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Related Experiment Videos

Desmoid fibromatosis is a clonal process

M Li1, C Cordon-Cardo, W L Gerald

  • 1Department of Pathology, Memorial Sloan-Kettering Cancer Center, New York 10021, USA.

Human Pathology
|September 1, 1996
PubMed
Summary

Desmoid fibromatosis, a soft tissue lesion, is confirmed as neoplastic. Molecular analysis of X chromosome inactivation in female patients revealed clonal origins in most lesions, indicating a true neoplastic nature.

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Area of Science:

  • Oncology
  • Genetics
  • Pathology

Background:

  • Desmoid fibromatosis is a locally aggressive soft tissue proliferation with an uncertain biological nature.
  • Investigating the clonality of desmoid fibromatosis is crucial for understanding its neoplastic potential.

Observation:

  • The study analyzed DNA methylation patterns at the human androgen-receptor gene (HUMARA) locus in 20 desmoid fibromatosis lesions from 11 female patients.
  • X chromosome inactivation patterns were examined to assess clonality.

Findings:

  • Sixteen of twenty lesions (80%) exhibited nonrandom X inactivation, supporting a clonal origin and confirming a neoplastic nature.
  • Recurrent lesions in two patients shared the same X inactivation pattern as primary lesions, indicating derivation from the same clone.
  • Methylation alterations at HpaII sites were observed in some lesions, highlighting the importance of careful molecular analysis and verification with HhaI digestion.

Implications:

  • The findings provide strong evidence for the neoplastic nature of desmoid fibromatosis.
  • Understanding the clonal origin aids in comprehending tumor development and recurrence.
  • The study emphasizes the utility of molecular genetic analysis, specifically X inactivation studies, in diagnosing and characterizing soft tissue lesions.

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