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Hairy cell leukemia cells express CD1a antigen.

G De Panfilis¹, G C Manara, C Ferrari

¹Department of Dermatology, University of Parma, Italy.

|January 1, 1988

Summary

Hairy cell leukemia (HCL) cells exhibit a B-lymphocyte phenotype but unexpectedly express the CD1a antigen, typically found on early thymocytes. This finding suggests a complex lineage ambiguity and may aid in HCL diagnosis.

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Area of Science:

Immunology
Hematology
Oncology

Background:

Hairy cell leukemia (HCL) is a rare B-cell malignancy.
The precise cellular origin and lineage of HCL cells (HCLC) remain incompletely understood.

Purpose of the Study:

To investigate the immunophenotype of HCL cells using a panel of monoclonal antibodies.
To explore the potential lineage ambiguity of HCLC.

Main Methods:

Immunofluorescence staining of peripheral blood leukocytes from five HCL patients.
Analysis of HCLC phenotype using monoclonal antibodies against various cell markers.
Immunoelectron microscopy for confirmation.

Main Results:

HCLC consistently displayed a B-lymphocyte phenotype.

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HCLC did not react with antibodies for monocytes, natural killer cells, or T-cells.

A significant majority of HCLC unexpectedly expressed the CD1a antigen, typically associated with early thymocytes and Langerhans cells.

Conclusions:

HCLC may originate from B-cell lineage precursors that retain early antigens from a different lineage (T-cell).
The expression of CD1a antigen on HCLC expands its known distribution and suggests its utility in HCL diagnosis.