A Rapid, Sensitive Assay to Detect EGFR Mutation in Small Biopsy Specimens from Lung Cancer  Yasushi Yatabe, Toyoaki Hida, Yoshitsugu Horio, Takayuki.

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Presentation transcript:

A Rapid, Sensitive Assay to Detect EGFR Mutation in Small Biopsy Specimens from Lung Cancer  Yasushi Yatabe, Toyoaki Hida, Yoshitsugu Horio, Takayuki Kosaka, Takashi Takahashi, Tetsuya Mitsudomi  The Journal of Molecular Diagnostics  Volume 8, Issue 3, Pages 335-341 (July 2006) DOI: 10.2353/jmoldx.2006.050104 Copyright © 2006 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

Figure 1 Sensitivity of the new assay. A: The sensitivity of the fragment analysis in the new assay. As few as 5% of tumor cells with the deletion could be detected. In the top of B, a brief explanation of the cycleave technology is displayed. Using this technique, as few as 5% of tumor cells with point mutation at codon 858 could be detected (bottom of B). The Journal of Molecular Diagnostics 2006 8, 335-341DOI: (10.2353/jmoldx.2006.050104) Copyright © 2006 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

Figure 2 A representative result of the new assay. DNA was extracted from a paraffin section of the biopsy followed by simultaneous analysis using cycleave real-time PCR and fragment analysis. The entire procedure was completed within 4 hours. In this case, point mutation at codon 858 was detected, and the patient responded to gefitinib therapy. The Journal of Molecular Diagnostics 2006 8, 335-341DOI: (10.2353/jmoldx.2006.050104) Copyright © 2006 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions

Figure 3 Detection of acquired mutation at codon 790. A: The sensitivity of this cycleave assay for T790M mutation. As few as 5% of tumor cells with T790M mutation could be detected. A representative result of acquired mutation at codon 790 after gefitinib treatment is displayed in B (Table 3, case 2). In contrast to the 15-bp deletion in exon 19 of the EGFR gene in both primary and recurrent tumors, T790M was detected only in the recurrent tumor, suggesting acquired mutation after gefitinib treatment. The result of the cycleave method was more obvious than that with direct sequencing. The Journal of Molecular Diagnostics 2006 8, 335-341DOI: (10.2353/jmoldx.2006.050104) Copyright © 2006 American Society for Investigative Pathology and Association for Molecular Pathology Terms and Conditions