Biological Significance and the Related Molecular Mechanism of Ets1 mRNA Expression in Lung Cancer by Tissue Microarray(TMA)

Objective： To investigate the expressions and proteins in the pathogenesis, progression of lung molecular mechanism of Ets-1 mRNA, and TGFβ1 and c-Met cancer by tissue microarray （TMA） method. Methods： The expressions of Ets-1 mRNA, and TGFβ1 and c-Met proteins were detected in 89 primary lung cancers, 12 lung cancer with lymph-node metastasis and 12 precancerous lesions by FISH（fluorescence in situ hybridization） and immunohistochemical method, and 10 normal lung tissues were used as controls. Results： The expressions of Ets-1 rnRNA, and TGFβ1 and c-Met proteins were significantly higher in 89 primary lung cancer than in the control group （P〈0.05）. The expressions of Ets-1 mRNA, and TGFβ1 and c-Met proteins were related to lymph node metastasis and clinical stages. There was a positive correlation between the Ets-1 mRNA expression and TGFβ1 and c-Met proteins （P〈0.05）. Conclusion： Ets-1 mRNA, TGFβ1 and c-Met proteins may be related to the pathogenesis, progression and malignant behavior of lung cancer. They may play an important role in prognosis assessment of lung cancer.

HER2 in gastric cancer: Comparative analysis of three different antibodies using whole-tissue sections and tissue microarrays

AIM:To compare the performance of three commercially available anti-human epidermalgrowth factor receptor 2(HER2)antibodies in whole-tissue sections and tissue microarrays(TMAs)of a series of gastric tumors.METHODS:We present a comparative analysis of three anti-HER2 antibodies(HercepTest,4B5 and SP3)using TMA and whole-tissue sections prepared from the same paraffin blocks of 199 gastric adenocarcinomas operated upon between January 2004 and December2008 at a Brazilian cancer hospital.The data on the patients’age,sex,the anatomical location of the tumor and the Lauren’s histological classification were collected from clinical and pathological records.The immunohistochemical(IHC)results were examined by two pathologists and the cases were classified as positive(3+),equivocal(2+)and negative(0 or 1+),according to the criteria of the IHC scoring system of gastric cancer.TMAs and whole-tissue sections were evaluated separately and independently.All cases yielding discordant IHC results and/or scored as 2+were subjected to dual-color in situ hybridization in order to determine the final HER2 status.Besides determining the sensitivity and predictive value for HER2-positive status,we measured the accuracy of each antibody by calculating the area under the receiver operating characteristic(ROC)curve.The agreement between the results obtained using the TMAs and those obtained using the whole-tissue sections was assessed by means of Kappa coefficient.RESULTS:Intratumoral heterogeneity of HER2 expression was observed with all antibodies.HER2-positive expression(3+)in the whole-tissue sections was observed in 23 cases(11.6%)using the 4B5 antibody,in 18 cases(9.1%)using the SP3 antibody and in 10 cases(5.1%)using the HercepTest antibody.In the TMAs,11 positive cases(5.6%)were identified using SP3 antibody,9(4.6%)using the 4B5 antibody and 6(3%)using the HercepTest antibody.The sensitivity using whole-tissue sections and TMA,respectively,was 95.2%and 42.9%with 4B5,90.5%and 66.7%with SP3 and 47.6%and42.9%with HercepTest.The accuracy,calculated from the area under the ROC curve,using whole-tissue sections and TMA,respectively,was 0.91 and 0.79 by 4B5,0.86 and 0.80 by SP3 and 0.73 and 0.71 by HercepTest.The concordance of the results obtained using wholetissue sections and TMA was 97.4%(Kappa 0.75)using HercepTest,85.6%(Kappa 0.56)using SP3 and 84.1%(Kappa 0.38)using 4B5.CONCLUSION:The use of the 4B5 antibody on wholetissue sections was the most accurate IHC method for evaluating HER2 expression in gastric adenocarcinoma.

Identification of Annexin A1 protein expression in human gastric adenocarcinoma using proteomics and tissue microarray

AIM:To study the differential expression of Annexin A1(ANXA1)protein in human gastric adenocarcinoma.This study was also designed to analyze the relationship between ANXA1 expression and the clinicopathological parameters of gastric carcinoma.METHODS:Purified gastric adenocarcinoma cells(GAC)and normal gastric epithelial cells(NGEC)were obtained from 15 patients with gastric cancer by laser capture microdissection.All of the peptide specimens were labeled as18O/16O after trypsin digestion.Differential protein expressions were quantitatively identified between GAC and NGEC by nanoliter-reverse-phase liquid chromatography-mass/mass spectrometry(nanoRPLC-MS/MS).The expressions of ANXA1 in GAC and NGEC were verified by western blot analysis.The tissue microarray containing the expressed ANXA1 in 75 pairs of gastric carcinoma and paracarcinoma specimens was detected by immunohistochemistry(IHC).The relationship between ANXA1 expression and clinicopathological parametes of gastric carcinoma was analyzed.RESULTS:A total of 78 differential proteins were identified.Western blotting revealed that ANXA1 expression was significantly upregulated in GAC(2.17/1,P<0.01).IHC results showed the correlations between ANXA1protein expression and the clinicopathological parameters,including invasive depth(T stage),lymph node metastasis(N stage),distant metastasis(M stage)and tumour-lymph node metastasis stage(P<0.01).However,the correlations between ANXA1 protein expression and the remaining clinicopathological parameters,including sex,age,histological differentiation and the size of tumour were not found(P>0.05).CONCLUSION:The upregulated ANXA1 expression may be associated with carcinogenesis,progression,invasion and metastasis of GAC.This protein could be considered as a biomarker of clinical prognostic prediction and targeted therapy of GAC.

Tissue microarrays in pathological examination of apoptotic acinar cells induced by dexamethasone in the pancreas of rats with severe acute pancreatitis

BACKGROUND: The good therapeutic effects of large dose of dexamethasone on severe acute pancreatitis (SAP) patients have been proved. This study was designed to investigate the influence of dexamethasone on apoptosis of acinar cells in the pancreas of rats with SAP and the protein expression of the apoptosis-regulating genes Bax and Bcl-2. METHODS: Ninety Sprague-Dawley rats with SAP were randomly divided into a model group and a dexamethasone treated group (45 rats in each group), and another 45 rats formed the sham operation group. Survival rates were calculated and gross pathological changes in the pancreas of each group were observed under a light microscope 3, 6 and 12 hours after operation. Tissue microarray technology was applied to prepare pancreatic tissue sections. The changes in Bax and Bcl-2 protein expression levels of pancreatic tissues from each group were assessed by immunohistochemical staining, and TUNEL staining was used to evaluate changes in apoptosis index. RESULTS: The model and treated groups did not differ in mortality at each time point. The pathological score for the pancreas in the treated group was significantly lower than that in the model group at 3 and 6 hours. The positive rates of Bax protein expression in the head and tail of the pancreas in the treated group at all time points were all markedly higher than those of the model group. The positive rate of Bcl-2 protein expression in the head of the pancreas in the treated group was significantly higher than that of the model group at 3 hours. TUNEL staining showed that the pancreas head and tail apoptosis indices of the treated group were markedly higher than those of the model group after 6 hours. CONCLUSIONS: Apoptosis may be a protective response. to pancreatic cell injury. The mechanism of action of dexamethasone in treating SAP may be related to the apoptosis of acinar cells in the pancreas induced by apoptosis-regulating genes such as Bax and Bcl-2. The advantages of tissue microarrays in pathological examination of the pancreas include saving of time and energy, efficiency and highly representative.

Expression of p53, p16 and COX-2 in pancreatic cancer with tissue microarray

BACKGROUND: Pancreatic cancer development and progression is driven by the accumulation of genetic changes. In this study we constructed tissue microarray containing specimens from pancreatic cancer, adjacent non-cancer tissue and normal tissue to survey the expression of p53, p16 and cyclooxyganase-2 (COX-2). METHODS: Tissue microarray containing 337 specimens from different stages of pancreatic cancer, adjacent noncancer tissue and normal tissues was constructed, and the expression of p53, p16 and COX-2 was assayed by immunohistochemistry to consecutive formalin-fixed tissue microarray sections. RESULTS: The expression of p53, p16 and COX-2 was significantly higher in tumorous tissues than in non-tumorons ones. A significant relationship was observed between p53 and COX-2, or p16 and COX-2. But no obvious correlation was seen between p53 and p16 expressions. Logistic regression analysis showed p53 and COX-2 as dependent predictors in pancreatic carcinogenesis, and a reciprocal relationship to neoplastic progression between p53 and COX-2. CONCLUSION: Combination analysis of p53 and COX-2 may be useful in predicting pancreatic carcinogenesis.

EXPRESSION OF SURVIVIN,PTEN AND BFGF IN LUNG CANCER PROGRESSION TISSUE MICROARRAY

To investigate the expressions of survivin, PTEN and bFGF in lung cancer and precancerous lesion by tissue microarray technology. Methods: The expressions of Survivin, PTEN and bFGF were detected in 89 primary lung cancers, 12 lung cancers with lymph node metastasis, 12 precancerous lesions of lung by an immunohistochemical method, and 10 normal lung tissues were used as controls. Results: The expression of Survivin and bFGF protein were 57.3% and 66.3% in 89 primary lung cancer respectively, significantly higher than the control group (P<0.05). The positive ratio of PTEN was 42.7% in primary lung cancer, significantly lower than that of nornmal tissue (90.0%)(P<0.05). The expressions of Survivin and bFGF were significantly related to lymph node metastasis and clinical stages. The expression of PTEN was related to differentiations, lymph node metastasis and clinical stages (P<0.05). There was a negative correlation between expressions of Survivin and PTEN, a positive correlation between expressions of Survivin and bGFG (P<0.01). Conclusion: Survivin, PTEN and bFGF proteins may be related to the pathogenesis, progression and malignant behavious of lung cancer, and there are some relationships between expressions of Survivin, PTEN and bFGF. Survivin, PTEN and bFGF may play a role in prognosis assessment of lung cancer.

Inverse correlation between CD8^+ inflammatory cells and E-cadherin expression in gallbladder cancer:Tissue microarray and imaging analysis

AIM To investigated the association between the tumor cells' expression of E-cadherin and the numbers of several types of inflammatory cells infiltrating into the invasive portion of gallbladder cancer(GBC).METHODS We analyzed 50 GBC cases for which a sufficient amount of tumor tissues for tissue microarray(TMA) had been saved. Three tissue cores(3.0 mm) of invasive lesion from each case were used for the TMA. The 4-μm cut sections on slides were immunostained using primary antibodies including E-cadherin for cancer cells, leukocyte common antigen for leukocyte, myeloperoxidase for neutrophils, CD3 for T cells, CD4 for helper T cells, CD8 for killer T cells, CD20 for B cells and CD68 for macrophages. The immunostained slides were digitally analyzed by imaging analysis software.RESULTS A significant inverse correlation between the number of infiltrating CD8^+ cells at invasive areas and the expression of E-cadherin by cancer cells was observed(P = 0.0001), although the degree of this correlation was relatively weak(R = 0.32). The number of CD8^+ cells and the cancer cells' E-cadherin expression were also significantly correlated with tumor differentiation(welldifferentiated vs poorly differentiated)(P = 0.0467 and P = 0.0294, respectively). Inverse correlation of T-stageand the number of CD8^+ cell infiltration was observed with statistical significance in comparison of T2 and T3 cases(P = 0.0324).CONCLUSION Our findings indicate an inverse correlation of CD8^+ T cell infiltration and cancer cells' E-cadherin expression at invasive areas of GBC. Further analyses are essential to test these findings.

Application of new tissue microarrayer-ZM-1 without recipient paraffin block

The ZM-1 tissue microarrayer designed by our groups is manufactured in stainless steel and brass and contains many features that make TMA (tissue microarray) paraffin blocks construction faster and more convenient. By means of ZM-1 tissue microarrayer, biopsy needles are used to punch the donor tissue specimens respectively. All the needles with the punched specimen cylinders are arrayed into the array-board, with an array of small holes dug to fit the needles. All the specimen cylinders arraying and the TMA paraffin block shaping are finished in only one step so that the specimen cylinders and the paraffin of the TMA block can very easily be incorporated and the recipient paraffin blocks need not be made in advance, and the paraffin used is the same as that for conventional pathology purpose. ZM-1 tissue microarrayer is easy to be manufactured, does not need any precision location system, and so is much cheaper than the currently used instrument. Our method’s relatively cheap and simple ZM-1 tissue microarrayer technique of constructing TMA paraffin block may facilitate popularization of the TMA technology.

ADVANTAGES AND APPLICATIONS OF TISSUE MICROARRAY TECHNOLOGY ON CANCER RESEARCH

S To provide evidences for exploiting tissue microarray (TMA) technology, we reviewed advantages and applications of TMA on tumor research. TMA has many advantages, including (1) section from TMA blocks can be utilized for the simultaneous analysis of up to 1,000 different tumors at DNA, RNA or protein level; (2) TMA is highly representative of their donor tissues; (3) TMA can improve conservation of tissue resources and experimental reagents, improve internal experimental control, and increase sample numbers per experiment, and can be used for large-scale, massively parallel in situ analysis; (4) TMA facilitates rapid translation of molecular discoveries to clinical applications. TMA has been applied to tumor research, such as glioma, breast tumor, lung cancer and so on. The development of novel biochip technologies has opened up new possibilities for the high-throughput molecular profiling of human tumors. Novel molecular markers emerging from high-throughput expression surveys could be analyzed on tumor TMA. It is anticipated that TMA, a new member of biochip, will soon become a widely used tool for all types of tissue-based research. TMA will lead to a significant acceleration of the transition of basic research findings into clinical applications.

COX-2 expression in gastric cancer and its relationship with angiogenesis using tissue microarray

AIM: To explore the expression and clinicopathological significance of cyclooxygenase-2 (COX-2) and microvessel density (MVD) in gastric carcinogenesis, and to investigate their roles in the invasion and the relationship between biological behaviors and prognosis of gastric cancer. METHODS: Using Envision immunohistochemistry, COX-2 and CD34 expressions in gastric cancer tissue array were examined. MVD was counted and the relationship between the biological behaviors and prognosis was analyzed. RESULTS: The expression of COX-2 in gastric cancer tissue was significantly higher than that in normal mucosa (χ2 = 12.191, P < 0.05). The over-expression of COX-2 in gastric cancer was obviously related to metastasis and depth of invasion (χ2 = 6.315, P < 0.05), but not related to the histological type and Borrmann type (χ2 = 5.391 and χ2 = 2.228, respectively). Moreover, MVD in gastric cancer tissues was significantly higher than that in the normal mucosa (65.49 ± 20.64 vs 36.21 ± 18.47, t/F = 7.53, P < 0. 05). MVD was related to the histologic type and metastasis (t/F = 3.68 and t/F = 4.214, respectively, P < 0. 05), but not related to the depth of invasion and Borrmann type (t/F = 0.583 and t/F = 0.459, respectively). MVD in COX-2-positive tissues was markedly higher compared to COX-2-negative tissues, indicating a positive correlation between COX-2 expression and MVD (t = 13.12, P < 0. 05). CONCLUSION: Tissue microarray (TMA) is a powerful tool for rapid identifi cation of the molecular alterations in gastric cancer. COX-2 expression, via inducingangiogenesis, may play an important role in gastric carcinogenesis. It could be served as a determinant factor for clinical prognosis and curative effect.

DETECTING EXPRESSION OF MRP-1/CD9 mRNA IN LUNG CANCERS USING TISSUE MICROARRAYS AND FLUORESCENCE IN SITU HYBRIDIZATION METHODS

Objective： The aim of this study was to investigate the MRP-1/CD9mRNA expression in lung cancer and normal lung tissues and the relationship between its expression and pathologic grades, clinical stages, metastasis and prognosis. Methods： To observe MRP-1/C9mRNA expression, tissue microarray （TMA） containing 54 lung cancers and 10 normal lung tissues was prepared and Fluorescence in situ hybridization was used. Results： The positive rate of MRP-1/CD9 expression was 48.1% in lung cancer, lower than that of normal lung tissues. The statistical difference was significant （P〈0.05）. Its protein expression had no relationship with the patients＇ ages, sex and the macroscopic type of tumor, but had relationships with the histological type, clinical stage, differentiated degree and metastasis. The expression in non-small cell lung cancer （NSCLC） was higher than that in small cell lung cancer （SCLC）; in well-moderately differentiated group was higher than that in poorly differentiated group; Earlier period group （I＋II） was higher than in later period group （Ⅲ＋Ⅳ）; and in group without lymphoid metastasis was higher than in patients with lymphoid metastasis. Conclusion： The progression of the lung cancer maybe related with the descended MRP-1/Cd9 expression, which may be useful in evaluating the prognosis of cancer patients.

EXPRESSION AND SIGNIFICANCE OF SURVIVIN mRNA IN LUNG CANCER TISSUE MICROARRAY DETECTED BY FISH

Objective To investigate the expression of Survivin mRNA in lung cancer tissue microarray (TMA) by fluorescence in situ hybridization (FISH) method, and determine the role and significance of it in lung cancer genesis and progress. Methods The expression of Survivin mRNA was detected by FISH method and TMA technology. Fifty-four cases of lung cancer and 10 cases of normal lung tissue were examined. Results Survivin mRNA was expressed in 66.7% (36/54) of lung cancer; the positive ratio of lung cancer was significantly higher than that of normal lung tissue (0/10; χ2 = 15.238, P < 0.05). The positive ratio of Survivin mRNA was significantly higher in poor differentiated cancer (20/24, 83.3%) than moderate and well differentiated cancer (16/30, 53.3%; χ2 = 5.40, P < 0.05). The positive ratio of Survivin mRNA was significantly higher in group with lymph node metastasis (27/32, 84.4%) than without lymph node metastasis (9/22, 40.9%; χ2 = 11.084, P < 0.05). The positive ratio of Survivin mRNA was significantly higher in stage Ⅲ-Ⅳ(12/13, 92.3%) than stage Ⅰ-Ⅱ (24/41, 58.5%; χ2 = 5.066, P < 0.05). Conclusion Survivin mRNA highly expresses in lung cancer, which is related to the progress and malignant behavior. Survivin may play a promoting role in lung cancer genesis and progress and provide a basis for estimating prognosis and treatment.

Tissue microarray for high-throughput analysis of gene expression profiles in hepatocellular carcinoma

AIM: To study the expression profiles of HBsAg, HBcAg,p21WAF1/CIP1 (p21), Rb genes in hepatocellular carcinoma (HCC) and to investigate their roles in the hepatocarcinogenesis.METHODS: HCC tissue microarray containing 120-min tissues of 40 HCC cases was constructed. HBsAg, HBc Ag,p21 and Rb proteins were immunohistochemically stained by streptavidin-peroxidase conjugated method (S-P). The expression loss of these genes in cancerous, paracancerous tissues and adjacent normal liver tissues of 40HCCs were comparatively examined.RESULTS: The positive rate of HBsAg expression in cancerous tissues of 40 HCCs was 7.5%, which was lower than that in para-cancerous and adjacent normal liver tissues (x2 =12.774, P＜0.01; x2= 18.442, P＜0.01). The positive rate of HBcAg expression in cancerous tissues of 40 HCCs was 20.0%, which was also lower than that in para-cancerous and adjacent normal liver tissues(x2= 9.482, P＜0.01; x2= 14.645, P＜0.01). p21 protein deletion rate in cancerous tissues of 40 HCCs was 27.5%,which was higher than that in para-cancerous and adjacent normal liver tissues (x2 = 7.439, P＜0.01; x2 = 11.174,P＜0.01). p21 protein deletion correlated remarkably with the pathological grade of HCC (x2 = 0.072, P＜0.05). Rb protein deletion rate in cancerous tissues of 40 HCCs was42.5%, which was also higher than that in para-cancerous and adjacent normal liver tissues (x2 = 10.551, P＜0.01;x2= 18.353, P＜0.01). Rb protein deletion rate did not correlate remarkably with tumor size or pathological grade of HCC (x2 = 0.014, P＞0.05; x2 = 0.017, P＞0.05).CONCLUSION: Expression deletion of HBsAg, HBcAg, p21and Rb proteins in HCCs may play important roles in the carcinogenesis of HCC. Tissue microarray is an effective high-throughput technique platform for cancer research.

Significance and expression of Bax, Survivin and p53 in gastric carcinoma and precancerous lesions using tissue microarray

Objective: To explore the relationship between expressions of apoptosis-related protein Bax, Survivin and p53 and the molecular mechanisms of carcinogenesis and progression of gastric carcinoma. Methods: Tissue microarray and immunohistochemistry were used in this study. Results: The positive rate of Bax protein in gastric cancer (17.7%,17/96) was significantly lower than those in adjacent normal mucosa (51%), intestinal metaplasia (69.2%) and dysplasia (75%), P < 0.01. The positive rate of Survivin expression in gastric cancer (80.6%, 89/98) was significantly higher than that in adjacent normal mucosa (3.9%), P < 0.01. The positive rates of Survivin expression in tumors with different organ metastases (in lymph node metastasis 86.2%, liver 100% and ovarian 100%) were statistically higher than in tumors without metastasis (64.3%), P < 0.05. Bax expression was correlated with Survivin but not with mp53 that was closely related to Survivin expression (P < 0.05) in gastric cancer. Conclusion: The abnormal expressions of Bax, Survivin and mp53 were correlated with the tumorigenesis and progression of gastric carcinoma. P53 and Survivin genes may share the similar mechanism in regulating cell apoptosis, and because of the mutation, p53 gene may lower its down-regulation to Survivin expression.

STAT1 and Survivin Expression in Full Lymph Node Examined Gastric Cancer by Using Tissue Microarray Technique

客观：描绘在之间的关系 STAT1 和 Survivinexpression，和在他们和淋巴节点转移之间的关系，在完整的淋巴节点的侵略和预后的深度检查了中国的胃的癌症病人。方法：在 1988 和 2003 之间的药品解剖的标本从 JianghanUniversity 的隶属于的医院被收集。所有 140 个病人有完全的考试数据。所有淋巴结被清除胖方法发现。打断的连续剧染色 andimmunohistochemical 方法的 4 μ m 节，平淡的苏木精和曙红被用来检测淋巴节点转移。胃的癌症 tissuemicroarray 被形成，在胃的癌症的 survivin 和 STAT1 的表示是检测 byimmunohistochemical 方法。所有数据多用枪兵等级相关分析， Kaplan-Meyer 木头等级方法和考克斯被处理变量分析(社会科学统计套装软体 12.0 软件) 。结果：在微数组构造了的 140gastric 癌症织物之中， 110 能被使用(利用率是 78.6%) 。7079lymph 节点在 110 种情况(64.4/case ) 中被发现。转移在 89 种情况和 1679 个淋巴节点中被发现。survivin 和 STAT1 的积极表示率是 52.7%(58/110 ) 并且 40%(44/110 ) 分别地。在 STAT1 表示和 survivinexpression 之间有重要否定关联(r=-0.19， P=0.04 ) 。STAT1 表示与侵略的深度有否定关联(r=-0.21， P=0.04 ) 。Survivin 表示与 UICC N 舞台有否定关联(r=-0.24， P=0.01 ) 并且组织学的分类(r=-0.21， P=0.03 ) 由枪兵等级相关分析。Butsurvivin 和 STAT1 表示没与预后被联系。在淋巴节点转移和预后之间的重要关联被考克斯多表明变量分析(χ ~ 2=4.85， P=0.028 ) 。结论：STAT1 在胃的癌症与 survivin 表示有否定关联。他们俩没在胃的癌症与预后有关联。STAT1 表示能是一个分子的标记预言先进胃的癌症和 survivin 在胃的癌症的淋巴节点转移的一个分子的标记。UICC N 舞台是在在中国的胃的 caner 的最重要的预示的因素。

Expression of Elk-1 in Non-Small Cell Lung Cancer Detected by Western Blot and Tissue Microarray

Objective： The aim of this study was to investigate the Elk-1 （Ets like transcription factor-1） expression in non-small cell lung cancer （NSCLC） and normal lung tissues and the relationship between its expression and clinicopathological characters. Methods： To observe Elk-1 expression, western blot and immunochemistry （IHC） on tissue microarray （TMA） containing 118 lung cancers and their corresponding normal tissues were used. Results： In western blot and IHC on TMA, Elk-1 was highly expressed in NSCLC, while its expression was almost undetectable in normal lung tissues. Elk- 1 expression in NSCLC had no relationship with the patients＇ age, gender, smoking status and histological type, but had relationship with the differentiation degree, clinical stages and lymphonode metastasis. The expression was lower in early stage group （Ⅰ＋Ⅱ） than in advanced stage group （Ⅲ）, and lower in well-moderately differentiated group than in poorly differentiated group. The same trend was seen with lymphonode metastasis. Conclusion： The progression of NSCLC may be related with the increased Elk-1 expression, and Elk-1 may be regarded as a prognostic factor for NSCLC tissues.

Reliability of a Tissue Microarray in Detecting Thyroid Transcription Factor-1 Protein in Lung Carcinomas

OBJECTIVE To compare the expression of the thyroid transcription factor-1 (TTF-1) in human normal adult type II alveolar epithelial cells, embryonic pneumocytes and cancer cells of lung carcinoma and metastatic lymph nodes using a tissue microarray (TMA) along with paired conventional full sections, and to investigate the reliability of tissue microarrays in detecting protein expression in lung carcinoma. METHODS A lung carcinoma TMA including 765 cores was constructed. TTF-1 protein expression in both TMA and paired conventional full sections were detected by the immunohistochemical SP method using a monoclonal antibody to TTF-1. A PU (Positive Unit) of TTF-1 protein was assessed quantitatively by the Leica Q500MC image analysis system with results from the paired conventional full sections as controls. RESULTS There was no signifi cance between TMA and paired conventional full sections in TTF-1 expression in different nuclei of the lung tissue. CONCLUSION TTF-1 protein expression in lung carcinoma detected by TMA was highly concordant with that of paired full sections. TMA is a reliable method in detecting protein expression.

Construction of metastatic spinal cancer tissue microarrays

Objective:To explore the construction of metastatic spinal cancer(MSC) tissue microarrays and validate its value in immunohistochemical study of MSC.Methods:Paraffin-embedded specimens from 71 MSC cases and 6 primary tumor cases were selected as donor blocks and prepared into MSC tissue microarrays by tissue array arrangement,the steps of which included location,punching,sampling,sample seeding,and re-diagnosis by hematoxylin-eosin(HE) as well as MMP-9 and MMP-14 immunohistochemical staining.Results:The MSC tissue microarrays thus constructed were intact and crackless,containing 154 complete and well arranged microarray points.None of the sectioned tissue microarrays was lost,and the results of HE staining was consistent with the primary pathologic diagnoses.Immunohistochemical staining was also good without non-specific or marginal effect.Conclusion:The MSC tissue microarrays have a high value in the immunohistochemical study of MSC.