[Blood culture for diagnosing juvenile chronic myeloid leukemia; relationship to neurofibromatosis]
Insights
Researchers found that analyzing granulocyte-macrophage colony-forming cells (GM-CFC) in blood cultures can help diagnose juvenile chronic myeloid leukemia (CML). This method distinguishes CML from other leukocytosis causes, potentially linking neurofibromatosis to CML.
Area of Science:
- Hematology
- Oncology
- Genetics
Context:
- Juvenile chronic myeloid leukemia (CML) and acute myeloid leukemia (AML) can present with unexplained leukocytosis.
- Distinguishing CML from other myeloproliferative disorders and leukemoid reactions is clinically significant.
- Neurofibromatosis (NF) is a genetic disorder that can occur concurrently with CML.
Purpose:
- To evaluate the diagnostic utility of granulocyte-macrophage colony-forming cell (GM-CFC) analysis in peripheral blood cultures for diagnosing juvenile CML.
- To compare GM-CFC growth in CML patients with normal controls, patients with leukemoid reactions, and other myeloproliferative disorders.
- To investigate the potential role of neurofibromatosis in the aberrant proliferation of GM-CFC in CML.
Summary:
- Peripheral blood GM-CFC cultures from children with CML and AML showed significantly enhanced growth compared to normal donors or patients with other disorders.
- Fibroblast and conditioned medium (CM) from neurofibromatosis-associated CML skin and tumor cultures exhibited enhanced GM-CFC growth-supportive activity.
- These findings highlight the diagnostic value of GM-CFC blood cultures for juvenile CML and suggest a link between NF and enhanced GM-CFC proliferation.
Impact:
- Establishes GM-CFC blood culture analysis as a valuable diagnostic tool for juvenile CML.
- Provides a method to differentiate CML from other conditions causing leukocytosis.
- Suggests a potential pathogenetic link between neurofibromatosis and the hyperproliferation observed in CML.
Abstract:
During the past 12 years we studied children with unexplained chronic leukocytosis and other findings suggestive of acute or chronic myeloid leukemia (AML; CML). We used cultures in soft agar of peripheral blood for granulocyte-macrophage colony-forming cell (GM-CFC) analysis. Colonies were counted, examined morphologically and cytochemically and the findings in patients were compared with those in normal children and patients with leukemoid reactions. 2 children with confirmed CML and neurofibromatosis (NF) were similarly evaluated. Additional studies in 1 of them and in his mother who had NF, included establishment of fibroblast and blood cultures from affected skin and tumor, and stimulation of normal bone marrow-derived GM-CFC by these fibroblasts and the conditioned medium (CM) from these cultures. Growth of GM-CFC from blood cultures of CML and AML patients was significantly enhanced in comparison with blood cultures from normal donors, or patients with other myeloproliferative disorders or leukemoid reactions. Enhanced GM-CFC growth-supportive activity was obtained from CML-NF skin and tumor culture CM in comparison with CM from normal fibroblasts. These results indicate the diagnostic value of blood culture GM-CFC in juvenile CML, and its usefulness in differentiating between CML and other disorders involving leukocytosis. They suggest a possible connection between NF foci and the enhanced proliferation of blood GM-CFC in CML.
