Hematogones with light chain restriction: A potential diagnostic pitfall when using flow cytometry analysis to assess...

Area of Science:

• Hematology
• Immunophenotyping
• Flow Cytometry

Background:

• Light-chain restricted hematogones (LCR HGs) can be mistaken for B-cell lymphoma in bone marrow aspirates.
• Misdiagnosis can lead to incorrect staging and treatment of patients.

Purpose of the Study:

• To characterize the immunophenotype of LCR HGs.
• To establish criteria for differentiating LCR HGs from B-cell lymphoma using flow cytometry.

Main Methods:

• Flow cytometry analysis of 24 patients with LCR HGs.
• Detailed immunophenotypic characterization including CD markers and CD45/Side Scatter (SSC) plot analysis.
• Comparison with normal hematogones and B-cell lymphoma cases.

Main Results:

• LCR HGs were consistently positive for CD10, CD19, CD38 (bright), CD43, and CD200.
• CD20 expression varied from dim/negative to positive.
• LCR HGs exhibited a distinct location on the CD45/SSC plot compared to B-cell lymphoma.
• 16.6% of cases had concurrent B-cell lymphoma/myeloma.

Conclusions:

• LCR HGs possess a distinct immunophenotype that allows differentiation from B-cell lymphoma.
• Accurate identification of LCR HGs is crucial to avoid misdiagnosis and inappropriate patient management.
• Flow cytometry is a valuable tool for distinguishing LCR HGs from malignant B-cell infiltrates.