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A new skin condition, T-cell papulosis associated with B-cell malignancy (TCP-BCM), is described in patients with B-cell malignancies. This eruption involves T-cell infiltrates and B-cell extravasation, explaining its recurrent nature.

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Area of Science:

  • Dermatology
  • Hematology
  • Oncology

Background:

  • A distinct eruption, termed 'insect bite-like reaction' or 'eosinophilic dermatosis of haematological malignancy,' is associated with B-cell malignancies (BCM).
  • The clinical course, histopathological findings, and pathogenesis of this eruption were previously unclear.

Purpose of the Study:

  • To characterize the clinical and histopathological features of this eruption.
  • To investigate its pathogenesis and association with underlying BCM.

Main Methods:

  • A multicenter retrospective study involving 37 patients with BCM and a specific cutaneous eruption.
  • Review of clinical, histopathological, immunohistochemical, and molecular data.

Main Results:

  • The eruption presented as chronic, recurrent, pruritic papules, papulo-vesicles, and nodules, predominantly on the head and neck.
  • Histopathology revealed a dense dermal T-cell infiltrate with eosinophils and evidence of B-cell clones in skin lesions.
  • Chronic lymphocytic leukemia was the most common associated BCM.

Conclusions:

  • The eruption is proposed to be named 'T-cell papulosis associated with B-cell malignancy' (TCP-BCM).
  • Key features aid in clinical recognition and pathological identification.
  • The pathogenesis may involve B-cell extravasation and a secondary T-cell immune response, explaining the recurrent course.