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Related Experiment Videos

Morphological and functional polymorphism within clonal thyroid nodules

S Aeschimann1, P A Kopp, E T Kimura

  • 1Laboratories of Experimental Endocrinology, Inselspital, Berne, Switzerland.

The Journal of Clinical Endocrinology and Metabolism
|September 1, 1993
PubMed
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Clonal thyroid nodules are more common than previously thought, often showing heterogeneous growth patterns. Definitive diagnosis requires molecular analysis, not just morphology.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Oncology

Background:

  • Thyroid nodules are common, and understanding their growth patterns is crucial for diagnosis.
  • Classical morphological criteria may not accurately distinguish between benign and potentially neoplastic thyroid growths.

Purpose of the Study:

  • To investigate the clonal origin and histomorphological characteristics of thyroid nodules.
  • To assess the expression of the p21ras growth marker in relation to nodule clonality.
  • To determine if morphological features can reliably identify monoclonal thyroid nodules.

Main Methods:

  • Analysis of 39 surgically removed thyroid nodules using serial histological sections.
  • Immunohistochemical detection of p21ras overexpression.
  • Clonal analysis using the M27 beta probe for X-chromosome polymorphisms (locus DXS255).

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Main Results:

  • Twenty-four nodules were of clonal origin, and 15 were polyclonal.
  • Only 3 of the 24 clonal nodules exhibited uniform histomorphology.
  • Heterogeneity in growth markers (p21ras expression) was observed in most clonal nodules.
  • No distinct morphological features differentiated clonal from polyclonal nodules.

Conclusions:

  • Clonal thyroid nodules are more prevalent than suggested by traditional morphological assessments.
  • Mechanisms generating cellular heterogeneity exist within expanding clonal thyroid nodules.
  • Accurate diagnosis of monoclonal thyroid nodules necessitates molecular or cytogenetic analysis beyond morphological and functional criteria.