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Application of BRAF, NRAS, KRAS mutations as markers for the detection of papillary thyroid cancer from FNAB specimens by pyrosequencing analysis

Authors
 Seo-Jin Park ; Je Young Hannah Sun ; Jong Rak Choi ; Woung Youn Chung ; Eun-Kyung Kim ; Jin Young Kwak ; Kyungran Hong 
Citation
 Clinical Chemistry and Laboratory Medicine, Vol.51(8) : 1673~1680, 2013 
Journal Title
 Clinical Chemistry and Laboratory Medicine 
ISSN
 1434-6621 
Issue Date
2013
Abstract
BACKGROUND: BRAFV600E, the most common BRAF gene mutation, is detected in approximately 50% of sporadic papillary thyroid carcinoma (PTC) and may be associated with triggering tumorigenesis of PTC. The aim of our study was to discover additional mutations to increase the diagnostic performance of molecular tests in screening for thyroid cancer from fine needle aspiration biopsy (FNAB) specimens. METHODS: DNA was extracted from 120 freshly obtained FNAB specimens selected according to cytopathology grades of the Bethesda system. A conventional BRAF V600E test was carried out with real-time PCR, and further mutation screening for BRAF mutations in codons 464, 466, 469, NRAS and KRAS codons 12/13 and 61 was done by pyrosequencing. Histopathology reports were reviewed for those who underwent thyroidectomy (n=83). RESULTS: The real-time PCR method detected 45 BRAF V600E- positive cases whereas pyrosequencing detected 30 cases. Additional BRAF (n=4), NRAS (n=11) and KRAS (n=3) mutations were detected in 17 cases (one overlapping BRAF and NRAS mutation). Among 11 NRAS-mutated cases, eight were confirmed as PTC and one as FVPTC on histopathology reports. Five PTC-confirmed cases with BRAF V600E mutation showed additional mutations, all of which were NRAS mutations. DISCUSSION: Despite the higher sensitivity of real-time PCR for detecting BRAFV600E mutations, pyrosequencing easily detected additional point mutations. NRAS mutations were the most prevalently identified additional mutations and were highly associated with malignancy. In conclusion, our findings demonstrate that additional mutations identified by pyrosequencing may help in the pre-operative process in determining the possibility of malignancy and further studies on the occurrence of simultaneous mutations of BRAF, KRAS and NRAS may be warranted.
URI
http://ir.ymlib.yonsei.ac.kr/handle/22282913/87651
DOI
10.1515/cclm-2012-0375
Appears in Collections:
1. 연구논문 > 1. College of Medicine > Dept. of Radiology
1. 연구논문 > 1. College of Medicine > Dept. of Laboratory Medicine
1. 연구논문 > 1. College of Medicine > Dept. of Surgery
Yonsei Authors
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Link
 http://www.degruyter.com/view/j/cclm.2013.51.issue-8/cclm-2012-0375/cclm-2012-0375.xml
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