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组间生存曲线比较。A：EGFR突变患者中一线与二线及以上患者的PFS比较（16.7个月vs 12.4个月，P =0.006）；B：EGFR外显子19缺失患者与外显子21 L858R突变患者的PFS比较（16.3个月vs 12.4个月，P =0.142）。
Comparison of survival curves between groups. A: PFS of EGFR mutation patients with first line vs second line and above (16.7 months vs 12.4 months, P =0.006); B: PFS in EGFR exon 19 delete and exon 21 L858R mutation patients (16.3 months vs 12.4 months, P =0.142).
