• Noriaki Sunaga, Yoshio Tomizawa, Noriko Yanagitani, Hironobu Iijima, Kyoichi Kaira, Kimihiro Shimizu, Shigebumi Tanaka, Tatsuo Suga, Takeshi Hisada, Tamotsu Ishizuka, Ryusei Saito, Kunio Dobashi, and Masatomo Mori.
• Department of Medicine and Molecular Science, Gunma University Graduate School of Medicine, and Department of Respiratory Medicine, National Nishigunma Hospital, Japan. nsunaga@showa.gunma-u.ac.jp
• Lung Cancer. 2007 Jun 1; 56 (3): 383-9.

PurposeMutations in the epidermal growth factor receptor (EGFR) gene are associated with increased sensitivity of non-small cell lung cancer (NSCLC) to gefitinib, an EGFR tyrosine kinase inhibitor. The objective of this study was to prospectively evaluate the efficacy of gefitinib in patients with stage III/IV NSCLC whose tumors carried EGFR mutations, irrespective of previous chemotherapy.Experimental DesignGenomic DNA was extracted from tumor specimens and EGFR mutations in exons 19 and 21 analyzed by direct sequencing. Patients with stage III/IV NSCLC whose tumors had the EGFR mutations received gefitinib (250 mg/day orally). Response, toxicity and survival data were assessed.ResultFrom November 2004-May 2006, 21 patients with EGFR mutations received gefitinib (median age: 59 years; 17 females; 19 non-smokers; all had adenocarcinomas). Two patients discontinued gefitinib and withdrew from the study 3 weeks after gefitinib initiation (interstitial pneumonitis, 1 patient; facial acne, 1 patient). Of 19 patients, 3 achieved complete response, 13 exhibited partial response and 3 had stable disease. Response and disease control rates were 76% (95% confidence interval [CI] 53-92) and 90% (95% CI 70-99), respectively. The most common adverse event was skin toxicity (67%); however, no grade 4 skin toxicities were seen. Ten patients relapsed and three died at a median follow-up period of 12.6 months (range 5.6-23.8 months); median progression-free survival was 12.9 months.ConclusionAnalysis of tumor EGFR mutations in patients with NSCLC could be used to identify patients suitable for treatment with gefitinib to obtain optimum response and disease control rates.

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