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This study was conducted to assess the efficacy and toxicity of gefitinib as first line treatment in patients with advanced non-small-cell lung cancer (NSCLC).Tumor tissue, derived from either the original tumor or the metastatic or recurrent site was taken from chemo-naïve patients with advanced (stage IIIB, IV and recurrent) NSCLC. Tumor genomic DNA underwent direct sequencing for EGFR exons 18,...
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