Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0268596 (EMA)
 2,520 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

An operable case of pedunculated localized mesothelioma of the pleura, a 62-year-old male, came to our clinic with chief complaint of chest X-ray abnormal shadow. On suspicion of pleural tumor, resection was performed. The operative findings revealed that the tumor was arising from visceral pleura of S1 + 2 a segment of left upper lobe, and didn't invade into peripheral tissue. The microscopic findings revealed that the tumor was consist of spindle tumor cells and capillary-like lesions, and had high cellularity and many mitosis. The tumor was diagnosed as localized malignant mesothelioma. Immunohistochemical stainings were performed using six monoclonal antibodies, vimentin, CEA, EMA, keratin (AE1, AE3), Leu-M1. Only vimentin reacted with tumor cells.
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PMID:[An operated case of malignant localized mesothelioma of the pleura]. 140 76

In this study, a clinicopathologically and immunophenotypically diverse group of T-cell neoplasms were evaluated by one- and two-color flow cytometry and/or immunohistochemistry for the presence of eight antigens (T10, T9, IL2-R, EMA, HLA-DR, LeuM1, Ki-1, and LeuM5) which are expressed in a hierarchical manner by phytohemagglutinin (PHA)-activated benign T cells. We found that 70 of the 72 T-cell neoplasms (97%) expressed at least one of these eight T-cell activation-associated antigens (T-AAgs) and that the number and type of T-AAgs expressed by the neoplastic T cells varied according to the clinicopathologic category of T-cell neoplasia. All 5 T-cell lymphoblastic malignancies expressed T10 and T9; 2 also expressed LeuM1. Twelve of 14 (86%) T cell chronic lymphocytic leukemias (T-CLL) expressed two to four T-AAgs, most frequently T10 (86%) and HLA-DR (79%). The 26 cutaneous T-cell lymphomas (CTCL) expressed between 2 and 5 T-AAgs, most commonly T9 (92%) and HLA-DR (92%), and least often T10 (12%) and EMA (15%). Twenty-six of 27 (96%) peripheral T-cell lymphomas (PTCL) expressed more than 4 T-AAgs. Each of the T-AAgs were expressed by between 22% (LeuM5) and 85% (T9) of the PTCLs. Some T-AAgs were preferentially expressed by the PTCLs in association with other T-AAgs, such as EMA in association with IL2-R and Ki-1. In addition, LeuM5 was preferentially expressed by CD4- CD8+ T-cell neoplasms. However, only 19 of the 72 (26%) T-cell neoplasms (3/5 lymphoblastic malignancies, 3/14 CLLs, 0/26 CTCLs, 13/27 PTCLs) expressed T-AAg immunophenotypic profiles paralleling those expressed by normal peripheral blood T cells activated in vitro with PHA. These results suggest that T-AAg expression by neoplastic T cells does not often mirror the hierarchical order of expression by activated benign T cells, implying that neoplastic T cells do not usually represent the precise malignant counterpart of activated benign, normal T cells.
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PMID:T-cell activation-associated antigen expression by neoplastic T-cells. 142 41

Cutaneous lymphadenoma (CL) is a recently described neoplasm of unknown histogenesis. Histologically, these tumors typically present as well-circumscribed nodules with scant or no epidermal connections. They are composed of multiple rounded lobules of basaloid cells with some degree of peripheral palisading. These epithelial lobules characteristically show a dense lymphoid infiltrate within them. In cases of CL previously described, there was no obvious adnexal differentiation except for isolated cells showing apparent sebaceous differentiation or hints of follicular differentiation. We report two typical cases of CL that were studied histologically and immunohistochemically. In some of the tumor lobules, there were foci of ductal differentiation, with luminal positivity for CEA and EMA. We postulate that some CL represent a form of immature sweat gland tumor with ductal differentiation.
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PMID:Cutaneous lymphadenoma with ductal differentiation. 147 94

A case of pulmonary adenocarcinoma, which was initially manifested as a gastric submucosal tumor, is presented. Endoscopy showed a submucosal tumor in the fundic region in a 79-year-old Japanese woman. Initial biopsy specimens of the stomach revealed atypical spindle cell proliferation, suggesting primary leiomyosarcoma of the stomach. However, biopsy specimens obtained one year later were diagnosed as malignant lymphoma or malignant histiocytosis of the stomach. Autopsy revealed a large necrotic lesion in the right S8 region with metastases in multiple organs. Microscopy demonstrated well to moderately differentiated adenocarcinoma containing spindle or pleomorphic sarcomatous elements. Metastatic nodules including the gastric tumors all showed sarcomatous elements with no epithelial component. Immunohistochemistry showed positive reactions for keratin, epithelial membrane antigen, and carcinoembryonic antigen in areas of carcinoma, whereas most of the sarcomatous elements revealed no positivity for any of the antibodies used, except for focal keratin and EMA positivity in the primary site. This is a rare case of pulmonary adenocarcinoma with sarcomatous elements discovered as a gastric tumor at initial diagnosis, resulting from metastasis of the sarcomatous element in the submucosa.
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PMID:A case of pulmonary adenocarcinoma with sarcomatous elements initially manifested as a submucosal tumor of the stomach. 150 6

Histological examination of a tumor centered in the body of the pancreas of a 65-year-old Iranian man revealed it to have a substantial component in which osteoclast-like giant cells were set within a stroma of pleomorphic mononuclear cells though other areas were composed of conventional adenocarcinoma. Immunocytochemistry was used to investigate the differentiation of the various component cells of the tumor. The carcinoma cells of the usual type expressed epithelial antigens (EMA and cytokeratin). The giant cells expressed vimentin and showed membrane staining with anti-LCA, in common with examples of cells originating from the mononuclear phagocytic system, including normal osteoclasts. The accompanying stromal cells expressed vimentin only. This implies that the giant cells are likely to have their origin in the bone marrow, whereas the mononuclear stromal cells that separate them may represent tumor cells that have lost their epithelial phenotype. The giant cells are therefore an unusual tissue response to the presence of the carcinoma.
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PMID:Adenocarcinoma of the pancreas with osteoclast-like giant cells: a case report with immunocytochemistry. 151 8

Histological analyses of 16 autopsies of pancreatic carcinoma [9 cases after intra-arterial infusion chemotherapy (IAC), and 7 cases of systemic chemotherapy (SC)] were performed. Histological effects of chemotherapy (Shimosato) were seen in 15 cases, but less than 5 Grade II a. cases of IAC and 4 cases of SC showed Grade IIa, 3 cases of IAC and 3 cases of SC showed Grade I. The ratio of Grade IIa was almost the same in IAC and SC. But histologically, anaplastic change, sarcomatous change and Bizarre cells, immunohistologically positive to anti-EMA and Vimentin antibody, were dominant in IAC. And clinically, serum tumor markers (CEA, CA19-9) were fewer in almost all the cases in IAC. These results may suggest that the anti-tumor effect of IAC was greater than the histological appearance.
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PMID:[Histological evaluation of intra-arterial infusion and systemic chemotherapy of pancreatic carcinomas]. 154 62

Gliosarcomas are mixed tumors with malignant glial and mesenchymal elements. The number of GFAP-positive tumor cells decreases with the increase of sarcomatous components, until whole areas may be GFAP negative. These distinct differentiations may, however, lead to false interpretations in small tissue samples. In this connection, it is of interest that, according to other reports, glial tumors may be positive for different anti-keratin antibodies and this prompted us to undertake a systematic investigation of the immunoreactivity of gliosarcomas using a panel of well-characterized monoclonal antibodies against cytokeratins (KL1, AE 1/3, Lu-5, CK-19, CK MNF 116 and Ma-903). These cases were further studied with the anti-epithelial non-cytokeratin antibodies EMA, HEA 125, Ber-EP4, CEA as well as the melanoma-antibody HMB-45, Leu-M1, GFAP and vimentin. As screening study we examined 20 cerebral metastatic carcinomas, 21 malignant gliomas (including 6 gliosarcomas) and 3 metastatic melanomas with the monoclonal antibodies KL1 and HMB-45. All cerebral metastatic carcinomas and 4/6 gliosarcomas were positive for KL1, whereas all melanomas, 2 metastatic carcinomas and 3 gliosarcomas showed an immunostaining with HMB-45. All gliosarcomas were positive with at least one of the tested anti-cytokeratin antibodies. The gliosarcomas did not show an immunoreaction in any of the cases when CEA, HEA 125, Ber-EP4, EMA or Leu M1 were applied. In our opinion, the monoclonal antibodies HEA 125 and Ber-EP4 could obviously be helpful in differentiating gliosarcomas from metastatic carcinomas.
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PMID:Epithelial and melanoma antigens in gliosarcoma. An immunohistochemical study. 159 90

Most compensations for asbestos-related deaths secondary to cancer center around mesothelioma and bronchogenic carcinoma. The differential diagnosis between mesothelioma and adenocarcinoma is a common and troublesome one, necessitating the correlation between clinical history, radiographic findings, and pathologic examination of tissues and cells. We describe a multimodal approach based on the use of routine and special stains, immunocytochemistry, and electron microscopy for distinguishing between mesothelioma and adenocarcinoma. Once a malignant diagnosis is arrived at by careful pathological examination, the tumor is classified as mesothelioma if mesothelial cells are identified as the constituent cells of the neoplasm. Mesothelial cells are recognized by (1) their main ultrastructural features: slender and elongated microvilli, abundant intermediate filaments, and lacking secretory granules; and (2) their characteristic immunocytochemical reactivity: positivity for cytokeratin, EMA, and vimentin, and negativity for carcinoembryonic antigen (CEA), B72-3, Leu-M1, and other gland-cell markers. A variety of methods have been attempted in an effort to distinguish between reactive and malignant mesothelial cells. In practice, however, such distinction depends more on experience and expertise than in any fool-proof ancillary tests. A number of these tests are discussed along with the illustration of classical and unusual examples of mesothelioma and other pleural tumors.
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PMID:Differential diagnosis between mesothelioma and adenocarcinoma: a multimodal approach based on ultrastructure and immunocytochemistry. 160 55

A 78-year-old man was admitted to our hospital with cough and left anterior chest pain. Chest X-ray examination on admission revealed a tumor shadow in the left upper lobe. Malignant tumor cells were observed on histopathological examination of a specimen obtained by bronchoscopic biopsy. Radiotherapy was performed but was not effective, and the patient died of respiratory failure 4 months after admission. Autopsy revealed a 15 cm diameter tumor with marked local invasion tendency without distant metastasis. Microscopically, the tumor consisted partly of squamous cell carcinomas, and partly of fibrosarcomas, composed of spindle cells and osteo-chondrosarcoma. The tumor was therefore diagnosed as carcinosarcoma. Immunohistochemical examination showed positive keratin and EMA staining only in the squamous cell carcinoma component of the tumor.
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PMID:[A case of carcinosarcoma of the lung]. 162 91

Six cases of primary extranodal lymphomas in big salivary glands, which met criteria of MALT lymphoma, were investigated with the aid of antibodies against Ig, light chains, LCA and EMA, in addition in two cases against Ig heavy chains and with antibodies KL-1 and VCHL-1. All the tumours had centrocytoid morphological features, one of them showed signs of focal blastic transformation into centrocytoid centroblastoma. Tumour cells showed twice plasmacytic and three times plasmacytoid differentiation with intracytoplasmic Ig monoclonality (once IgM/kappa, once IgA/kappa, three times kappa positivity). They were positive in reaction against epimyoepithelial proliferation. A picture of myoepithelial sialoadenitis with partial lymphomatous infiltration prevailed in two cases and a lymphoma picture with remnants of sialoadenitis in three cases. Features of inflammatory process were lacking in a case with blastic transformation. There is a dispute whether features of sialoadenitis belong to the defining criteria of MALT type lymphoma or can disappear during blastic transformation of a low grade malignant lymphoma.
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PMID:[Primary MALT-type malignant lymphomas of the salivary glands]. 162 49


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