標題: Characteristics and prevalence of KRAS, BRAF, and PIK3CA mutations in colorectal cancer by high-resolution melting analysis in Taiwanese population
作者: Hsieh, Li-Ling
Er, Tze-Kiong
Chen, Chih-Chieh
Hsieh, Jan-Sing
Chang, Jan-Gowth
Liu, Ta-Chih
生物資訊及系統生物研究所
Institude of Bioinformatics and Systems Biology
關鍵字: Colorectal cancer;KRAS gene;BRAF gene;PIK3CA gene;Direct sequencing;High-resolution melting
公開日期: 9-Oct-2012
摘要: Background: The identification of KRAS, BRAF, and PIK3CA mutations before the administration of anti-epidermal growth factor receptor therapy of colorectal cancer has become important The aim of the present study was to investigate the occurrence of KRAS, BRAF, and PIK3CA mutations in the Taiwanese population with colorectal cancer. This study was undertaken to identify BRAF and PIK3CA mutations in patients with colorectal cancer by high-resolution melting (HRM) analysis. HRM analysis is a new gene scan tool that quickly performs the PCR and identifies sequence alterations without requiring post-PCR treatment Methods: In the present study, DNAs were extracted from 182 cases of formalin-fixed, paraffin-embedded (FFPE) colorectal cancer samples for clinical KRAS mutational analysis by direct sequencing. All the samples were also tested for mutations within BRAF V600E and PIK3CA (exons 9 and 20) by HRM analysis. Results: The results were confirmed by direct sequencing. The frequency of BRAF and PIK3CA mutations is 1.1%, and 7.1%, respectively. Intriguingly, we found that nine patients (4.9%) with the KRAS mutation were coexistent with the PIK3CA mutation. Four patients (22%) without the KRAS mutation were existent with the PIK3CA mutation. Two patients (1.1%) without the KRAS mutation were existent with the BRAF mutation. Conclusions: In the current study, we suppose that HRM analysis is rapid, feasible, and powerful diagnostic tool for the detection of BRAF and PIK3CA mutations in a clinical setting. Additionally, our results indicated the prevalence of KRAS. BRAF, and PIK3C4 mutational status in the Taiwanese population. (C) 2012 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.cca.2012.04.029
http://hdl.handle.net/11536/16808
ISSN: 0009-8981
DOI: 10.1016/j.cca.2012.04.029
期刊: CLINICA CHIMICA ACTA
Volume: 413
Issue: 19-20
起始頁: 1605
結束頁: 1611
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