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Phenotypic and functional changes in chronic lymphocytic leukemia

I Răileanu-Moţoiu1, A Dumitrescu

  • 1Clinic of Hematology, Fundeni Hospital, Bucharest, Romania.

Romanian Journal of Internal Medicine = Revue Roumaine De Medecine Interne
|April 1, 1993
PubMed
Summary
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This study on chronic lymphocytic leukemia (CLL) found that B cell function is impaired, particularly in early stages. Immune cell responses decline with disease progression, impacting pathogenesis.

Area of Science:

  • Immunology
  • Hematology
  • Oncology

Background:

  • Chronic lymphocytic leukemia (CLL) is a B-cell malignancy characterized by immune dysregulation.
  • Understanding the functional status of lymphocytic subpopulations is crucial for elucidating CLL pathogenesis.

Purpose of the Study:

  • To investigate the functional competence of lymphocytic subpopulations in patients with chronic lymphocytic leukemia (CLL) at different disease stages.
  • To correlate immune cell function with the clinical course and staging of CLL.

Main Methods:

  • Rosette tests (E4°, E29°, EAC, M) were used to detect lymphocytic subpopulations in 170 CLL patients and 20 controls.
  • In vitro functional assays assessed the response of lymphocytes to mitogens (PHA, PWM) and an antigen (PPD).
  • Patients were staged according to the Rai staging system.

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Main Results:

  • Mean values for lymphocytic subpopulations and their functional responses were significantly reduced in CLL patients compared to controls.
  • Stage 0 CLL patients exhibited significantly lower B-cell parameters (EAC rosetting, PPD, PWM response) compared to other stages, showing values closer to normal.
  • The response of PWM-stimulated T-dependent B cells decreased significantly and gradually with advancing clinical stages of CLL.

Conclusions:

  • Early-stage CLL (Stage 0) shows distinct B-cell functional deficits.
  • The progressive decline in T-dependent B-cell responses correlates with CLL clinical progression.
  • These findings suggest a role for altered lymphocytic subpopulations and their functional impairment in the pathogenesis of chronic lymphocytic leukemia.