Endocrine Pathology

, Volume 13, Issue 4, pp 271–288

Molecular pathobiology of thyroid neoplasms

Authors

    • Department of PathologyYale University School of Medicine, Room EP2-608, Yale New Haven Hospital
Clinical Research

DOI: 10.1385/EP:13:4:271

Cite this article as:
Tallini, G. Endocr Pathol (2002) 13: 271. doi:10.1385/EP:13:4:271

Abstract

Tumors of thyroid follicular cells provide a very interesting model to understand the development of human cancer. It is becoming apparent that distinct molecular events are associated with specific stages in a multistep tumorigenic process with good genotype/phenotype correlation. For instance, mutations of the gsp and thyroid-stimulating hormone receptor genes are associated with benign hyperfunctioning thyroid nodules and adenomas while alterations of other specific genes, such as oncogenic tyrosine kinase alterations (RET/PTC, TRK) in papillary carcinoma and the newly discovered PAX8/peroxisome proliferator-activated receptor γ rearrangement, are distinctive features of cancer. Although activating RAS mutations occur at all stages of thyroid tumorigenesis, evidence is accumulating that they may also play an important role in tumor progression, a role that is well documented for p53. Environmental factors (iodine deficiency, ionizing radiations) have been shown to play a crucial role in promoting the development of thyroid cancer, influencing both its genotypic and phenotypic features. It is possible that the follicular thyroid cell has unique ways to respond to DNA damage. Similarly to leukemia or sarcomas (and unlike most epithelial cancers), numerous specific rearrangements are being discovered in thyroid cancer suggesting preferential activation of DNA repair instead of cell death programs after environmentally induced genetic alterations.

Key Words

Thyroid tumor oncogene tumor suppressor gene chromosomal rearrangement tyrosine kinase papillary thyroid carcinoma follicular carcinoma

Copyright information

© Humana Press Inc. 2002