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Bone marrow involvement in systemic lupus erythematosus.

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Systemic lupus erythematosus (SLE) can affect bone marrow, leading to conditions like fibrosis and aplasia. Early bone marrow examination in SLE patients with cytopenias ensures effective treatment and a good prognosis.

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Area of Science:

  • Hematology
  • Rheumatology
  • Immunology

Background:

  • Systemic lupus erythematosus (SLE) is associated with various hematologic abnormalities.
  • Bone marrow involvement, including fibrosis, pure red cell aplasia, and aplastic anemia, suggests the bone marrow is a target organ in SLE.

Purpose of the Study:

  • To describe the characteristics and outcomes of bone marrow involvement in patients with SLE.
  • To highlight the association between SLE and bone marrow abnormalities, particularly fibrosis.

Main Methods:

  • A nationwide retrospective registry study involving 19 centers.
  • Centralized review of bone marrow aspirations and/or biopsies from 30 SLE patients.
  • Data collection included medical history, SLE manifestations, hematologic disorders, treatments, and outcomes.

Main Results:

  • Bone marrow fibrosis was the most common finding (57%), followed by pure red cell aplasia (27%).
  • Myelodysplastic syndrome, aplastic anemia, and agranulocytosis were also observed.
  • Complete improvement was achieved in 24 patients (80%) after a median follow-up of 27 months, with no reported deaths.

Conclusions:

  • This study represents the largest series of SLE patients with bone marrow involvement, confirming a strong link between SLE and bone marrow fibrosis.
  • Bone marrow examination is recommended for SLE patients presenting with atypical or refractory cytopenias.
  • Early diagnosis and treatment of bone marrow involvement in SLE lead to favorable long-term prognoses.