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C-cell hyperplasia.

S Guyétant1, C Bléchet, J-P Saint-André

  • 1INSERM, U618, Protéases et Vectorisation Pulmonaires, Université François-Rabelais de Tours, France. guyetant@med.univ-tours.fr

Annales D'Endocrinologie
|July 15, 2006
PubMed
Summary

Two types of C-cell hyperplasia (CCH), neoplastic and reactive, are identified. Neoplastic CCH stems from RET protooncogene mutations in MEN 2, progressing to medullary thyroid carcinoma (MTC).

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Area of Science:

  • Endocrinology
  • Oncology
  • Genetics

Background:

  • Advances in calcitonin assays and familial medullary thyroid carcinoma (MTC) natural history studies have refined C-cell hyperplasia (CCH) understanding and classification.
  • CCH physiopathology and its relation to clinical presentation require updated insights.

Purpose of the Study:

  • To update the understanding of C-cell hyperplasia (CCH) physiopathology, distinguishing between neoplastic and reactive types.
  • To clarify the clinical implications and management strategies for different CCH classifications.

Main Methods:

  • Review of routine calcitonin assay programs and recent natural history studies of familial medullary thyroid carcinoma (MTC).
  • Clinical and pathological analysis to differentiate CCH types.
  • Correlation of CCH subtypes with genetic mutations (RET protooncogene) and clinical conditions.

Main Results:

  • Identification of two distinct CCH types: neoplastic CCH (linked to RET mutations and MEN 2, progressing to MTC) and reactive CCH (etiology unclear, premalignant potential undocumented).
  • Neoplastic CCH progression to MTC is mutation-dependent.
  • Many previously associated conditions with reactive CCH may be coincidental, with physiological CCH showing male predominance.

Conclusions:

  • Distinguishing between neoplastic and reactive CCH is crucial for appropriate patient management.
  • Neoplastic CCH may represent an 'in situ-MTC' stage.
  • Further research is needed to clarify the pathogenesis of reactive CCH.

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