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CD56 expression in benign and malignant thyroid lesions.

S Muthusamy1, S Azhar Sha, S N Abdullah Suhaimi

  • 1Universiti Kebangsaan Malaysia (UKM) Medical Centre, Department of Pathology, Kuala Lumpur, Malaysia. nuris@ppukm.ukm.edu.my.

The Malaysian Journal of Pathology
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Summary
This summary is machine-generated.

CD56 is a useful marker for distinguishing benign thyroid lesions from malignant ones. It is highly expressed in benign conditions like follicular adenomas but significantly lower in papillary thyroid carcinoma.

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Area of Science:

  • Endocrinology
  • Oncology
  • Pathology

Background:

  • Thyroid cancer, the most common endocrine malignancy, often originates from follicular cells.
  • Distinguishing benign follicular adenomas from follicular variant papillary thyroid carcinoma can be diagnostically challenging.
  • Immunohistochemical markers are crucial for accurate thyroid lesion diagnosis.

Purpose of the Study:

  • To evaluate the diagnostic utility of the immunohistochemical marker CD56.
  • To differentiate between benign and malignant thyroid lesions using CD56 expression.
  • To assess CD56's role in distinguishing follicular adenoma from follicular variant papillary thyroid carcinoma.

Main Methods:

  • Retrospective study of 108 thyroid lesions (54 benign, 54 malignant).
  • Analysis of CD56 expression in formalin-fixed, paraffin-embedded tissue blocks.
  • Statistical analysis of CD56 expression in various thyroid tumor types.

Main Results:

  • CD56 was expressed in 96.3% of benign lesions versus 44.4% of malignant lesions (p<0.01).
  • High CD56 expression was observed in follicular adenomas (92.8%) and nodular hyperplasia.
  • Low CD56 expression was noted in papillary thyroid carcinoma (90.3%) and follicular carcinoma.

Conclusions:

  • CD56 demonstrates significant potential as an immunohistochemical marker for thyroid lesion differentiation.
  • CD56 can aid in distinguishing benign follicular lesions from malignant counterparts, particularly follicular variant papillary thyroid carcinoma from follicular adenoma.
  • CD56 expression patterns offer valuable insights for thyroid cancer diagnosis.