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• W2020166355 abstract "Activating mutations of EGFR are found frequently in a subgroup of patients with non‐small cell lung cancer (NSCLC) and are highly correlated with the response to gefitinib and erlotinib. In the present study, we searched for mutations of EGFR , HER2 and KRAS in 264 resected primary NSCLC from Japanese patients and determined whether there is a correlation between genetic alterations of these genes and clinicopathological factors, together with 85 tumors that we reported previously. EGFR mutations were found in 102 of the total 349 tumors, and seven tumors had two missense mutations. Reverse transcription–polymerase chain reaction of EGFR and subsequent subcloning analyses identified that the double mutations occurred in the same allele. Furthermore, in 202 NSCLC analyzed by Southern blotting, we identified 11 tumors with gene amplification of EGFR, with eight tumors containing a mutation in EGFR . Sequence analysis detected only weak or no signals of the wild‐type allele in the eight tumors, strongly suggesting that the mutated allele was amplified selectively. These findings indicate that a dual genetic change of EGFR can occur in the same allele either with a possible second‐hit mutation or with amplification, which may imply a more selective growth advantage in a cancer cell. Meanwhile, HER2 mutations and amplifications were found in six of 349 tumors and three of 202 tumors, respectively, and KRAS mutations in 21 of 349 tumors. Mutations of the EGFR and HER2 genes were more frequently found in female never or light‐smoking patients with adenocarcinoma, and there were no tumors that had two or more mutations simultaneously among EGFR , HER2 and KRAS . The current study further demonstrates that a double genetic event in EGFR can occasionally occur in lung cancer, thus providing new clues for understanding the involvement of epidermal growth factor receptor signaling cascades in the pathogenesis of NSCLC. ( Cancer Sci 2006; 97: 753–759)" @default.
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• W2020166355 date "2006-06-09" @default.
• W2020166355 modified "2023-10-15" @default.
• W2020166355 title "EGFR point mutation in non-small cell lung cancer is occasionally accompanied by a second mutation or amplification" @default.
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• W2020166355 doi "https://doi.org/10.1111/j.1349-7006.2006.00233.x" @default.
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