Concomitant EGFR mutation and EML4-ALK gene fusion in non-small cell lung cancer. Print this page
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Sub-category:4 a1 h1 }1 f+ g9 z, A/ F/ D
Molecular Targets 4 j# _, W9 H$ ~: A4 s! y! Y
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Category:
4 Y. r4 m/ t+ X& NTumor Biology ( h: n* L2 n/ S0 a# N* w8 W
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Meeting:. h% p- K1 M7 Y, A. P
2011 ASCO Annual Meeting
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Session Type and Session Title:
- W' R1 u( U. x* L! _/ C MPoster Discussion Session, Tumor Biology
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" s0 M7 [0 u3 B) `* WAbstract No:# U) ]* s$ T7 m% a+ h2 y* F- e
10517
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J Clin Oncol 29: 2011 (suppl; abstr 10517)
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+ R* H1 @& z" W- R s9 Q0 iAuthor(s):
) s/ i# u* n% a8 m. n$ ~J. Yang, X. Zhang, J. Su, H. Chen, H. Tian, Y. Huang, C. Xu, Y. L. Wu; Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China; Guangdong Lung Cancer Institute, Medical Research Center of Guangdong General Hospital, Guangzhou, China; Guangdong Lung Cancer Institute, Guangzhou, China; Guangdong Lung Cancer Institute, Guangdong General Hospital & Guangdong Academy of Medical Sciences, Guangzhou, China 6 @6 F- F+ W$ e3 Q
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Abstracts that were granted an exception in accordance with ASCO's Conflict of Interest Policy are designated with a caret symbol (^) here and in the printed Proceedings.# }; ^8 M) d+ Z! ]
) e7 S3 P1 J# V& q' W/ o- w; GAbstract Disclosures
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Abstract:4 m- z+ Y: e: s7 W; b3 b# I
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/ O, F9 u% C, L' ^& Q- u' wBackground: The fusion of the anaplastic lymphoma kinase (ALK) with the echinoderm microtubule-associated protein-like 4 (EML4) and epidermal growth factor receptor (EGFR) mutations are considered mutually exclusive. Advanced non-small cell lung cancer (NSCLC) patients with EML4-ALK did not benefit from EGFR tyrosine kinase inhibitors (TKIs). Methods: Multiplex reverse transcriptase-polymerase chain reaction (RT-PCR) followed by sequencing was performed for EML4-ALK fusion status detection. EGFR and KRAS mutations were determined by direct DNA sequencing. Positive results of EML4-ALK fusion were also confirmed by RACE-coupled PCR sequencing. Results: From April 2010 to January 2011, 412 patients (398 with NSCLC; 14 with SCLC) were tested for mutation status of EGFR, KRAS and EML4-ALK respectively. Frequency of EML4-ALK fusion was 10.6% (42/398) in NSCLC patients. No patients with SCLC were found to have positive EML4-ALK fusion. Frequency of concomitant EGFR and EML4-ALK gene mutations was 1.0% (4/398) in NSCLC patients, and their variants of EML4-ALK gene mutations were Variant 1 (3 patients) and Variant 6 (1 patient); being never smokers, all of them were diagnosed with advanced (3 with stage †W and 1 with stage IIIB) adenocarcinoma harbouring wild type KRAS. Two female stage †W patients with double gene mutations (1 with L858R and Variant 1; 1 with exon19 deletion and Variant 6) received first-line gefitinib which is one kind of EGFR TKIs and achieved partial response. Conclusions: Though being rare events, NSCLC patients harbouring concomitant EGFR mutation and EML4-ALK gene fusion are sensitive to first-line EGFR TKIs. Whether they could also benefit from ALK inhibition after failure to EGFR TKIs warranted further investigation.
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