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Related Experiment Videos

Cold thyroid nodules show a marked increase in proliferation markers.

Knut Krohn1, Ingo Stricker, Peter Emmrich

  • 1III Medical Department, and Interdisciplinary Centre for Clinical Research, University of Leipzig, Leipzig, Germany.

Thyroid : Official Journal of the American Thyroid Association
|August 22, 2003
PubMed
Summary

Thyroid nodules, often found in iodine-deficient areas, show increased cell proliferation. This study found higher levels of proliferation markers (PCNA and Ki-67) in cold thyroid nodules, indicating a common feature of these growths.

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Area of Science:

  • Endocrinology
  • Oncology
  • Pathology

Background:

  • Thyroid follicular adenomas and nodules are common, especially in iodine-deficient regions.
  • These nodules can be hypofunctioning (cold) or hyperfunctioning (hot).
  • Their clonal origin suggests increased cell proliferation is involved.

Purpose of the Study:

  • To investigate if increased cell proliferation is detectable in cold thyroid nodules.
  • To evaluate the expression of proliferation markers PCNA and Ki-67 in cold nodules.

Main Methods:

  • Studied paraffin-embedded tissues from 40 cold thyroid nodules and surrounding normal tissue.
  • Assessed proliferating cell nuclear antigen (PCNA) and Ki-67 (MIB-1 antibody) expression.
  • Calculated the labeling index for nodular and surrounding tissues.

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Main Results:

  • A significant increase in PCNA labeling index was found in 33 out of 40 cold nodules.
  • A significant increase in Ki-67 labeling index was detected in 19 out of 40 cold nodules.
  • Surrounding tissues with lymphocyte infiltration showed higher proliferation marker indices.

Conclusions:

  • Increased thyroid epithelial cell proliferation is a common feature in most cold thyroid nodules.
  • The observed proliferation marker heterogeneity did not correlate with histopathological, molecular, or clinical characteristics.