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1996-02-27
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Document 0128
DOCN M9630128
TI Primary central nervous system lymphomas--new pathological developments.
DT 9603
AU Jellinger KA; Paulus W; Ludwig Boltzmann Institute of Clinical
Neurobiology, Laniz; Hospital, Vienna, Austria.
SO J Neurooncol. 1995;24(1):33-6. Unique Identifier : AIDSLINE MED/96131091
AB Primary central nervous system lymphomas (PCNSL) show increased
incidence both in immunocompromised high-risk groups and in the general
population. They are extranodal diffuse non-Hodgkin's lymphomas with a
morphology similar to systemic lymphomas, but differ in their biological
and molecular behaviour. The majority are large B-cell variants of
high-grade malignancy; low-grade subtypes and T-cell lymphomas are rare;
up to 50% remain unclassified according to the New Working Formulation
and updated Kiel classification. Monoclonality of immunoglobulin
receptor gene rearrangement can be diagnostically useful. The
pathogenesis of PCNSL is obscure. Epstein-Barr virus (EBV)
genome/proteins expression in two-thirds of HIV-related PCNSL but only
in 15% of those in immunocompetent patients suggest different EBV
latency stages in both types; human herpesvirus type 6 does not appear
to play a pathogenic role. Comparison of expression patterns of integrin
chains and adhesion molecules are very similar for PCNSL and nodal
lymphomas suggesting that they are not selective mediators of lymphoma
cell homing to the brain. In HIV-negative PCNSL they appear not to be
influenced by EBV. Studies of protooncogenes (bcl-1 and bcl-2 genes)
revealed no rearrangement in PCNSL, suggesting that they are not
involved in the pathogenesis of PCNSL that probably do not differ
cytogenetically from nodal B-cell lymphomas. Since most of the currently
known molecular parameters are probably not the primary pathogenic
events, the molecular genetics and pathogenesis of PCNSL are still to be
elucidated.
DE Cell Adhesion Molecules/PHYSIOLOGY Central Nervous System
Neoplasms/EPIDEMIOLOGY/ETIOLOGY/*PATHOLOGY Human Incidence
Lymphoma/EPIDEMIOLOGY/ETIOLOGY/*PATHOLOGY Proto-Oncogenes Risk Factors
JOURNAL ARTICLE REVIEW REVIEW, TUTORIAL
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).