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Query: UMLS:C0079731 (B-cell lymphoma)
 16,671 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Epstein-Barr virus is an important aetiological factor in certain HIV-related syndromes, with its opportunist expression related to the level of host immunodeficiency. In asymptomatic people co-infected with HIV, EBV activity is reflected by increased viral shedding and rises in anti-EBV titres; as immunodeficiency ensues EBV manifests as epithelial hyperproliferation in OHL, and later as B-cell lymphoma in AIDS. The suggested role of EBV as a co-factor in the progression of HIV infection and development of AIDS has not been established, although another herpesvirus, cytomegalovirus, might play such a role. Advances in our understanding of HIV regulation and its interaction with other latent (herpes) viruses should provide important molecular and pharmacological approaches to the clinical management of advanced HIV disease.
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PMID:Acquired immunodeficiency syndrome and Epstein-Barr virus. 196 85

There is a significantly increased incidence of malignant lymphoma in patients with acquired immunodeficiency syndrome (AIDS). The lymphomas are usually of a high grade and of B-cell phenotype. While the frequent presence of reactive monocytoid B lymphocytes in patients with AIDS-related lymphadenopathy has recently been documented in several studies, to our knowledge, there are no reported cases of monocytoid B-cell lymphoma, the neoplastic counterpart of monocytoid B lymphocytes, in patients with AIDS. We now describe a human immunodeficiency virus (HIV)-positive patient with HIV-related lymphadenopathy in whom monocytoid B-cell lymphoma developed during the course of his disease. The morphologic and immunologic features of the lymphoma were characteristic of monocytoid B-cell lymphoma, and the involved lymph node exhibited a reversed CD4/CD8 ratio. Moreover, using the polymerase chain reaction, we were able to demonstrate HIV genome in DNA extracted from the lymph node tissue. To our knowledge, this is the first report of a case of monocytoid B-cell lymphoma occurring in an HIV-positive patient and in which we were able, by using a sensitive molecular biologic technique, to demonstrate HIV sequence in paraffin-embedded, fixed lymph node sections.
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PMID:Monocytoid B-cell lymphoma in a patient with human immunodeficiency virus infection. Demonstration of human immunodeficiency virus sequences in paraffin-embedded lymph node sections by polymerase chain reaction amplification. 225 23

From 1978 to 1985, B-cell lymphoma occurred in five employees of an aluminum reduction plant (expected = 0.2; Poisson distribution). As immunodeficiency is a known risk factor for B-cell lymphoma, we did a pilot study to evaluate immune function in apparently healthy plant workers. Twenty-three volunteers were selected for study from 350 workers, representing a range of experience in the potroom and with exposures to strong magnetic fields and volatilized aromatic hydrocarbons. Potroom workers had significantly higher T8 levels (mean = 1,227) than non-potroom workers (mean = 597) (p less than .05, Wilcoxon rank sums) or established normal values (median = 450). T4 levels were higher for potroom workers (mean = 1,017) than for non-potroom workers (mean = 558) or for established norms (median = 756) (p less than .10, Wilcoxon rank sums). Ten of 20 potroom workers had abnormal T4/T8 ratios (less than 0.91) due to disproportionate elevation of the T8 subpopulation. These data suggest an underlying immune alteration in the aluminum workers studied. Further study is needed to assess the implications of abnormal T-cell subsets in a worker population with high rates of lymphoma.
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PMID:Altered immune status in aluminum reduction plant workers. 237 72

The development of high-grade, malignant B-cell lymphoma is a well-recognized complication of human immunodeficiency virus (HIV) infection. Plasma cell neoplasms, however, have been rarely encountered in HIV-infected people. This study presents the morphologic and immunologic features of an unusual plasma cell tumor occurring in a 31-year-old HIV-antibody-positive male. The malignancy was characterized by widespread dissemination and hypercalcemia at presentation and a clinically aggressive course. Immunoperoxidase staining of tumor tissue obtained from biopsy and at autopsy had positive results for IgM and lambda. In the patient's serum, only an IgG kappa paraprotein was detected, indicating that the tumor was nonsecretory. DNA analysis of autopsy-derived tumor tissues demonstrated clonal rearrangements of the immunoglobulin (Ig) heavy chain gene locus and rearrangements in both kappa and lambda light chain gene loci. Furthermore, DNA hybridization studies revealed the presence of Epstein-Barr virus (EBV) genomes in tumor tissue but not in nontumor tissue from this patient.
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PMID:Plasma cell malignancy in the acquired immune deficiency syndrome. Association with Epstein-Barr virus. 254 9

The IgG and IgA antibody subclass responses to pneumococcal polysaccharide antigens type 6A and 19F were studied after immunization with a 14-valent vaccine (Pneumovax, MSD), in 53 splenectomized patients (11 Hodgkin's disease, 13 nonHodgkin's lymphoma (NHL), 9 immune haemolytic anaemia or idiopathic thrombocytopenia purpura and 20 posttraumatic splenectomized patients) and 18 non-splenectomized controls. The antibodies were mainly restricted to the IgG2 and IgA2 subclasses. NHL patients had lower pre-vaccination values to the studied antigens and lower antibody response to vaccination than the other patient groups in which the antibody responses did not differ from those of controls. 1 vaccinated NHL patient experienced two episodes of pneumococcal septicaemia, both occurring after chemotherapy which abolished the previously normal IgG2 antibody levels to the pneumococcal antigens. It is concluded that the antibody response to 6A and 19F antigens after pneumococcal vaccination is not reduced in splenectomized patients but is impaired in immunodeficiency states associated with B-cell lymphoma and treatment with cytostatic drugs.
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PMID:Type-specific anti-pneumococcal antibody subclass response to vaccination after splenectomy with special reference to lymphoma patients. 261 13

To analyze the pathogenesis of B-cell lymphomas in patients with acquired immunodeficiency syndrome (AIDS), we studied two cell lines, Es I and Es III, established from one such lymphoma for the presence of sequences of the Epstein-Barr virus (EBV) and the human immunodeficiency virus [HIV; lymphadenopathy-associated virus (LAV/HTLV-III)] as well as for the presence of cytogenetic abnormalities and monoclonal rearrangements of immunoglobulin and T-cell receptor genes. Both cell lines expressed the same IgM, kappa phenotype as the original lymphoma. The karyotype of Es I was 46, XY, t(8;14), 2 p+, inv (6p), 17p-, and the cells of Es III had an additional i(7q). Immunoglobulin gene studies demonstrated the identical monoclonal rearrangements in both cell lines. Neither EBV nor HIV sequences were detectable in the malignant B cells at the genomic level, leading to the conclusion that mechanisms other than transformation by EBV or HIV may have contributed to the B-cell lymphoma in this patient and possibly also to the generally increased frequency in patients with AIDS.
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PMID:Establishment of two Epstein-Barr virus negative Burkitt cell lines from a patient with AIDS and B-cell lymphoma. 284 27

Four rhesus monkeys (Macaca mulatta) were inoculated with a homogenate of a cutaneous lepromatous leprosy lesion from a mangabey monkey (Cercocebus atys). One died of B-cell lymphoma, and another died of an immunodeficiency syndrome. Cell suspensions prepared from the tumor and spleen of the monkey with lymphoma induced lymphoma or an immunodeficiency syndrome when inoculated into additional young rhesus monkeys. The immunodeficiency syndrome was similar to simian acquired immunodeficiency syndrome and consisted of opportunistic infections, lymphoid hyperplasia or atrophy, wasting, and syncytial cell formation. Mitogen responses and percentages of T4- and T8-positive lymphocytes were normal until the animals were moribund. Lymphoblastoid cell lines became established in vitro from tumor cell suspensions. These cells were infected with a herpesvirus related to Epstein-Barr virus. In addition, a retrovirus morphologically similar to human T-cell lymphotrophic virus type III (HTLV-III) and simian T-lymphotrophic virus type III (STLV-III) was isolated from one of the lymphoblastoid cell lines (LCL). Type D retroviruses could not be demonstrated in the monkeys in the transmission study; however, a retrovirus similar to that in the LCL was isolated from 4 animals by coculture of peripheral blood lymphocytes with the human cell line H9. These results suggest that this retrovirus, STLV-III/Delta, may be associated with the immunodeficiency syndrome in these macaques and may be of mangabey origin.
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PMID:Transmissible lymphoma and simian acquired immunodeficiency syndrome in rhesus monkeys. 301 95

We have summarized the findings in selected congenital and acquired immunodeficiency disorders that frequently display blood and bone marrow abnormalities. Many other immunodeficiency syndromes were not discussed, as bone marrow abnormalities are infrequently seen in them. Examination of the bone marrow is not usually critical for diagnosing most immunodeficiency disorders. However, it may be diagnostic in the evaluation of fever of unknown origin, to rule out other causes of peripheral cytopenias, and to screen for virus-associated malignancies frequently seen in immune-deficient patients (for example, B cell lymphoma, Kaposi's sarcoma). Examination of the bone marrow is critical in the diagnosis of the virus-associated hemophagocytic syndrome and is often important in evaluating patients with the acquired immunodeficiency syndromes who display hematologic disturbances, such as those being treated with AZT, or those who might have opportunistic infections or malignant neoplasms.
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PMID:Bone marrow findings in immunodeficiency syndromes. 306 23

Initial biopsy specimens from two patients with lymphadenopathy and human immunodeficiency virus antibody-positive serum presented considerable difficulty in making specific histologic and immunologic diagnoses, although subsequent biopsy specimens revealed clear progression to acquired immunodeficiency syndrome (AIDS)-associated lymphomas. The initial biopsy specimens revealed multifocal clusters of large blastic lymphoid cells, with some clusters showing a monoclonal lambda light chain predominance, whereas other clusters showed a kappa predominance, indicating considerable phenotypic ambiguity suggestive of polyclonality. This initial clonal ambiguity was followed within two to three months by overt histologic, phenotypic, and clinical malignant transformation to a diffuse high-grade monoclonal B-cell lymphoma. These data have significant implications for the clonality and pathogenesis of AIDS-associated lymphoproliferative disorders. AIDS-related lymphomas may evolve from an initial multiclonal B-cell expansion similar to that described in other severely immunosuppressed patients (eg, with posttransplantation lymphoma).
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PMID:Clonal ambiguity of human immunodeficiency virus-associated lymphomas. Similarity to posttransplant lymphomas. 325 81

Physicians who think epidemiologically are rare. A method is suggested for detecting their aptitude early in their career when help may be offered to make the most of their special talent. Clusters geographically or in families may provide clues to cancer etiology. Clusters have been systematically thought by mapping cancer mortality in the US and independently in China. Case-control studies have revealed environmental exposure responsible for some of the clusters. Clusters noted by alert clinicians or other astute observers have revealed most of the known environmental causes of human cancers. Genetic influence in carcinogenesis has been identified by studies of peculiar cancer occurrence, such as familial aggregation, multiple primary cancer or the occurrence of cancer with other diseases as, for example, congenital malformations and immunodeficiency disorders. Ethnic differences in cancer occurrence may be revealing. Thus, in Japan there is low frequency of B-cell lymphoma but high frequency of certain autoimmune diseases, as if inherent protection against one predisposes the other. As a rule of thumb, the occurrence of three rare observations is not likely to be due to chance. Examples include ideal carcinoma in three persons with cystic fibrosis of the pancreas who survived to about 30 years of age, and the occurrence in Klinefelter's syndrome of germ cell tumor of the pineal--a neoplasm that has an unusually high frequency in Japan. Finally, the history of discoveries concerning cancer etiology, an aspect of what Comroe has called "research on research", can point the way to new discoveries in the future.
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PMID:Nakahara memorial lecture. Rare events and cancer epidemiology. 333 98


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