Concomitant EGFR mutation and EML4-ALK gene fusion in non-small cell lung cancer. Print this page
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Sub-category:% C& c4 g1 R" O
Molecular Targets
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Tumor Biology
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2011 ASCO Annual Meeting & ^8 I" B! K; ~% |* A+ d- ~& w
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Session Type and Session Title:; L" ~( Q9 M& p) |
Poster Discussion Session, Tumor Biology ' z9 k1 n3 {: ]
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( R1 s$ z( t2 T8 ZAbstract No:$ b/ @6 e" E+ }1 Q: V g, F
10517
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J Clin Oncol 29: 2011 (suppl; abstr 10517)
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2 b$ C5 {0 V; t( P0 z iAuthor(s):
: d$ {# V/ _' N" oJ. 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 ( Q% K% L/ k' S0 p7 {
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/ m( G( ^' O3 R5 OAbstracts 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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Abstract Disclosures$ ~, }) [, S# @/ X( i/ ]9 i
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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.- N7 P1 R I9 ]7 E* |% i W1 z
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