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Cells of the Adaptive Immune Response01:23

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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Indolent clonal lymphoid disorders.

Jan Delabie1, Ali Sakhdari1

  • 1University Health Network and University of Toronto, Canada.

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Indolent clonal lymphoid disorders are often incidentally found and do not require lymphoma treatment. Recognizing these conditions is key to avoiding misdiagnosis and unnecessary therapies, though some may progress to lymphoma.

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Area of Science:

  • Hematology
  • Oncology
  • Pathology

Background:

  • Indolent clonal lymphoid disorders are typically asymptomatic and incidentally diagnosed.
  • These conditions are distinct from lymphomas, generally requiring no systemic treatment or extensive follow-up.
  • Accurate diagnosis is crucial to prevent misclassification as lymphoma and avoid unwarranted interventions.

Purpose of the Study:

  • To review B- and T-cell indolent clonal lymphoid disorders.
  • To differentiate these disorders from non-clonal lymphoid lesions and indolent lymphomas.
  • To discuss the evolving terminology and classifications (WHO, ICC) for these conditions.

Main Methods:

  • Review of B- and T-cell indolent clonal lymphoid disorders.
  • Comparison with WHO classification (Fifth Edition) and International Consensus Classification (ICC).
  • Exclusion of non-clonal lesions, plasma cell disorders, and indolent lymphomas requiring follow-up.

Main Results:

  • Indolent clonal lymphoid disorders are generally managed conservatively.
  • Some B-cell disorders can cause significant morbidity via autoimmune phenomena.
  • Certain indolent clonal lymphoid disorders have the potential to progress to lymphoma over time.

Conclusions:

  • Distinguishing indolent clonal lymphoid disorders from lymphomas is critical for appropriate patient management.
  • These disorders offer insights into early-stage lymphomagenesis.
  • Understanding the nuances in classification and potential for progression is essential for clinicians.