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
Pathologyjournal_title
Pathologyauthors
Jovanovic L,Delahunt B,McIver B,Eberhardt NL,Bhattacharya A,Lea R,Grebe SKdoi
10.3109/00313025.2010.508780subject
Has Abstractpub_date
2010-01-01 00:00:00pages
524-33issue
6eissn
0031-3025issn
1465-3931journal_volume
42pub_type
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