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[Does Ph'-negative chronic myeloleukemia exist?].
Gematologiia I Transfuziologiia
|November 1, 1989
Summary
Most patients diagnosed with Philadelphia chromosome-negative chronic myeloleukemia (CML) actually have other myeloproliferative disorders. Genetic analysis reveals that typical CML markers are often masked or absent in these cases.
Area of Science:
- Hematology
- Oncology
- Cytogenetics
Context:
- Chronic Myeloid Leukemia (CML) diagnosis traditionally relies on specific cytogenetic markers.
- Philadelphia chromosome-negative (Ph'-negative) cases present diagnostic challenges.
- Distinguishing Ph'-negative CML from other myeloproliferative neoplasms (MPNs) is crucial for appropriate treatment.
Purpose:
- To analyze clinico-hematologic data in patients with suspected Ph'-negative CML.
- To investigate the cytogenetic and molecular-genetic profiles of these patients.
- To clarify the diagnostic criteria for Ph'-negative CML.
Summary:
- Detailed analysis indicates most patients with unchanged chromosome 22 and "Ph'-negative CML" have alternative MPNs, frequently chronic myelomonocytic leukemia.
- In some CML cases, the Ph' chromosome is masked by translocations.
- The molecular-genetic marker (bcr/c-abl fusion gene) can be detected on various chromosomes even with an unchanged chromosome 22, while typical cytogenetic and molecular changes are absent in rare typical CML cases.
Impact:
- Revises the understanding of Ph'-negative CML diagnosis.
- Highlights the importance of comprehensive genetic analysis beyond standard cytogenetics.
- Suggests a need for further research in this patient cohort to refine diagnostic pathways and therapeutic strategies.