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[Two cases of unclassified chronic myeloproliferative disorders]
A Hirano1, I Takahashi, Y Haruta
1Department of Internal Medicine, Kochi Municipal Central Hospital.
Insights
This study details two cases of unclassified chronic myeloproliferative disorders (UCMPD), highlighting distinct cytogenetic findings and the absence of BCR rearrangement. These cases contribute to understanding UCMPD in relation to other myeloproliferative neoplasms.
Area of Science:
- Hematology
- Oncology
- Genetics
Background:
- Chronic myeloproliferative disorders (CMPD) represent a group of clonal hematopoietic stem cell malignancies.
- Unclassified chronic myeloproliferative disorders (UCMPD) present diagnostic challenges, lacking clear classification criteria.
- Accurate diagnosis is crucial for understanding disease progression and therapeutic strategies in myeloproliferative neoplasms.
Observation:
- Two distinct cases of UCMPD were analyzed using comprehensive hematological, cytogenetic, and DNA analyses.
- Case 1 involved a 63-year-old female with marked leukocytosis, splenomegaly, and subsequent blast crisis.
- Case 2 presented a 48-year-old male with fever, leukocytosis, and specific cytogenetic abnormalities without maturation arrest.
Findings:
- Cytogenetic analysis revealed a 46, XX, i(17q) karyotype in Case 1 and 47, XY, +8 in Case 2.
- Southern blot analysis confirmed the absence of BCR gene rearrangement in both UCMPD cases.
- Neutrophil alkaline phosphatase (NAP) scores were elevated (121) in Case 1 and normal (33) in Case 2.
Implications:
- These findings contribute to the differential diagnosis of UCMPD, particularly in distinguishing from Ph1-negative chronic myeloid leukemia and myelodysplastic syndromes.
- The distinct cytogenetic profiles and lack of BCR rearrangement in these UCMPD cases offer insights into their unique molecular pathogenesis.
- Further research into such cases is essential for refining the classification and understanding the relationship between various CMPDs.
Abstract:
Two cases of unclassified chronic myeloproliferative disorders (UCMPD), diagnosed by hematological, cytogenetic and DNA analyses, are described. Case 1: a 63 year old female was admitted because of leukocytosis (96,800/microliters) and splenomegaly. Hematological examinations revealed an increase of the granulocytes in the peripheral blood and bone marrow. The neutrophil alkaline phosphatase (NAP) score was 121. The patient developed blast crisis after 12 months of the chronic phase. Case 2: a 48 year old male was presented with fever and leukocytosis (20,000/microliters). Hematological examinations revealed an increase of granulocytes in the peripheral blood and bone marrow. The NAP score was 33. Maturation-arrest in granulocytic series and morphological abnormalities of marrow cells were not observed in the two cases. Cytogenetic analysis of bone marrow cells disclosed 46, XX, i (17 q) in case 1 and 47, XY, +8 in case 2. Southern blot analysis using 3' bcr probe and TransProbe-1 showed no bcr rearrangement. These cases are thought to be valuable in order to clarify the relationship between UCMPD and CMPD such as Ph1 negative chronic myelocytic leukemia and myelodysplastic syndromes.