Leukemia markers expression of peripheral blood vs bone marrow blasts using flow cytometry

Area of Science:

• Hematology
• Immunology
• Oncology

Background:

• Flow cytometry is crucial in clinical hematology for leukemia characterization.
• Immunotyping aids in identifying leukemia subtypes and prognostic indicators.
• Morphological interpretation can be challenging, making immunotyping valuable.

Purpose of the Study:

• To compare immunophenotypic marker expression in peripheral blood (PB) and bone marrow (BM) samples of acute leukemia patients.
• To evaluate the utility of flow cytometry in diagnosing acute myeloid leukemia (AML) and acute lymphoid leukemia (ALL).
• To determine if PB analysis can obviate the need for BM aspiration.

Main Methods:

• Evaluated 18 AML and 13 ALL patients with ≥30% blasts in PB.
• Collected PB and BM samples for flow cytometry analysis.
• Utilized a panel of monoclonal antibodies targeting various cell lineages and markers (e.g., CD markers, TdT, HLA-DR, CD45).

Main Results:

• Discrepancies in marker expression were observed in the ALL group.
• A strong correlation in marker expression between PB and BM samples was found in AML patients for most tested markers.
• Specifically, CD13, CD14, CD45, and HLA-DR showed positive correlation, while CD3, CD5, CD13, CD14, CD19, CD45, HLA-DR, and TdT showed strong correlation in AML.

Conclusions:

• Targeted gating and appropriate antibody panels are essential for consistent leukemia immunotyping in PB and BM.
• Preliminary findings suggest that PB immunophenotyping may minimize the necessity of bone marrow aspiration for leukemia diagnosis.
• Accurate immunotyping in PB can aid in treatment decisions and prognosis.