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Clinical features of diffuse large B-cell lymphoma with polyploidy
Joji Shimono1,2, Hiroaki Miyoshi1, Masao Seto1
1Department of Pathology, Kurume University, School of Medicine, Kurume, Japan.
Pathology International
|November 22, 2016
Summary
Polyploidy, an increase in chromosome sets, is identified in diffuse large B-cell lymphoma (DLBCL). This finding reveals a distinct DLBCL subtype with unique features, potentially guiding personalized treatment strategies.
Area of Science:
- Oncology
- Genetics
- Pathology
Background:
- Polyploidy, the presence of more than two sets of homologous chromosomes, is implicated in various malignant tumors.
- Its role in diffuse large B-cell lymphoma (DLBCL) pathogenesis remained unexplored.
- This study investigates polyploidy in DLBCL for the first time.
Purpose of the Study:
- To investigate the clinicopathological features of polyploid diffuse large B-cell lymphoma (DLBCL).
- To determine the frequency and characteristics of polyploidy in DLBCL cases.
- To assess the clinical implications and potential therapeutic responses in polyploid DLBCL.
Main Methods:
- Review of 16 DLBCL cases with polyploidy, defined by G-band analysis showing near-tetraploid or greater chromosome numbers.
- Analysis of clinicopathological features including cell morphology, immunophenotype (CD5, CD30, EBER, Bcl2), and infiltration patterns.
- Evaluation of treatment response and survival in polyploid DLBCL patients.
Main Results:
- Polyploid DLBCL occurred in 2.9% of cases (16/544), predominantly near-tetraploid.
- Polyploid DLBCL showed increased numbers of huge and multinucleated cells compared to non-polyploid DLBCL.
- Cases exhibited reduced extranodal infiltration and major lymph node involvement; 6 of 7 treated patients responded to chemotherapy.
Conclusions:
- Polyploid DLBCL represents a distinct clinicopathological subtype.
- Understanding these features aids in personalized management strategies for DLBCL patients.
- This research highlights the significance of chromosomal abnormalities in DLBCL.
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