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Differences in bone marrow cytogenetic characteristics between treated and untreated myeloma
R E Clark1, A D Geddes, J A Whittaker
1Department of Haematology, University of Wales College of Medicine, Cardiff, U.K.
European Journal of Cancer & Clinical Oncology
|December 1, 1989
Summary
Treatment alters myelomatosis karyotypes, shifting from hyperdiploid to hypodiploid/pseudodiploid abnormalities. Post-treatment abnormal karyotypes correlate with poorer survival in multiple myeloma patients.
Area of Science:
- Hematology
- Cytogenetics
- Oncology
Background:
- Clonal karyotypic abnormalities are common in multiple myeloma at diagnosis.
- Limited data exist on karyotypic changes after treatment for multiple myeloma.
Purpose of the Study:
- To investigate the karyotypic status of bone marrow in multiple myeloma patients before and after chemotherapy.
- To compare cytogenetic characteristics between newly diagnosed and previously treated patients.
Main Methods:
- Bone marrow samples from 17 untreated and 29 treated multiple myeloma patients were analyzed.
- Karyotypes were assessed for clonal abnormalities, ploidy, and chromosomal rearrangements.
Main Results:
- Newly diagnosed patients predominantly showed hyperdiploid clones with specific chromosomal involvement.
- Treated patients exhibited a shift towards hypodiploid or pseudodiploid lines with complex karyotypes.
- Abnormal post-treatment karyotypes were associated with significantly lower survival rates (40% vs. 80% for normal karyotype).
Conclusions:
- Chemotherapy in multiple myeloma is associated with significant changes in karyotypic abnormalities.
- Acquired abnormal karyotypes post-treatment may indicate a poorer prognosis.
- Further research is needed to determine if these changes reflect disease evolution or direct treatment effects.