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Objective To determine whether the specific genotype of exon 19 deletion has a better survival outcome than that of exon 21 substitution in advanced lung adenocarcinoma with EGFR mutant patients that were treated with EGFR-TKIs as second-line therapy after first-line chemotherapy. Methods Between April 1, 2010 and December 31, 2012, the detailed clinical information of 128 patients was screened...
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