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Molecular Characterization of Diffuse Large B-cell Lymphoma and Aspects of Transformation
Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology, Oncology.
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Lymphomas are a heterogeneous group of neoplasias originating from B- or T-lymphocytes. In this thesis, we determined the genetic and immunophenotypic characterization of DLBCL and their prognostic impact. Moreover, genomic alterations associated with the transformation to DLBCL from Hodgkin lymphoma (HL) and follicular lymphoma (FL) were elucidated.

In order to outline the impact of cytogenetic as well as immunophenotypic prognostic markers in DLBCL, we firstly studied a series of 54 DLBCL tumors using comparative genomic hybridization (CGH) and we identified several frequently occurring chromosomal imbalances. Loss of 22q was more often found in the diagnostic tumors with a more advanced clinical stage, while gain of 18q21 was more commonly identified in relapses. Secondly, we correlated the expression patterns of CD10, bcl-6, IRF-4 and bcl-2 with clinical parameters in a series of 173 de novo DLBCL patients. Patients with a germinal center (GC) phenotype displayed a better survival than the non-GC group. Expression of bcl-6 and CD10 was correlated with a better survival while bcl-2 expression was associated with a poor prognosis.

In approaching the HL transformation, two novel B-cell lines (U-2932 and U-2940), derived from patients with DLBCL following HL, were characterized. Interestingly, a translocation with materials from 2q and 7q as well as loss of material on 6q was found in both cell lines. For FL transformation, we assessed chromosomal alterations in a panel of 28 DLBCL patients with a previous history of FL. The DLBCL tumors displayed more chromosomal imbalances compared to FL tumors. Loss of 6q16-21 and gain of 7pter-q22 were more commonly found in the DLBCL counterparts, suggesting the chromosomal location of putative genes that may be involved in the transformation process.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2004. , p. 73
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 0282-7476 ; 1353
Keywords [en]
Oncology, Diffuse large B-cell lymphoma, Hodgkin lymphoma, follicular lymphoma, transformation, comparative genomic hybridization, prognosis
Keywords [sv]
Onkologi
National Category
Cancer and Oncology
Identifiers
URN: urn:nbn:se:uu:diva-4266ISBN: 91-554-5970-6 (print)OAI: oai:DiVA.org:uu-4266DiVA, id: diva2:164614
Public defence
2004-05-18, Rudbecksalen, Rudbecklaboratoriet C11, Dag hammarskjölds väg 20, Uppsala, 13:15
Opponent
Supervisors
Available from: 2004-04-23 Created: 2004-04-23Bibliographically approved

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CiteExportLink to record
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Citation style
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