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[A clinical study on myelodysplastic syndrome. Report of 64 cases]
Abstract:
Systematic clinical and laboratory observations of 64 cases of myelodysplastic syndrome (MDS) were made. The results showed that malignant clone already exists in the bone marrow of patients with MDS. Eighteen cases of them have transformed into AML. The rates of transforming into AML in RAEB, RAEB-T and CMML were markedly higher than that in RA. The courses of MDS which transformed into AML from the various types were different. The transformation in RA was obviously longer than those in RAEB and RAEB-T. Two cases transformed into myelofibrosis. Diagnosis of CMML according to the FAB classification criteria revealed that it has two forms. One shows only increase of mature monocytes and it has no relation with the types of acute leukemia to be transformed. It is considered as a reactive monocytosis. The other form, in addition to increase of mature monocytes, also has increase of a few monoblasts and promonocytes. These are considered as true CMML and usually quickly developed into M4 or M5 which are related with monocytes.
Insights
Myelodysplastic syndromes (MDS) harbor a malignant clone, with higher acute myeloid leukemia (AML) transformation rates in RAEB, RAEB-T, and CMML compared to RA. True CMML rapidly progresses to monocytic AML.
Area of Science:
- Hematology
- Oncology
- Cell Biology
Context:
- Myelodysplastic syndromes (MDS) are clonal hematopoietic stem cell disorders.
- Understanding the natural history and transformation potential of MDS subtypes is crucial for patient management.
- Previous studies have indicated varying prognoses among different MDS classifications.
Purpose:
- To systematically observe and analyze the clinical and laboratory features of 64 myelodysplastic syndrome cases.
- To determine the incidence and patterns of transformation to acute myeloid leukemia (AML) across different MDS subtypes.
- To investigate the distinct characteristics and prognostic implications of chronic myelomonocytic leukemia (CMML) variants.
Summary:
- A study of 64 myelodysplastic syndrome (MDS) patients confirmed the presence of a malignant clone in bone marrow.
- Transformation to acute myeloid leukemia (AML) occurred in 18 cases, with significantly higher rates in RAEB, RAEB-T, and CMML compared to RA.
- RAEB-T and RAEB showed faster AML transformation than RA, while two cases progressed to myelofibrosis. CMML was classified into reactive monocytosis and true CMML, with the latter rapidly developing into M4 or M5 AML.
Impact:
- This research clarifies the distinct transformation pathways and timelines for various MDS subtypes.
- It provides critical insights into the prognostic differences between CMML variants, aiding in more precise diagnosis and treatment strategies.
- The findings contribute to a better understanding of MDS progression and the underlying clonal evolution in hematopoietic malignancies.