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EGFR 21外显子突变（A）、初始TKI缓解期≥6个月（B）及两次TKI间隔期≥3个月（C）对再次应用TKI的影响
Influence of Exon 21 mutation (A), progression free survival not less than 6 months (B), the period of time (not less than 3 months) following the termination of the initial TKI treatment (C) to retreatment TKI
