS: One hundred and nine graded gastric carcinomas (early or advanced stage, undifferentiated or differentiated type) with paired non-cancer tissue were studied to define the correlation between apoptosis (morphology, terminal deoxyribonucleotidyl transferase-mediated dUTP-digoxigenin nick end-labeling), cell proliferation (Ki-67 expression, morphology) and expression and localization of two proteins frequently having altered expression in cancers, namely p53 and c-myc. RESULTS: Overall, apoptosis was lower in early stage, differentiated and undifferentiated gastric carcinomas compared with advanced-stage cancers. Cell proliferation was comparatively high in all stages. There was a high level of p53 positivity in all stages. Only the early- and advanced-stage undifferentiated cancers that were p53 positive had a significantly higher level of apoptosis (P < 0.05). Cell proliferation was significantly greater (P < 0.05) only in the early undifferentiated cancers that had either c-myc or p53-positivity. CONCLUSIONS: The results indicate that low apoptosis and high cell proliferation combine to drive gastric cancer development. The molecular controls for high cell proliferation of the early stage undifferentiated gastric cancers involve overexpression of both p53 and c-myc. Overexpression of p53 may also control cancer development in that its expression is associated with higher levels of apoptosis in early and late-stage undifferentiated, cancers.     

Helicobacter pylori infection accelerates human gastric mucosal cell proliferation

Helicobacter pylori causes chronic atrophic gastritis and intestinal type gastric cancer arises against a background of atrophic gastritis. Increased proliferation of epithelial cells is an important indicator of increased risk for gastric adenocarcinoma. We investigated gastric mucosal cell proliferation inH. pylori-associated gastritis and the effect of eradication therapy on this proliferation in 45 patients endoscopically diagnosed (31 with persistent eradication and 14 in whomH. pylori) recurred.H. pylori status was determined by culture and histology in biopsied specimens from the gastric antrum and corpus. Eradication of the infection was defined as reversal to negative on both tests. In vitro Ki-67 immunostaining of endoscopic biopsy specimens was used to measure mucosal cell proliferation inH. pylori-associated gastritis before and after therapy. The proliferative zone was defined as the distance of Ki-67-positive gastric epithelial cells between the highest and the lowest cells. In patients in whomH. pylori was eradicated, cell proliferation in both the antral and corpus mucosa had decreased 4 weeks after completion of the eradication therapy (P<0.01,P<0.001), and 6 months later, it had markedly decreased (P<0.05,P<0.05) and returned to normal. In patients in whomH. pylori recurred, only antral epithelial cell proliferation was reduced 4 weeks after eradication therapy, but whenH. pylori recurred, determined by culture and histology, cell proliferation level was the same as that before eradication. These results suggest thatH. pylori infection accelerates cell proliferation in gastric mucosa and may play a causal role in the chain of events leading to gastric carcinoma.     

Relationship of DNA ploidy to hormone receptor status and proliferation in invasive breast carcinoma

Purpose: In 247 primary invasive breast carcinomas, DNA ploidy was related to hormone receptor status, proliferation, and clinical/histopathologic factors. Methods: DNA ploidy analysis was performed by image analysis using imprints. Estrogen (ER) and progesterone (PR) receptor status was determined immunohistochemically. The proliferative activity of the tumours was assessed by Ki-67 antigen labelling. Total observation time was 3.5 years. Results: DNA ploidy analysis revealed a high fraction of tumours with non-peridiploid patterns (78%). Significant correlations between DNA ploidy and ER/PR receptor status (P < 0.01) were found with increased frequencies of peridiploid DNA results in receptor positive tumours. A significant relationship became manifest between DNA ploidy and Ki-67 index showing high frequencies of non-peridiploid DNA patterns in tumours with Ki-67 index >20% (P < 0.01). There was a strong correlation (P < 0.001) between DNA ploidy and histopathologic grading, while tumour size and lymph node status were not correlated to DNA ploidy. Conclusions: The results of our study on invasive breast carcinoma demonstrate that DNA ploidy measured by image analysis is predominantly associated with markers of cell differentiation. Preliminary outcome data reveal a risk-indicating potential of DNA ploidy primarily in cases with favourable results for other prognostic factors. Received: 18 February 2000 / Accepted: 9 May 2000     

DNA ploidy, S-phase, and Ki-67 antigen expression in the evaluation of cell content of pleural effusions

Cells from pleural effusions (28 malignant and 14 nonmalignant with reactive mesothelial cells) were examined in parallel by means of conventional cytology and multiparametric flow cytometry. The latter included the evaluation of DNA ploidy, the calculation of DNA index (DI), the determination of S phase fraction (SPF), and cell proliferation associated with Ki-67 antigen expression. Propidium iodide was used for the DNA staining, and fluorescein-conjugated monoclonal mouse antibodies were applied to the human Ki-67 antigen staining. The specimens were analyzed by the Becton Dickinson (BD) FACScan apparatus. 10⁴ events were collected, and thereafter the obtained data were analyzed by the software Lysis II and CellFit (BD) for DNA and Ki-67 data analysis, respectively. Out of the 28 cases examined, 18 (64%) of the malignant effusions were aneuploid. All of the benign effusions were typically diploid. The average SPF of benign, malignant diploid, and malignant aneuploid cases was 6, 6, and 30 respectively. The comparison between SPF and DI in malignant cases showed a significant correlation (p < 0.001). The average of Ki-67-positive cells that were benign, malignant diploid, and malignant aneuploid were 11, 19, and 35, respectively. There was a significant correlation between Ki-67 expression, SPF (p < 0.05), and the percent of the aneuploid cell population (p = 0.01). The sensitivity of conventional cytology, the determination of DNA ploidy and of Ki-67 expression, was 80, 64, and 92%, respectively; specificity was 100% for cytology and DNA ploidy and 46% for Ki-67 expression. These data show that Ki-67 antigen expression is a potentially useful adjunct to cytometric DNA content analysis, determination of SPF, and conventional cytology in the diagnosis of malignant pleural effusions. Offprint requests to: J. Zeromski     

MAGE-A1在食管癌中的表达及其与肿瘤细胞增殖的关系

目的:研究食管癌中肿瘤特异性抗原MAGE-A1,Ki-67的表达及其相关性,探讨他们与食管癌生物学行为及生存时间的关系.方法:免疫组化SP法,利用鼠抗人MAGE-A1,Ki-67单克隆抗体检测60例食管癌标本中MAGE-A1,Ki-67表达水平.结果:60例食管癌中MAGE-A1表达率为83.3%(50/60),高表达率为10%(6160),低表达率为73.3%(44/60),正常组织表达率为0%,食管癌和正常组织之间的表达具有显著性差异(P＜0.001).Ki-67表达率为93.3%(56/60),高表达率为70%(42/60),低表达率为23.3%(14/60),正常组织表达率为13.3%(4/30),食管癌和正常组织之间的表达具有显著性差异(P＜0.001).MAGE-A1与分化程度有关(P＜0.05),Ki-67与年龄、分化程度、病理类型有关(P＜0.05).MAGE-A1阳性表达的高低与Ki-67阳性表达的高低呈负相关(r=-2.91,P＜0.05).MAGE-A1阳性患者的生存时间明显高于阴性者.结论:MAGE-A1在食管癌中有较高的表达,并且与细胞增殖相关,正常组织不表达,MAGE-A1阳性患者的预后好,有望作为免疫治疗的靶点.     

Telomerase activity significantly correlates with cell differentiation, proliferation and lymph node metastasis in colorectal carcinomas

Telomerase activity was examined by the telomeric repeat amplification protocol assay, in a total of 37 colorectal adenocarcinomas, including stages A, B and C according to the Astler and Collier classification, and correlated with clinicopathological features. Of 17 stage C lesions, 13 were positive (76.5%; P<0.01), demonstrating a significant correlation with lymph node metastasis. In contrast, only 6 of 20 stage A and B␣carcinomas were positive (30.0%), this being significantly lower (P<0.05). Moderately or poorly differentiated subtypes were more predominant in the telomerase-positive than in the telomerase-negative groups (P<0.05) with greater elevation of mitotic and Ki-67 labeling indices (P<0.0001). No significant relation was found between telomerase activity and p53 protein accumulation or Bcl-2 protein expression. The good correlation with tumor staging, lymph node metastasis, differentiation, and mitotic and Ki-67 labeling indices suggests that this parameter might have potential application in estimation of prognosis. Received: 28 February 1998 / Accepted: 30 April 1998     

Nuclear cyclin D1 overexpression is a critical event associated with cell proliferation and invasive growth in gallbladder carcinogenesis

Cyclin D1 overexpression is remarkably frequent in several human carcinomas and is believed to be a critical event in oncogenesis. We examined cyclin D1 expression, p53 expression, and the Ki-67 labeling index by immunostaining in human gallbladder mucosa in conditions varying from normal to malignant tissue. We also examined K-ras codon 12 mutations in these tissues with a two-step polymerase chain reaction. Nuclear cyclin D1 overexpression was observed in 48% of carcinomas occurring independently of adenoma, but not in adenomas, carcinomas arising in adenomas, or nonneoplastic lesions. Cytoplasmic cyclin D1 overexpression was observed in about 15% of abnormal specimens, irrespective of the type of epithelial abnormality. Carcinomas showing nuclear cyclin D1 overexpression had significantly higher Ki-67 labeling indexes than those with no overexpression. Moderately to poorly differentiated adenocarcinomas showed a higher incidence of nuclear cyclin D1 overexpression than papillary to well differentiated carcinomas. Specimens with cyclin D1 overexpression showed a high incidence of lymph permeation, venous permeation, and lymph node metastasis. We conclude that nuclear cyclin D1 overexpression is a critical event importantly associated with cell proliferation and invasive growth in gallbladder carcinogenesis, and that cyclin D1 immunostaining may become a useful marker for evaluating gallbladder carcinomas. Received: March 9, 1999 / Accepted: July 23, 1999     

肝硬化患者肝组织中PCNA和Ki-67的表达

目的:探讨乙型肝炎和丙型肝炎肝硬化患者肝组织中PCNA和Ki-67抗原的表达及意义.方法:选择58例(乙肝肝硬化24例、丙肝肝硬化22例、慢性肝炎12例)肝脏标本,做H-E染色观察肝组织的病理改变;利用天狼红染色切片检测肝组织内胶原纤维的面密度;采用免疫组织化学SP法观察肝组织中PCNA和Ki-67抗原的表达,并检测阳性细胞的标记指数(labelingindex,LI).结果:肝硬化胶原纤维的面密度百分比与慢性肝炎比较(12.2%±3.1%vs1.40%±1.0%,P<0.001)明显增高,乙型与丙型肝炎肝硬化胶原纤维的面密度百分比无明显差异(P>0.05);慢性肝炎与肝硬化比较PCNA和Ki-67LI(34.67%±8.6%vs10.38%±3.76%,2.81%±0.51%vs1.69%±1.03%,均P<0.001)明显增高;丙肝肝硬化与乙肝肝硬化比较PCNA和Ki-67LI(13.12%±1.42%vs6.32%±2.18%,2.48%±0.54%vs0.95%±0.77%,均P<0.001)均明显增高;肝硬化胶原纤维的面密度与PCNA和Ki-6LI之间无相关性(P>0.05).结论:肝硬化组织中肝细胞增殖指数比慢性肝炎低,但丙型肝炎肝硬化的肝细胞增殖指数比乙型肝炎肝硬化高;PCNA和Ki-67LI与肝硬化胶原纤维面密度无相关性.     

Assessment of relationships among clinicopathological characteristics,morphological computer tomography features,and tumor cell proliferation in stage I lung adenocarcinoma

BackgroundSurgically resected stage I lung adenocarcinoma (ADC) has wide variation in prognosis. It is significant to identify high-risk patients and optimize therapeutic strategy. This study aimed to investigate the relationships among histological grade, serum tumor marker index (TMI), morphological computer tomography (CT) features, and a well-established prognosticator cell proliferation (Ki-67) in stage I ADC.MethodsPreoperative CT was performed in 182 patients with stage I ADC confirmed by pathology. The Ki-67 expression was acquired by immunohistochemistry. TMI was the square root of standardized serum carcinoembryonic antigen (CEA) and cytokeratin 19 fragments (CYFRA 21-1) values. Tumor shadow disappearance rate (TDR) and other morphological CT features were interpreted by two radiologists. Histological grade, TMI, CT features were statistically evaluated to explore the associations with Ki-67 expression.ResultsIn univariate analysis, gender, smoking history, pack-year, histological grade, TNM stage (IA and IB), serum CEA and CYFRA 21-1 status, TMI status, as well as TDR, long-axis diameter, short-axis diameter, lobulation, spiculation, attenuation types, vacuolation, vascular invasion, vascular convergence, thickened bronchovascular bundles, pleural attachment and peripheral fibrosis were significantly associated with Ki-67 expression (all P<0.05). Solid-predominant ADC had the highest Ki-67 expression, followed by micropapillary, papillary and acinar-predominant ADC, while lepidic-predominant ADC had the lowest Ki-67 expression (P<0.001). TDR was negatively correlated with Ki-67 (r =−0.478, P<0.001). Multivariate logistic regression analysis revealed that gender, histological grade, TDR and attenuation types were independent factors associated with Ki-67 expression.ConclusionsKi-67 expression differed distinctly according to ADC histological subtypes. High Ki-67 expression is independently associated with male patients of stage I ADC with worse differentiation, lower TDR and solid tumors, which might be of prognostic value for poor prognosis in stage I ADC.     

Platelet-released supernatants enhance hematopoietic stem cell proliferation in vitro

Peripheral blood stem cell transplantation (PBSCT) is used to reconstitute normal hematopoiesis after myeloablative chemotherapy. The hematopoietic stem cells are collected from the blood by apheresis machines using density gradient centrifugation. Because of density similarities the grafts contain high levels of leukocytes and platelets that release various mediators into the grafts. The collected hematopoietic stem cells are therefore exposed to platelet released mediators including platelet-derived growth factor, transforming growth factor-β, vascular endothelial growth factor and platelet factor-4. To investigate whether platelet activation and secretion can affect hematopoietic stem cells during PBSCT, we cultured (i) normal cord blood stem cells and (ii) mobilized peripheral blood stem cells from autografts together with the total secretion product of thrombin activated platelets (i.e. platelet released supernatants). Platelet released supernatants enhanced the cell proliferation of both peripheral blood stem cell (PBSC) autograft and normal cord blood CD34⁺ cells. Our study shows that platelet secretion in PBSCT autografts affect the hematopoietic stem cell function and possibly thereby the hematopoietic reconstitution after PBSCT.     

ⅢA-N2期肺癌新辅助化疗前后Ki-67表达水平与预后关系

目的探讨ⅢA-N2期非小细胞肺癌(NSCLC)新辅助化疗(NCT)前后Ki-67表达水平与预后的关系。方法收集60例ⅢA-N2期NSCLC患者,首先进行新辅助化疗(NCT),再行手术。观察NCT疗效,比较Ki-67表达与临床疗效和预后的关系。结果NCT客观缓解率(ORR)是53.3%。NCT前后癌组织中Ki-67表达阳性率分别为63.2%和43.9%(P<0.05)。临床疗效显著组与疗效不显效组比较,Ki-67表达阳性率较低(31.3%vs 60.0%)(P<0.05)。生存分析显示:Ki-67表达阴性者具有更好的OS和PFS(P<0.01)。单因素分析示:Ki-67表达阴性者有更高的2年PFS和OS。多因素分析示:Ki-67阴性表达是预后的独立危险因素。结论Ki-67表达水平影响临床疗效和预后,Ki-67可作为NSCLC新辅助化疗疗效预测指标。     

三氧化二砷对K562细胞生长及Ki-67和Survivin表达的影响

目的：探讨三氧化二砷(As2O3)对K562细胞生长的影响及K562细胞对As2O3的抵抗机制。方法：以不同浓度As2O3作用于K562细胞后，用四唑盐(MTT)比色法分析细胞的生长增殖，用台盼蓝排斥试验观察细胞活力，流式细胞术检测细胞凋亡以及Ki-67抗原和Survivin的表达。结果：2μmol／L As2O3能明显抑制K562细胞生长，但细胞活力、增殖相关抗原Ki-67的降低和凋亡发生在5μmol／L As2O3作用48h后才较为明显；同时As2O3作用后抗凋亡蛋白Survivin的表达均有不同程度的增加。结论：As2O3能有效抑制K562细胞的生长，但对细胞增殖能力的抑制及凋亡的诱导作用不如前者明显；Survivin的表达增加可能是K562细胞对As2O3诱导凋亡的抵抗机制之一。     

Growth patterns in various macroscopic types of noninvasive intramucosal colorectal carcinoma with special reference to apoptosis and cell proliferation

PURPOSE: Apoptotic cell death and cell proliferation play important roles in the histogenesis and development of colorectal carcinoma. The aim of this study was to examine the relationship between apoptosis and cell proliferation in various macroscopic types of intramucosal colorectal carcinoma in relation to the expression of p53 and bcl-2. METHODS: One hundred forty cases with endoscopically or surgically resected intramucosal colorectal carcinoma were studied. There were 57 cases of polypoid-type carcinomas, 55 cases of superficial-type carcinomas, and 28 cases of granular-type, laterally spreading tumors. Polypoid-type carcinomas were pedunculated, subpedunculated, or sessile polyps. Superficial-type carcinomas were flat lesions with a smooth, even surface. Granular-type, laterally spreading tumors were superficially spreading lesions with aggregates of nodules and a granular surface. Apoptotic cells were identified by thein situ DNA nick end labeling method. Ki-67, p53, and bcl-2 expression were examined immunohistochemically. RESULTS: The superficial-type carcinoma apoptotic index (30.9 percent) was significantly lower than that of polypoid-type carcinoma (54.4 percent) and granular-type, laterally spreading tumor (60.7 percent). The superficial-type carcinoma proliferative index (67.3 percent) was significantly higher than that of polypoid-type carcinoma (42.1 percent) and granular-type, laterally spreading tumor (28.6 percent). In superficial-type carcinomas the proliferative index in p53-positive carcinomas was significantly higher, and the apoptotic index was higher in carcinomas with a lower proliferative index. There was no significant difference in apoptotic index, proliferative index, or p53 protein overexpression betweende novo carcinomas and those that had arisen in precursor adenomas. CONCLUSIONS: The pattern of cell death and proliferation may vary with different macroscopic types of intramucosal colorectal carcinoma. Superficial-type colorectal carcinomas especially demonstrate diminished apoptosis and increased cell proliferation. This may be useful in understanding their biologic behavior.Read at the Meeting of the American Gastroenterological Association, New Orleans, Louisiana, May 17 to 20, 1998.     

NSCLC中WWOX蛋白、erbB2蛋白的表达及其与细胞增殖之间的关系

目的探讨WWOX蛋白、erbB2蛋白在非小细胞肺癌(NSCLC)组织中的表达及与肿瘤细胞增殖之间的关系。方法免疫组化方法检测50例鳞癌,31例腺癌及20例癌旁正常组织中WWOX蛋白、erbB2蛋白的表达,分析其与临床病理指标、肿瘤细胞增殖之间的关系。结果 WWOX蛋白在72.8%的NSCLC中失表达或表达降低,而相邻正常肺组织中有80.0%正常表达。WWOX蛋白的表达与组织类型、腺癌细胞分化程度密切相关(r=0.262,0.457,P0.05),在鳞癌和低分化腺癌中WWOX蛋白失表达或表达降低。肺癌中erbB2蛋白的过度表达与肺癌的临床分期、淋巴结转移相关,WWOX蛋白阳性表达与erbB2负相关(r=-0.239,P0.05),与肿瘤细胞增殖指数也呈负相关(r=-0.252,P0.05)。结论 WWOX蛋白的低表达与erbB2的过表达可以协同判断NSCLC的预后。     

PcG蛋白EZH2在胃癌发生发展过程中的表达及其临床意义

背景:EZH2是表观遗传调控因子PcG蛋白的核心成分,可通过催化组蛋白H3氨基末端第27位赖氨酸发生三甲基化而抑制靶基因表达。研究发现EZH2在前列腺癌、乳腺癌、胃癌等恶性肿瘤组织中表达增高,并与肿瘤进展和预后差相关。目的:探讨EZH2在胃癌发生、发展中的作用和临床意义及其与细胞增殖的关系。方法:应用免疫组化技术检测32例正常胃黏膜、34例慢性非萎缩性胃炎、33例慢性萎缩性胃炎、40例异型增生和69例胃癌组织中EZH2、Ki-67的表达情况,分析EZH2与Ki-67和胃癌临床病理特征之间的相关性。结果:EZH2在正常胃黏膜和慢性胃炎组织中主要表达于腺颈部,在正常胃黏膜、慢性非萎缩性胃炎、慢性萎缩性胃炎和异型增生组织中,其表达水平逐渐增高(P0.05),异型增生与胃癌组织间则无明显差异(P=0.678)。各病变组织中,EZH2与Ki-67的表达水平均呈正相关(P0.01),所有组织中EZH2总体表达水平显著高于Ki-67(P0.01)。胃癌组织中EZH2的表达水平与肿瘤大小、浸润深度、淋巴结转移和TNM分期相关(P0.05)。结论:EZH2过表达是胃癌发生过程中的早期分子事件,其可能通过促进胃腺上皮增殖参与了胃癌的发生、发展过程。     

Colonic mucosal proliferation after pancreaticobiliary diversion in the hamster

The effect of pancreatioobiliary diversion (PBD) on the colonic mucosa was studied in hamsters over 5, 10, and 24 days. Sham-operated animals served as controls. At all three time intervals, experimental animals had increased plasma cholecystokinin concentrations and decreased gastrin concentrations. Five days after PBD, there was an increase in scintigraphically measured [³H]thymidine incorporation into colonic tissue. Correspondingly, there was an increase in the [³H]thymidine DNA labeling index of goblet cells in the colonic mucosa. The total number of cells in the colonic crypt columns were significantly increased on days 5, 10 and 24. Whether this proliferative response in the colon is due to increased release of cholecystokinin, enterolucagon, other aberrations of hormones or growth factors, or simply an increased bile load on the colonic mucosa remains to be clarified. Such further studies may reveal an alternative animal model for studies on risk factors in colonic carcinogenesis.This study was supported by grants from the Swedish National Cancer Association, Cancerfunds of Östergötland County, and the Society of Medicine in Linköping, Sweden.