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Systemic Erdheim-Chester disease.

Brendan Craig Dickson¹, Vaijayanti Pethe, Catherine Tse-Shing Chung

¹Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, ON, Canada.

Virchows Archiv : an International Journal of Pathology

|January 12, 2008

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See all related articles

Erdheim-Chester disease, a rare xanthomatosis, is investigated for its neoplastic potential. Analysis of two cases suggests a monoclonal origin, supporting its classification as a neoplastic process.

Area of Science:

Pathology
Oncology
Genetics

Background:

Erdheim-Chester disease (ECD) is a rare non-Langerhans cell histiocytosis with debated etiology, often presenting with systemic involvement.
Conflicting reports exist on whether ECD is a reactive or neoplastic process, necessitating further investigation into its cellular origins and behavior.

Observation:

Two cases of Erdheim-Chester disease were analyzed, including clinical histories, histopathology, and clonality assessment using the HUMARA assay.
Histological examination revealed foamy xanthomatous histiocytes infiltrating viscera, with variable inflammatory cell presence.
Immunohistochemistry showed histiocytes positive for CD68 and CD163, supporting a monocyte/macrophage lineage, and negative for S100 and CD1a.

Findings:

One of the two ECD cases demonstrated monoclonality via the HUMARA assay, indicating a clonal proliferation.

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While the second case's clonality could not be assessed due to DNA degradation, the findings in the first case provide significant evidence.

The expression of CD163 further supports the monocyte/macrophage origin of the histiocytes involved in Erdheim-Chester disease.

Implications:

The confirmation of clonality in Erdheim-Chester disease provides strong evidence supporting its classification as a neoplastic disorder.
These findings contribute to a better understanding of ECD pathogenesis and may influence future diagnostic and therapeutic strategies.
Further research into the genetic underpinnings of ECD is warranted to elucidate specific oncogenic pathways.