Distinct genetic changes characterise multifocality and diverse histological subtypes in papillary thyroid carcinoma.

Abstract:

AIMS:This study was undertaken to investigate the genetic factors underlying the development of multifocality and phenotypic diversity in multifocal papillary thyroid carcinoma (mPTC). METHODS:Loss of heterozygosity (LOH) and BRAF(V600E) mutation status were analysed in a total of 55 individual tumour foci from 18 cases of mPTC. The genetic findings and morphology of tumour foci were then compared. RESULTS:Multifocal PTC LOH rates were higher than observed previously in solitary PTC. Different patterns of LOH and BRAF(V600E) positivity separated follicular variant tumours and tumour foci from other PTC histological subtypes. In five cases, genetic alterations were detected in morphologically normal thyroid epithelium. CONCLUSIONS:These findings support the concept that multifocal PTCs develop through clonal selection from a field of pre-neoplastic cells, with morphotype differentiation correlating with specific tumour-genetic alterations. The relatively high genetic disarray in multifocal PTC may underlie their ability to spread throughout the thyroid gland.

journal_name

Pathology

journal_title

Pathology

authors

Jovanovic L,Delahunt B,McIver B,Eberhardt NL,Bhattacharya A,Lea R,Grebe SK

doi

10.3109/00313025.2010.508780

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

524-33

issue

6

eissn

0031-3025

issn

1465-3931

journal_volume

42

pub_type

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