title: Primary non-Hodgkin lymphomas of the CNS-proliferation, oncoproteins and Epstein-Barr-virus.
abstract: Primary cerebral lymphomas (PCL's) are rare tumors which, however, occur with increasing frequency. The present study investigated 55 PCL's of B-cell type, 36 in immunocompetent and 19 in AIDS-patients and 6 cases of intravascular lymphomatosis. In immunocompetent patients, proliferative indices as evaluated by PC10 and MIB1 reflected the histologic grade. Low grade tumors had a mean PCNA and MIB-1 count of 19 and 18.8 (SD 14.7 and 13.2), respectively, and high grade neoplasias showed counts of 56.7 and 47.1 (SD 19 and 17.4), respectively. No correlation of both indices with patient survival was found. 21 cases (58.3%) displayed p53-positivity of varying degree and 19 cases (52.7%) harbored bcl-2 positive neoplastic cells. Immunocompetent cases were always negative for Epstein-Barr virus RNA and lmp-1-protein. In AIDS-cases, 13 cases (68.4%) showed up lmp-1 positivity and 15 cases (78.9%) had EBER-RNA. bcl-2 positive cells were detected in 5 cases (26.3%) and all cases were p53-negative. These results are in keeping with a role of EBV in the pathogenesis of primary cerebral lymphomas in AIDS-, but not in immunocompetent patients. None of the cases with intravascular lymphomatosis showed an expression of bcl-2 or p53 oncoproteins or lmp-1 and none had EBER-RNA.
authors.affiliation: Institute of Clinical Neuropathology, Zentralkrankenhaus, Bremen-Ost, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Bergmann
authors.forename: S
authors.initials: S
authors.lastname: Blasius
authors.forename: A
authors.initials: A
authors.lastname: Bankfalvi
authors.forename: W
authors.initials: W
authors.lastname: Mellin
mesh_terms: D000328:Adult; D000368:Aged; D001932:Brain Neoplasms / Q000378:metabolism / Q000473:pathology / Q000821:virology; D002455:Cell Division; D005260:Female; D004854:Herpesvirus 4, Human / Q000302:isolation & purification*; D006801:Humans; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D019394:Ki-67 Antigen; D016483:Lymphoma, AIDS-Related / Q000378:metabolism / Q000473:pathology / Q000821:virology; D008228:Lymphoma, Non-Hodgkin / Q000378:metabolism / Q000473:pathology / Q000821:virology; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000032:analysis*; D009687:Nuclear Proteins / Q000032:analysis; D018809:Proliferating Cell Nuclear Antigen / Q000032:analysis; D011518:Proto-Oncogene Proteins / Q000032:analysis; D019253:Proto-Oncogene Proteins c-bcl-2; D016159:Tumor Suppressor Protein p53 / Q000032:analysis
chemical_list: D019394:Ki-67 Antigen; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D018809:Proliferating Cell Nuclear Antigen; D011518:Proto-Oncogene Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D016159:Tumor Suppressor Protein p53