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Clonal evolution of an immunoblastic type non-Hodgkin's lymphoma with der(6)t(1;6)(q11;p11) as its primary
S Gagos1, K Iatridou-Kyrkou, A Liosi
1Department of Pathology, Athens School of Medicine, University of Athens, Greece.
Insights
Cytogenetic analysis of non-Hodgkin's lymphoma revealed tetraploid cells with partial trisomy of 1q. This genetic imbalance may drive tumor progression and aggressive behavior in malignant lymphoma.
Area of Science:
- Oncology
- Cytogenetics
- Genetics
Background:
- Non-Hodgkin's lymphoma (NHL) is a diverse group of lymphoid malignancies.
- Recurrent pleural effusions can be a manifestation of advanced lymphoma.
- Understanding the cytogenetic underpinnings of lymphoma progression is crucial for targeted therapies.
Purpose of the Study:
- To investigate the cytogenetic profile of recurrent pleural effusions in a patient with immunoblastic non-Hodgkin's lymphoma.
- To identify chromosomal abnormalities associated with tumor progression and aggressive behavior.
Main Methods:
- Cytogenetic analysis using G-banding was performed on pleural effusion samples.
- Karyotyping was used to identify chromosomal constitutions of lymphoma cells.
- Clonal evolution and specific chromosomal abnormalities were analyzed.
Main Results:
- Two distinct cell populations were identified: a minor pseudodiploid clone and a major tetraploid clone.
- The pseudodiploid clone showed partial trisomy of 1q and monosomy of 6p.
- The tetraploid clone exhibited a complex karyotype with duplicated abnormalities and additional chromosome 9.
Conclusions:
- The high proportion of tetraploid cells suggests favorable selection in the pleural cavity environment.
- Partial trisomy of 1q may be a critical secondary chromosomal abnormality in aggressive NHL.
- This genetic imbalance, possibly predetermined, contributes to tumor progression and aggressive biologic behavior.
Abstract:
Recurrent pleural effusions from a 45-year-old man who was diagnosed as having non-Hodgkin's lymphoma of immunoblastic type were studied cytogenetically. The majority of the metaphases were tetraploid, but there were also lymphoma cells observed with pseudodiploid chromosome constitutions. Cytogenetic analysis by G-banding revealed the existence of at least two cell populations. The karyotype of the minor pseudodiploid clone, which exhibited partial trisomy of 1q11qter and monosomy of 6p11pter as sole abnormalities, was 46,XY,der(6)t(1;6)(q11;p11). The karyotype of the major clone was 92,XXYY,-1,der(6)t(1;6)(q11;p11)x2, +9. The ancestral diploid clone, carrier of the balanced translocation involving chromosomes 1 and 6, was not observed even in the first pleural effusion harvest. The high proportion of tetraploid cells in the recurrent effusions was an indication that these cells were favorably selected in the environment of the somatic cavity. Our cytogenetic findings suggest that partial trisomy of 1q may be a crucial secondary chromosomal abnormality in highly malignant non-Hodgkin's lymphoma. This genetic imbalance was predetermined from the primary abnormality and may be responsible for further tumor progression, as suggested from the clonal evolution in this particular case and, therefore, may be associated with the aggressive biologic behavior of malignant cells.