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Myeloperoxidase-deficient polymorphonuclear leucocytes (VI): Relation to cytogenetic abnormalities in primary
Abstract:
Relations between cytogenetic status, FAB-classification and an abnormal subpopulation of myeloperoxidase (MPO)-deficient polymorphonuclears (PMN) in 45 patients with myelodysplastic syndrome (MDS) are reported. Clonal abnormalities were demonstrated in 85% of the patients, with a lower incidence in the RA+ group (refractory anaemia with ring sideroblasts) compared to the others (p = 0.004). In 12 patients a spontaneous progression in cytogenetic aberrations occurred and in 7 of these (60%) a simultaneous progression in FAB-subtype was seen. The appearance of MPO-deficient PMNs was observed in 6 of these patients (55%). A progression in FAB-subtype was noted in further 4 patients and 2 additional patients developed MPO-deficient PMNs. Only one sufficient cytogenetic investigation was available in these patients. Thus 100% of the fully studied patients showed progression in cytogenetic abnormalities when a progression in FAB-subtype or a development of MPO-deficient PMNs was seen. 3 (49%) of the 8 patients developing MPO-deficient PMNs too showed a progression in FAB-subtype. Although no significant correlation to specific categories of structural aberrations or abnormalities in specific chromosome pairs could be demonstrated, clonal cytogenetic aberrations seem to be involved when the disease progresses and when MPO-deficient PMN develop.
Insights
Cytogenetic abnormalities in myelodysplastic syndromes (MDS) correlate with disease progression and the emergence of myeloperoxidase-deficient neutrophils. These findings highlight the role of clonal aberrations in MDS evolution.
Area of Science:
- Hematology
- Cytogenetics
- Oncology
Background:
- Myelodysplastic syndromes (MDS) are a group of clonal hematopoietic stem cell disorders.
- Cytogenetic abnormalities are common in MDS and are associated with prognosis.
- Myeloperoxidase (MPO)-deficient polymorphonuclears (PMN) represent an abnormal subpopulation that can be observed in MDS.
Purpose of the Study:
- To investigate the relationship between cytogenetic status, French-American-British (FAB) classification, and the presence of MPO-deficient PMN in MDS patients.
- To determine if clonal cytogenetic aberrations are associated with disease progression or the development of MPO-deficient PMN.
Main Methods:
- Analysis of cytogenetic status, FAB classification, and MPO-deficient PMN in 45 MDS patients.
- Monitoring for spontaneous progression in cytogenetic aberrations and FAB subtype.
- Observing the appearance of MPO-deficient PMN.
Main Results:
- Clonal cytogenetic abnormalities were found in 85% of patients, with a lower incidence in the refractory anemia with ring sideroblasts (RA+) group.
- Progression in cytogenetic aberrations was observed in 12 patients, with simultaneous progression in FAB subtype seen in 7 (60%) and appearance of MPO-deficient PMN in 6 (55%).
- 100% of fully studied patients showed progression in cytogenetic abnormalities when FAB subtype or MPO-deficient PMN progression occurred.
Conclusions:
- Clonal cytogenetic aberrations appear to be involved in the progression of MDS and the development of MPO-deficient PMN.
- While no specific correlations were found with particular structural aberrations or chromosome pairs, the presence of clonal abnormalities is a significant indicator.
- The study suggests a link between evolving cytogenetics, FAB classification changes, and the emergence of MPO-deficient PMN in MDS.