Concomitant EGFR mutation and EML4-ALK gene fusion in non-small cell lung cancer. Print this page 1 s7 g; ^$ [$ ^8 v
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Molecular Targets
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Category:
/ d/ g# n! e9 c" ~Tumor Biology 1 E, w% ]8 S$ T0 d( R8 F
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Meeting:
1 Q* C9 a; n0 E9 l" g2011 ASCO Annual Meeting
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Session Type and Session Title:9 ?4 ^, ?& ~1 S/ U% |: Y- T
Poster Discussion Session, Tumor Biology
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Abstract No:$ i) X! z; @6 } i6 { |- s
10517
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J Clin Oncol 29: 2011 (suppl; abstr 10517) 3 g6 L, l3 I; R. Q0 Z5 I
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9 G; o4 X; l- @ V; [3 {% s$ J2 g% WJ. 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
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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.
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% v3 H, s0 ]0 P! @) S3 G! KAbstract Disclosures+ W3 l. W$ \* m9 g) F1 E' a4 S. W
/ V" ^- c) Q! o5 |' g6 n1 NAbstract:6 R4 u# k3 [/ a; e. ~1 Z, U) u
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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.
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