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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 39 (2001), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Extranodal mantle cell lymphoma mimicking marginal zone cell lymphoma Aim: We report a case of mantle cell lymphoma masquerading as a marginal zone cell lymphoma. Methods and results: In the initial manifestation in the palatine tonsils, the neoplastic cells were found to grow exclusively within the marginal zones of secondary follicles which showed a preserved mantle zone. The few immunostains performed showed a B-cell phenotype including an immunoglobulin light chain restriction. The extranodal manifestation, the growth pattern, and the immunophenotype led to the diagnosis of an extranodal marginal zone B-cell non-Hodgkin’s lymphoma (NHL). The specimen from the relapse occurring 8 months later exhibited diffuse monomorphous cells co-expressing B-cell antigens and CD5, CD43 and cyclin D1, leading to the diagnosis of mantle cell lymphoma. Re-investigation of the initial biopsy revealed that the neoplastic cells within the marginal zones had a mantle cell lymphoma immunophenotype expressing cyclin D1, the immunoglobulin heavy chains IgD and IgM and partly CD5. Both lesions harboured identical clonal immunoglobulin gene rearrangements proving that they represented different manifestations of the same lymphoma. Conclusion: This case emphasizes the importance of broad immunohistological investigation of B-cell NHLs involving the marginal zone.
    Type of Medium: Electronic Resource
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  • 3
    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 : To clarify the distribution and lineage allocation of T-bet-expressing cells in coeliac disease (CD) and in enteropathy-type T-cell lymphoma (ETTCL). The detection of elevated levels of interferon-gamma, interleukin-18 and the key regulator of Th1 helper immune response T-bet in CD biopsies led to the view that CD is the result of a Th1 response to gluten. It remains unknown whether T-bet is expressed in cryptic and overt ETTCL.Methods : Specimens from 20 patients with CD, five patients with cryptic and 10 patients with overt ETTCL were analysed by immunohistology employing single and double labellings for T-bet and CD4 or CD8 antigens.Results : In CD specimens nearly all intraepithelial CD8 cells and many CD4 cells in the lamina propria expressed T-bet. Cryptic ETTCL showed T-bet expression in the intraepithelial neoplastic cells while T-bet+ CD4 cells in the lamina propria were rare. Overt ETTCL showed T-bet expression in cases with non-anaplastic morphology. In addition, a proportion of bystander T cells expressed T-bet.Conclusions : Morphological evidence proves that while T-bet orchestrates a CD4- and CD8-based Th1 reaction in CD, its expression shifts to the neoplastic intraepithelial compartment of cryptic ETTCL and becomes absent or lost in anaplastic overt ETTCL.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 29 (1996), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The Epstein-Barr virus (EBV) is the best characterized human virus known to infect most people all over the world. In most cases, primary infection with EBV is asymptomatic and the virus persists life-long without causing any disease. The availability of sensitive detection methods, however, has led to the identification of a wide array of EBV-associated disease entities. Although nearly 9000 publications have been written since the first description of this virus in 1964, many questions concerning its function and infection patterns remain unanswered. The direct involvement of EBV in the pathogenesis of a disease has only been established for infectious mononucleosis and lymphoproliferative disorders in the setting of congenital or acquired immunodeficiency. Extensive investigations on the role of EBV infection in the pathogenesis of all other EBV-associated lymphoid and epithelial proliferations have led to the conclusion that EBV is not the primary causative agent but it can promote tumour development. Since the early steps in neoplastic development are difficult to assess, further studies are required to clarify the precise role of EBV infection. Furthermore, the clinical significance of the presence of EBV in neoplasia is largely unknown.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 124 (1991), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The immunophenotype and genotype of atypical cells in skin and lymph node infiltrates were investigated in a patient with lymphomatoid papulosis (LyP) complicated by anaplastic large-cell lymphoma of the lymph nodes. The large atypical cells in both skin and lymph nodes displayed an almost identical immunophenotype, i.e. CD30+ and CD25+ .Southern blot analysis for T-cell receptor β-chain gene rearrangement revealed an identical gene configuration in DNA extracted from skin and lymph node. Our results strongly support the hypothesis that clonal populations of T cells arising in cutaneous LyP lesions may undergo malignant transformation, spread into regional lymph nodes, and give rise to secondary malignant lymphomas, such as anaplastic large-cell lymphoma.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 134 (1996), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary Multíple bíopsíes taken from 76 European human Immunodeficiency virus (HIV)-negative patients with primary cutaneous T-cell lymphoproliferations, including mycosis fungoides (MF), pleomorphic T-cell lymphoma (PMTCL). anaplastic large cell lympboma (ALCLI and lymphomatoid papulosis (LyP) were investigated for the presence of Epstein-Barr virus (EBV) through a combined approach. Polymerase chain reaction (PCR) was employed for EBV-DNA detection, in situ hybridization (ISH) for cellular localization of EBV-encoded nuclear RNAs (EBKR1 and EBER2) and immediate early Bam H-fragment: lower frame (BHLF) RNA. and immunohistology (IH) for the identification of EBV-encoded latent membrane protein 1 (LMP1) and of nuclear antigen (EBNA) 2 expression. EBV-DNA was detectable by PCR in 15 of 76 cases (19·7%). EBER-ISH combined with IH identified a variable, usually very low, number of infected neoplastic cells in only seven of the 15 EBV-ONA-harbouring cases. This discrepancy between the results obtained with PCR and ISH is apparently caused by the low number of the infected cells per tissue section. The PMTCL entity produced the greatest number of positive cases, whilst ALCL and LyP cases were almost constantly devoid of the virus. BHLF transcripts were not detectable in any case, nor did any of the EBER-positive cells show an LMP1 or EBNA2 expression. These data show that primary cutaneous T-cell lymphoproliferations display an infrequent association with a latent EBV infection and that the pathogenic role of the virus in the positive cases remains obscure as the virus frequently infects only a minority of the atypical cells.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 124 (1991), S. 0 
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A 72-year-old male patient from north-eastern Iran developed the typical clinical and histopathological features of mycosis fungoides with lymphadenopathy, but without any other systemic involvement. Human T-cell lymphotropic virus (HTLV-I) antibodies were detected in the patient's serum by two different ELISAs and by Western blot using purified viral particles from MT-2 culture supernatants. Cultured peripheral blood lymphocytes were positive for labelling with anti-HTLV-I serum. Southern blot hybridization of DNA extracted from a skin tumour and from an involved lymph node revealed integrated proviral DNA with identical restriction patterns. This case supports a relationship between mycosis fungoides and HTLV-I and may indicate a new region of endemic HTLV-I infection.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Der Onkologe 3 (1997), S. 488-497 
    ISSN: 1433-0415
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Für die meisten malignen Tumoren des Menschen existieren weltweit akzeptierte einheitliche Klassifikationsschemata. Dies trifft leider nicht für die Non-Hodgkin-Lymphome (NHL) zu. Seit 1966 wurden mehr als 8 verschiedene Klassifikationen vorgeschlagen (Tabelle 1). Davon haben sich die „working formula- tion” (WF) auf den amerikanischen Kontinenten und die Kiel-Klassifikation in Europa durchgesetzt.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Aids ; Primäre Hirnlymphome ; Epstein-Barr Virus ; Immunglobulinschwerketten-Genumlagerung ; Key words AIDS ; Primary malignant lymphoma of the brain ; Epstein-Barr virus ; Ig heavy-chain rearrangements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In this study we present morphological, cytological, immunophenotypical, and molecular genetic features of ten cases of AIDS-related primary brain lymphomas obtained as sterotactic biopsies, autopsy specimens, or cerebrospinal fluid samples. Histologically, a very characteristic perivascular and diffuse lymphomatous spread in the brain parenchyma was observed. By applying a highly sensitive in situ hybridization technique (ISH) using digoxigenin-labeled anti-sense riboprobes, abundant Epstein-Barr virus (EBV)-encoded small nuclear RNAs (EBER) transcripts could be demonstrated in each case studied. A combination of ISH with immunohistochemical staining for latent membrane protein (LMP-1) and EBV nuclear antigen-2 (EBNA-2) showed different patterns of EBV latency with a predominance of the broad spectrum (EBER+/EBNA-2+/LMP-1+). Clonal rearrangements of immunoglobulin heavy chain (IgH) genes were demonstrated in four cases using a sensitive polymerase chain reaction. In one patient the rearrangement pattern suggested biclonal lymphoproliferation. Our observations confirm the implication of the EBV in the etiology of AIDS-related primary malignant lymphomas of the brain. The demonstration of EBV gene products and clonal IgH rearrangements even in small biopsy samples is a useful tool for distinguishing between reactive and neoplastic lymphocytic infiltrates, which are frequently observed in brain and cerebrospinal fluid specimens obtained from AIDS patients.
    Notes: Zusammenfassung In der vorliegenden Untersuchung stellen wir typische morphologische, zytologische, immunphänotypische und molekulargenetische Merkmale von 10 Fällen Aids-assoziierter Hirnlymphome vor, die als stereotaktische Biopsien, Autopsiematerial oder Liquorpunktate vorlagen. Mit einer hochsensitiven In-situ-Hybridisierungstechnik (ISH) unter Verwendung von digoxigeninmarkierten Antisensesonden konnten sehr zahlreiche Epstein-Barr-Virus(EBV-)kodierte kurze nukleäre RNA(EBER)-Transkripte in jedem der untersuchten Fälle dargestellt werden. Eine Kombination der ISH mit immunhistochemischen Färbungen zum Nachweis des latenten Membranproteins (LMP-1) und des EBV-Kernantigens-2 (EBNA-2) zeigte unterschiedliche Muster der EBV-Latenz mit Prädominanz des sog. „breiten Spektrums“ (EBER+/EBNA-2+/LMP-1+). Mit einer sensitiven Polymerasekettenreaktion (PCR) konnten klonale Immunglobulinschwerketten (IgH)-Genumlagerungen in 4 Fällen nachgeweisen werden. Bei einem Patienten war eine biklonale Lymphoproliferation nicht auszuschließen. Unsere Beobachtungen unterstreichen die Bedeutung des EBV bei der Entstehung primärer Aids-assoziierter Hirnlymphome. Der Nachweis von EBV-Genprodukten und die Klonalitätsanalyse mit Hilfe der PCR können einen wichtigen Beitrag zur differentialdiagnostischen Abgrenzung von reaktiven entzündlichen gegenüber neoplastischen lymphoiden Infiltraten leisten, die bei Aids-Patienten häufig im Hirngewebe und Liquor beobachtet werden.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Der Pathologe 21 (2000), S. 178-189 
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Großzelliges B-Zell-Lymphom ; Entitäten ; Subtypen ; Klassifikation ; Key words Large B-cell Lymphoma ; Entities ; Subtypes ; Classification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Large B-cell neoplasms represent one of the most frequent groups of non-Hodgkin-lymphomas (30–40%). They are characterised by an aggressive clinical course. These lymphomas may evolve either de novo or secondary during the course of a less aggressive lymphoma. In addition to primary nodal, a primary extranodal manifestation is rather common. The neoplastic cells, even within one given case, show a broad morphological spectrum. Several findings of the last two decades have revealed that the large B-cell lymphomas represent an inhomogeneous group. This fact has been taken into account by the new WHO classification of malignant lymphomas. There are two groups identified, that of the variants and that of the subtypes. The various variants (centroblastic, immunoblastic, anaplastic, T-cell/histiocyte-rich) correspond to lymphomas without reproducible discriminating criteria lacking characteristic clinical, immunophenotypical and genetic findings. In contrast, the primary mediastinal, the intravascular, the primary effusion and primary central nervous system lymphomas represent distinct disease entities. A number of recently described large cell lymphoma types, i. e. plasmablastic, ALK-positive and primary gastric, are included in the classification, their designation as distinct entities is still under discussion.
    Notes: Zusammenfassung Neoplasien aus großen B-Zellen sind eine der häufigsten Gruppen der Non-Hodgkin-Lymphome (30–40%). Sie sind durch einen aggressiven klinischen Verlauf charakterisiert. Diese Lymphome entstehen de novo (meist) oder sekundär im Verlauf eines weniger aggressiven Lymphoms. Neben einer primär nodale wird auch häufig eine primär extranodalen Manifestation beobachtet. Zytomorphologisch zeigen die neoplastischen Zellen ein breites Spektrum auch innerhalb desselben Lymphoms. Zahlreiche Befunde der letzten 2 Jahrzehnte haben verdeutlicht, dass die großzelligen B-Zell-Lymphome eine inhomogene Gruppe repräsentieren. Dieser Umstand spiegelt sich in der aktuellen WHO-Klassifikation der malignen Lymphome wider. Es werden 2 große Gruppen, die der Varianten und die der Subtypen, unterschieden. Die verschiedenen Varianten (zentroblastisch, immunoblastisch, anaplastisch, T-Zell-/histiozytenreich) entsprechen Lymphomen, deren Unterscheidung nicht genügend reproduzierbar ist und die keine eigenständigen klinischen, immunphänotypischen und genetischen Merkmale aufweisen. Im Gegensatz hierzu sind das primär mediastinale, das intravaskuläre Lymphom, die primären Ergusslymphome und primären Lymphome des zentralen Nervensystems eigenständige Krankheitsentitäten. Bestimmte neu beschriebene Typen der großzelligen B-Zell-Lymphome, u. a. das plasmoblastische, das ALK-positive und das primär im Magen auftretende, sind in die Klassifikation integriert, werden aber noch nicht als Entitäten aufgeführt.
    Type of Medium: Electronic Resource
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