De novo nodal diffuse large b-cell lymphoma : Identification of biologic prognostic factors
Author
Source
Journal of the Egyptian National Cancer Institute
Issue
Vol. 17, Issue 1 (31 Mar. 2005), pp.20-28, 9 p.
Publisher
Cairo University National Cancer Institute
Publication Date
2005-03-31
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Topics
Abstract EN
Background : Diffuse large B-cell Lymphoma (DLBCL) represents the most frequent type of non-Hodgkin lymphoma (NHL).
Although combination chemotherapy has improved the outcome, long-term cure is now possible for approximately 50 % of all patients, making the search for parameters identifying patients at high risk particularly needed.
The presence of bcl-2 gene rearrangement in de novo DLBCL suggests a possible follicle center cell origin and perhaps a distinct clinical behavior.
This study investigated the frequency and prognostic significance of t (14 ; 18) translocation and bcl-2 protein overexpression in a cohort of patients with de novo nodal DLBCL who where uniformly evaluated and treated.
Material and Methods :A total of 40 patients with de novo nodal DLBCL treated at National Cancer Institute (NCI), Cairo University were investigated.
Formalin– fixed, paraffin-embedded sections were analyzed for : 1) bcl-2 gene rearrangement including major break point region (mbr) and minor cluster region (mcr) by polymerase chain reaction (PCR), and 2) bcl-2 protein expression by immunohistochemistry using Dako 124 clone.
Results were correlated with the clinical features and subsequent clinical course.
Results : Bcl-2 gene rearrangement was detected in 8 cases (20 %), 2 cases at mbr, and 6 cases at mcr.
Bcl-2 protein (> 10 %) was expressed in 24 cases (60 %), irrespective of the presence of t(14 ; 18) translocation.
The t (14 ; 18), and bcl-2 protein overexpression were more frequently associated with failure to achieve a complete response to therapy (p = 0.008, and 0.04, respectively).
DLBCL patients with t(14 ; 18), and bcl-2 protein expression had a significantly reduced 5-year disease free survival (p = 0.04, and 0.01, respectively).
Conclusion : The t (14 ; 18) translocation, and bcl-2 protein expression define a group of DLBCL patients with a poor prognosis, and could be used to tailor treatment, and to identify candidates for therapeutic approaches.
Geographic differences in t(14 ; 18) may be related to the difference in distribution of bcl-2 breakpoints.
American Psychological Association (APA)
Abd al-Hamid, Amani. 2005. De novo nodal diffuse large b-cell lymphoma : Identification of biologic prognostic factors. Journal of the Egyptian National Cancer Institute،Vol. 17, no. 1, pp.20-28.
https://search.emarefa.net/detail/BIM-29647
Modern Language Association (MLA)
Abd al-Hamid, Amani. De novo nodal diffuse large b-cell lymphoma : Identification of biologic prognostic factors. Journal of the Egyptian National Cancer Institute Vol. 17, no. 1 (Mar. 2005), pp.20-28.
https://search.emarefa.net/detail/BIM-29647
American Medical Association (AMA)
Abd al-Hamid, Amani. De novo nodal diffuse large b-cell lymphoma : Identification of biologic prognostic factors. Journal of the Egyptian National Cancer Institute. 2005. Vol. 17, no. 1, pp.20-28.
https://search.emarefa.net/detail/BIM-29647
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 26-28
Record ID
BIM-29647