Identifying Leukemia-associated Immunophenotypes in Acute Myeloid Leukemia Patients Using Multiparameter Flow...

Area of Science:

• Hematology
• Immunology
• Oncology

Background:

• Acute myeloid leukemia (AML) is a heterogeneous hematologic malignancy.
• Accurate immunophenotyping is crucial for AML diagnosis and monitoring.
• Leukemia-associated immunophenotypes (LAIPs) can serve as diagnostic and prognostic markers.

Purpose of the Study:

• To identify LAIPs in AML patients at diagnosis using an eight-color multiparameter flow cytometry (MFC) panel.
• To assess alterations in LAIPs in relapsed or refractory AML cases.
• To optimize LAIP selection for enhanced minimal residual disease (MRD) detection.

Main Methods:

• Utilized an eight-color MFC panel with CD45/side scatter log gating.
• Analyzed bone marrow samples from 50 AML patients at diagnosis and relapse/refractory stages.
• Included 20 control bone marrow samples from non-malignant hematological conditions.

Main Results:

• LAIPs were detected in 86% of AML patients.
• Most patients (90.7%) exhibited 2-12 aberrant immunophenotypes.
• Specific combinations (e.g., CD2/CD4/CD56 with CD34 or CD117) yielded strong LAIPs.
• Refractory cases maintained similar LAIPs; one case showed new LAIPs upon relapse.

Conclusions:

• LAIP specificity is more critical than frequency for diagnostic utility.
• Optimized LAIP strategies enhance MFC sensitivity for MRD detection in AML.
• Accurate MRD assessment via MFC is vital for AML prognosis and clinical management.