Concomitant EGFR mutation and EML4-ALK gene fusion in non-small cell lung cancer. Print this page ; D7 k6 U% x3 o2 b9 l+ W) m
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Sub-category:! p9 Y2 J9 `3 P! \. Q4 V
Molecular Targets 6 }( t8 E3 o( B
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, @ D& R2 b7 FTumor Biology
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Meeting:. C0 _9 ?) [& X* B
2011 ASCO Annual Meeting
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Poster Discussion Session, Tumor Biology 5 i& h" D. {4 @2 W( K
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- p- M3 ~/ n+ d! N, i# X$ C$ AAbstract No:
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Citation:) b: P8 N% ^3 K9 F- u" _5 r" j
J Clin Oncol 29: 2011 (suppl; abstr 10517)
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Author(s):, b2 [1 r0 G w5 L3 Z% M
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
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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., r# n8 K, Z; ~
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Abstract Disclosures& j* F3 o& o1 B2 o0 } S
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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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