Concomitant EGFR mutation and EML4-ALK gene fusion in non-small cell lung cancer. Print this page / p- t+ c/ S6 h3 e9 ~
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Sub-category:
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Category:
0 U. o: E5 i6 XTumor Biology
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Meeting:
0 h, B# C0 N3 T2 B1 D9 u) T2011 ASCO Annual Meeting , H' a1 C4 e) z# n. K2 J
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Session Type and Session Title:5 R/ [6 Z7 G0 \! q1 J7 ^1 X3 K9 n- A
Poster Discussion Session, Tumor Biology 9 H/ J( t: W: R
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Abstract No:4 t5 ~3 u0 y# q0 d' }: @! o
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Citation:4 q, p! |6 e/ E7 |& \' V7 G7 T
J Clin Oncol 29: 2011 (suppl; abstr 10517)
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Author(s):4 _% `7 y7 q) T0 w* \: W) q
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.
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Abstract Disclosures
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% o; `: v. |7 i! b# c2 T7 RAbstract:1 i4 o+ K# n' k, d/ A7 ^( M
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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.0 B. B1 O6 o1 U* ^) B4 S! W1 o
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