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  • 1
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study deals with the investigation of the biological significance of an Epstein–Barr virus (EBV) infection in lymphoepithelioid cell lymphoma. A selection of EBV-detection techniques was applied to 15 cases, including polymerase chain reaction (PCR) for the detection of EBV-DNA, in situ hybridization (ISH) for the cellular localization of EBV-encoded small nuclear (EBER 1 and EBER 2) and immediate-early (BHLF) RNAs, and immunohistology for the detection of EBV-encoded latent membrane protein (LMP) expression. PCR and EBER-ISH produced congruent results in those cases with amplifiable DNA, leading to an EBV presence in 11/15 lymphoepithelioid cell lymphoma cases (73%). EBER-ISH combined with immunohistology localized the virus predominantly in several B immunoblasts and small B lymphocytes in eight of the EBV-positive cases, five of which also contained single infected lymphocytes expressing T-cell characteristic antigens. LMP was detected using immunohistology in only a proportion of immunoblasts in four of these cases. The remaining three EBV-positive lymphoepithelioid cell lymphoma cases contained only single EBER-positive small B lymphocytes without LMP expression. No case contained BHLF-RNA expressing cells. These data imply that, although latently EBV-infected cells are frequently present in lymphoepithelioid cell lymphoma cases, the virus is probably not directly involved in the pathogenesis of this entity.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Histopathology 47 (2005), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Aims : Irradiation-induced sialadenitis is a significant cause of morbidity in head and neck cancer patients receiving radiotherapy. Neither the exact aetiopathology of chronic irradiation-induced sialadenitis nor the mechanisms leading to atrophy of the glandular cells associated with an increase in extracellular matrix are understood. The aim of our study was to determine the phenotype of the inflammatory infiltrate and to study its distribution in the affected submandibular glands.Methods and results : Paraffin-embedded submandibular glands from a homogeneous group of 19 patients with advanced oropharyngeal cancer who received conventional radiotherapy to the primary site and upper neck were analysed. In all patients the radiation dose and field were approximately equal. The submandibular glands were obtained during neck dissection. To characterize the lymphoid infiltrate, all tissue sections were immunostained for T cells (CD3, CD4, CD8), cytotoxic T cells (granzyme B), B cells (CD20), and macrophages (Ki-M1p). A histopathological classification into four grades was established based on the degree of glandular atrophy, fibrosis and lymphocytic infiltration. Phenotypic analysis of submandibular gland sections revealed that the great majority of lymphocytic infiltrates were cytotoxic T cells associated with acinar cell destruction.Conclusions : The significantly elevated frequencies of cytotoxic cells in the submandibular glands of patients with irradiation-induced sialadenitis suggest that cell-mediated immune mechanisms may play a part in the pathogenesis of this disease.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 6 (1999), S. 397-399 
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Der Pathologe 17 (1996), S. 289-295 
    ISSN: 1432-1963
    Keywords: Schlüsselwörter MALT ; Non Hodgkin Lymphom ; Rearrangement ; Hashimoto Thyreoiditis ; Sjögren-Syndrom ; Key words MALT ; Non Hodgkin lymphoma ; Rearrangement ; Hashimoto thyreoiditis ; Sjögren's disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Autoimmune diseases are defined as specific, adapted immune reactions against self-antigens. These antigens were attacked by activated, autoaggressive T-Cells in most cases. However, since introduction of the MALT concept it became clear, that particularly in the autoimmune diseases of the MALT specific subpopulations of B-cells play an important role. In this study, the B-cells in the thyroid gland of 40 patients suffering from Hashimoto's disease and 25 patients with Sjögrens syndrome and enlargement of the salivary glands were immunophenotyped and moleculargenetically investigated. The moleculargenetical investigation included PCR based amplification of immunoglobulin heavy chain CDR III region and the T-cell receptor γ chain (TCR-γ). By immunophenotyping, in the salivary glands monocytoid B-cells could be identified as intraepithelial effector cells in nearly all cases, whereas in the thyroid gland mostly marginal zone cells in the follicle epithelium were observed. In 13 biopsy specimen from salivary gland, clonal rearrangements of TCR-γ, and in 9 cases of patients with Sjögren's syndrome JH rearrangements could be detected. Monoclonal TCR-γ rearrangements were identified in 9/40 patients suffering from autoimmunethyroiditis Hashimoto. In 8/40 thyroid gland biopsies a monoclonal JH-rearrangement could be found. Within 11/25 patients with Sjögren's syndrome and in 23/40 patients with M. Hashimoto polyclonal rearrangements were observed. Within all biopsy specimen of patients with monoclonal rearrangements, lymphoepithelial lesions or lymphoepithelial destructions could be identified immunhistochemically. Additionally, in 2 biopsies from salivary gland and in one specimen from thyroid gland the transition from autoimmune disease into a secondary high grade lymphoma was observed. In 26/40 patients with M. Hashimoto and in 11/25 patients with Sjögren's syndrome the transition in a subsequent low grade B cell lymphoma of MALT-type was found. These results lead to the following conclusions: 1. clonal rearrangements of tumor forming B-cells in both autoimmune diseases investigated can be interpreted as facultative malignant. 2. Intraepithelial B-cells probably are the promotors of the autoimmune process and – in case of clonal evolution and immortalisation – can be regard as causative agent in the development of primary extranodal B-cell lymphoma.
    Notes: Zusammenfassung Mit der Etablierung des MALT-Konzeptes in der Immunologie wurde klar, daß bei den Autoimmunerkrankungen des MALT die B-Zellen eine wichtige Rolle spielen. In dieser Arbeit wurden die bei M. Hashimoto und M. Sjögren vorkommenden intraepithelialen B-Zellen immunphänotypisiert und auf Klonalität der γ-Kette des T-Zell Rezeptors (TZR-γ) und der Immunglobulinschwerkette (JH) untersucht. Immunphänotypisch konnten in den Speicheldrüsen bei Patienten mit Sjögren-Syndrom überwiegend monozytoide B-Zellen und in der Schilddrüse bei Patienten mit Autoimmunthyreoiditis Marginalzonenzellen als Effektorzellen ausgemacht werden. Bei 25 Patienten mit M. Sjögren konnten in 13 Proben klonale Rearrangements für TZR-γ und in 9 Biopsaten monoklonale JH-Rearrangements gefunden werden. Monoklonale TZR-γ Rearrangements konnten 9 von 40 untersuchten Patienten mit Autoimmunthyreoiditis identifiziert werden, 8 Proben zeigten ein monoklonales JH-Rearrangement. Bei 11/25 Pat. mit Sjögren-Syndrom und bei 23/40 Patienten mit M. Hashimoto waren polyklonale Rearrangements zu sehen. Sämtliche Patienten mit klonalen Rearrangements wiesen auch immunhistochemisch lymphoepitheliale Läsionen auf. Bei 26/40 Pat. mit M. Hashimoto und bei 11/25 Patienten mit Sjögren Syndrom konnte bereits der Übergang in ein niedrig malignes MALT-Lymphom diagnostiziert werden. Aus diesen Ergebnissen kann die Schlußfolgerung gezogen werden, daß klonale Rearrangements in den beiden genannten Autoimmunerkrankungen als zumindest fakultativ maligne angesehen werden müssen und daß intraepitheliale B-Zellen wahrscheinlich als Promotoren der Autoimmunerkrankungen und – bei klonaler Evolution und Immortalisierung – der Entwicklung primär extranodaler B-Zell Lymphome anzusehen sind.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0584
    Keywords: EBV ; Hodgkin's disease ; Proliferation Prognosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The role of Epstein-Barr virus (EBV) in the pathogenesis of Hodgkin's disease (HD) has not yet been clarified. Using RNA in situ hybridization (ISH) and immunohistochemistry (IHC), the occurrence of small Epstein-Barr virus encoded RNA (EBER) and latent membrane protein-1 (LMP-1) was studied in 22 tissue samples from 21 patients between 4 and 17 years of age with Hodgkin's disease. EBER was detected in eight of 21 patients (38%) in Hodgkin and Reed-Sternberg cells and reactive lymphocytes irrespective of initial clinical stage and histological subtype, whereas LMP-1, positive in ten of 21 patients (48%), was restricted to neoplastic cells. All cases positive for EBER expressed LMP-1 as well. Additionally, oncoprotein Bcl-2 was identified in nine of 21 patients (43%), indicating, besides immortalization of HD cells by EBV, a further growth advantage due to apoptosis prevention by overexpression of this protein. Proliferation-associated antigens Ki-S1 and Ki-S5 were highly expressed in Hodgkin and Reed-Sternberg cells. CD 30 antigen was found in most cases, using two different antibodies (90% and 80%). The presence of this protein, which belongs to the family of nerve growth factor receptor (NGFR), is related to high expression of Ki-67 protein, detected by Ki-S5. CD 20 antigen was detectable in only three of 21 patients (14%). If we compare results of ISH and IHC with clinical data, the occurrence of EBV genome in children with HD seems to have no adverse effect on the final outcome of these patients.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0584
    Keywords: T-LGL ; Leukemia ; G-CSF
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Severe neutropenia is a common feature in patients with T-large granular lymphocytic (LGL) leukemia. Neutropenia often causes severe infections and septicemia, thus representing a major cause of morbidity and mortality in this disease. We have treated two outpatients with T-LGL leukemia who had severe neutropenia (neutrophils 〈0.2×109/l) successfully with G-CSF (5μg/kg daily, s.c). After 10 days of treatment the neutrophil count was within the normal range and a severe oral infection healed rapidly. We conclude that G-CSF therapy is able to normalize the neutrophil count in T-LGL leukemia within a few days and that it can be used to treat severe infections in these patients even on an outpatient basis.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0584
    Keywords: Key words Chloroma ; Acute myeloblastic leukemia ; Chemotherapy ; Autologous stem cell transplantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Isolated chloromas (granulocytic sarcomas) are rare tumors, most of them progressing to acute myeloblastic leukemia within months. There are still no conclusive treatment strategies for this entity; however, early antileukemic chemotherapy seems to lower the probability of developing systemic disease and prolong survival. We report on a patient with isolated meningeal chloroma, primarily misdiagnosed as a high-grade Non-Hodgkin's lymphoma. Two cycles of antileukemic induction chemotherapy were administered, followed by local irradiation and intensified consolidation therapy with autologous stem cell transplantation. After 20 months, he is still in complete remission.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1569-8041
    Keywords: gastrointestinal lymphoma ; non-Hodgkin's lymphoma ; stomach lymphoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: In October 1992, an ongoing prospective study on primarygastrointestinal (GI) lymphoma was initiated to evaluate histologicalfeatures, sites of involvement, and management. Patients and methods: Until May 1996, 352 patients were enrolled, with 279being evaluable for clinical features (208 patients presented with primarygastric lymphoma). Standardized diagnostic workup included central histologicreview and endoscopic and radiologic evaluation of the complete GI tract.Primary surgery or conservative management depended on the physician'sdecision, followed by radiotherapy with or without chemotherapy. Treatmentoutcome is evaluable in 122 patients with gastric lymphoma. Results: In 279 evaluable patients, the distribution of NHL was asfollows: stomach 74.6%, small bowel 8.6%, ileocoecal region6.5%, multilocal GI involvement 6.8%. In gastric lymphoma,low-grade NHLs accounted for 39%. Of the remaining high-grade NHLs,36.1% showed simultaneous low-grade components, thus being also of MALTorigin. Of 208 patients with gastric NHL, 71.1% were classified asstage I and II1. CCR rate in stomach lymphoma is significantlyhigher compared to those of the small bowel, whereas involvement of multipleGI organs has the worst prognosis. So far only 7 patients with gastric NHL in stages I and IIpresented with progressive disease or relapse. Over all stages there seems tobe no difference in therapeutic outcome in surgically or conservativelytreated patients. Even after R0-resection in limited stages patients appearto have no better outcome. Conclusion: The value of surgery in treatment of primary gastriclymphoma – as favored by most authors – should be reexamined.
    Type of Medium: Electronic Resource
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