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This Article Full Text Full Text (PDF) Correction (v60,p1184) All Versions of this Article: jcp.2006.041251v1 60/8/881    most recent Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Email this link to a friend Similar articles in this journal Similar articles in PubMed Add article to my folders Download to citation manager Request Permissions Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Lee, D. H. Articles by Kim, S. W. Search for Related Content PubMed PubMed Citation Articles by Lee, D. H. Articles by Kim, S. W. Pubmed/NCBI databases Medline Plus Health Information Thyroid Cancer

Epidermal growth factor receptor status in anaplastic thyroid carcinoma

¹ Research Institute and Hospital, National Cancer Center, Goyang, Gyeonggi, Korea
² Department of Pathology, Seoul National University College of Medicine, Seoul, Korea
³ Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea

Correspondence to:
Dr Sun Wook Kim
Research Institute and Hospital, National Cancer Center, Madu-dong 809, Ilsandong-gu, Goyang, Gyeonggi, 410-769, Korea; swkim{at}ncc.re.kr Background: The epidermal growth factor receptor (EGFR) has been reported to be overexpressed in anaplastic thyroid carcinoma (ATC). In vitro studies have shown that EGFR tyrosine kinase inhibitors (TKIs) greatly inhibit cellular growth and induced apoptosis in the ATC cell lines, while somatic mutations in the tyrosine kinase domain or an increased gene copy number are associated with increased sensitivity to TKIs in non-small cell lung cancer.

Aim: To investigate the prevalence of EGFR overexpression, gene amplification and activating mutation in the tyrosine kinase domain in patients with ATC.

Methods: The EGFR gene status and protein expression were investigated by direct DNA sequencing of the hot-spot regions in exons 18, 19 and 21, fluorescence in situ hybridisation (FISH), and immunohistochemistry in tumour tissues from 23 patients with ATC.

Results: On mutational analysis and FISH, neither mutations in the hot-spots nor gene amplification was observed. However, high polysomy was identified in 14/23 (60.9%) patients with ATC. All cases with immunohistochemistry (IHC) positivity (n = 6) had high polysomy, whereas 8/17 (47.1%) cases with IHC negativity had high polysomy (p = 0.048). High polysomy was observed in all 10 cases with giant cell subtype, but in only 4/11 (36.3%) with squamoid and 0/2 with spindle cell sarcomatoid subtype. There was no statistically significant correlation between FISH positivity of ATC tumour and presence of well-differentiated component.

Conclusion: Despite the low incidence of somatic EGFR gene mutation and amplification in the study samples, in view of the fact that high polysomy was often identified by FISH, as well as the current lack of therapeutic options, EGFR TKIs are worth investigating for treating the patients with ATC who have at least giant cell subtype.