Specific EGFR mutations predict treatment outcome of stage IIIB/IV patients with chemotherapy-naive non-small-cell lung cancer receiving first-line gefitinib monotherapy Journal Article

  

Authors:	Yang, C. H.; Yu, C. J.; Shih, J. Y.; Chang, Y. C.; Hu, F. C.; Tsai, M. C.; Chen, K. Y.; Lin, Z. Z.; Huang, C. J.; Shun, C. T.; Huang, C. L.; Bean, J.; Cheng, A. L.; Pao, W.; Yang, P. C.
Article Title:	Specific EGFR mutations predict treatment outcome of stage IIIB/IV patients with chemotherapy-naive non-small-cell lung cancer receiving first-line gefitinib monotherapy
Abstract:	Purpose To explore predictive factors for time to treatment failure (TTF) in chemotherapy-naive non-smallcell lung cancer (NSCLC) patients receiving gefitinib treatment. Patients and Methods We designed a phase II study to test gefitinib antitumor efficacy in advanced-stage, chemotherapy-naive NSCLC patients. Patients were treated with gefitinib 250 mg/d. Tumor assessments were performed every 2 months. Responding or stable patients were treated until progression or unacceptable toxicity. All scans were reviewed independently. EGFR exons 18-21 sequence, K-ras exon 2 sequence, and MET gene copy numbers were examined in available samples. Clinical or molecular predictors of TTF were examined by multivariate analysis. Results One hundred six patients were enrolled. Ninety patients had tumor samples for biomarker tests. Overall response rate was 50.9% ( 95% CI, 41.4% to 60.4%). Median TTF was 5.5 months, and median overall survival ( OS) was 22.4 months. The response rate and median TTF of the patients with exon 19 deletion (n = 20) were 95.0% and 8.9 months, for exon 21 L858R mutation ( n = 23) were 73.9% and 9.1 month, and for other types of EGFR mutations ( N = 12) were 16.7% and 2.3 months, respectively. In multivariate analysis, the presence of EGFR deletion exon 19 or L858R EGFR mutations in adenocarcinoma patients predicted longer TTF. High copy number of MET seemed to correlate with shorter TTF in patients with gefitinib-sensitive activating EGFR mutations. Conclusion In this prospective study, EGFR exon 19 deletion or L858R mutations in adenocarcinoma were the best predictors for longer TTF in stage IIIB/IV chemotherapy-naive NSCLC patients receiving first-line gefitinib monotherapy.
Keywords:	survival; erlotinib; amplification; therapy; phase-ii trial; previously treated patients; gene-mutations; growth-factor-receptor; acquired-resistance; never-smokers
Journal Title:	Journal of Clinical Oncology
Volume:	26
Issue:	16
ISSN:	0732-183X
Publisher:	American Society of Clinical Oncology
Date Published:	2008-06-01
Start Page:	2745
End Page:	2753
Language:	English
ACCESSION:	WOS:000256210100024
DOI:	10.1200/jco.2007.15.6695
PROVIDER:	wos
PUBMED:	18509184
Notes:	--- - Article; Proceedings Paper - 12th World Conference on Lung Cancer - SEP 02-06, 2007 - Seoul, SOUTH KOREA - "Source: Wos"

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