Concomitant EGFR mutation and EML4-ALK gene fusion in non-small cell lung cancer. Print this page 9 G& G$ n7 [, P. w
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Sub-category:
, R! R8 h4 D, P" a% |4 jMolecular Targets 1 m2 ~8 {& T/ @5 h. j+ J' J
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Category:
! S5 L- f5 F: d* ETumor Biology
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0 [9 W+ \. `, k( F8 b6 {. X, aMeeting:
+ i) X* l" f4 m4 Q0 C2 g# L2011 ASCO Annual Meeting
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# d2 y8 D3 c$ S. U% b. `2 Y! WSession Type and Session Title:, S0 Y0 u6 H( l! n4 U
Poster Discussion Session, Tumor Biology
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Abstract No:
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Citation:
* F, c, X S: RJ Clin Oncol 29: 2011 (suppl; abstr 10517) 5 ]& W2 f2 p& `" o9 u
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4 P: X3 _" |$ B6 K1 {Author(s):
: F/ P8 g2 B1 }! pJ. 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 , B+ ~; E9 R1 X2 d( k
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: ~+ Q9 Y9 y. [* X* S N" ?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.
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& q' v4 `. O% C7 i3 OAbstract: p8 y# T% [- ^$ H, l" d& s: [" Z
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Background: 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.# R' M ~8 U: T3 e; [% _
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