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Related Experiment Videos

Hairy-cell leukemia with T-cell features.

J C Cawley, G F Burns, T A Nash

    Blood
    |January 1, 1978
    PubMed
    Summary
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    This study presents a rare case of hairy cell leukemia (HCL) with unusual T-cell and B-cell markers. Despite these hybrid cell characteristics, the patient exhibited typical clinical and hematological features of HCL.

    Area of Science:

    • Hematology
    • Immunology
    • Oncology

    Background:

    • Hairy cell leukemia (HCL) is a rare chronic lymphoid leukemia.
    • Typical HCL cells express B-cell markers but lack T-cell markers.
    • Unusual immunophenotypic presentations in HCL can complicate diagnosis and understanding.

    Purpose of the Study:

    • To present a unique case of hairy cell leukemia (HCL) with co-expressed T-cell and B-cell markers.
    • To investigate the immunophenotypic characteristics of hairy cells in this specific patient.
    • To determine if these unusual markers correlate with distinct clinical or hematological features.

    Main Methods:

    • Morphological analysis using light and electron microscopy.
    • Immunophenotyping of peripheral blood and splenic mononuclear cells using sheep erythrocyte (E) rosettes and anti-T antiserum.

    Related Experiment Videos

  • Detection of surface and internal immunoglobulins (IgDK, IgMK, IgGK).
  • Assessment of B-cell associated antigens (P29/34 la-like) and mouse rosette formation.
  • Blocking and inhibition studies to elucidate E-rosette formation mechanisms.

    • Main Results:

    • A significant percentage of peripheral blood and splenic mononuclear cells formed spontaneous E-rosettes, identified as hairy cells.
    • A substantial proportion of cells stained positive with anti-T antiserum, which inhibited E-rosette formation.
    • Variable expression of surface and internal immunoglobulins, along with other B-cell markers, was observed.
    • Blocking studies ruled out E-rosette formation due to non-specific immunoglobulin binding.
    • These findings suggest a true hybrid cell HCL with co-existing T-cell and B-cell features.

    Conclusions:

    • The presented case represents a rare instance of hairy cell leukemia with hybrid T-cell and B-cell immunophenotypic characteristics.
    • Despite the unusual marker profile, the patient's clinical presentation and hematological findings were typical for HCL.
    • This case highlights the phenotypic diversity within HCL and the importance of comprehensive immunophenotyping.