21154
Given the efficacy of EGFR TKIs in advanced NSCLC in the salvage setting , and their favourable toxicity profile compared with conventional chemotherapy , there is considerable interest in evaluating their efficacy in the first - line treatment of advanced NSCLC .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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