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115例三线治疗Ⅲb期/Ⅳ期肺癌患者的三线PFS/OS对比曲线。A：三组的PFS曲线；B：三组的OS曲线；C：靶向治疗组与化疗组的PFS曲线；D：靶向治疗组与化疗组的OS曲线。

The third-line PFS/OS curves of 115 stage Ⅲb/Ⅳ lung cancer patients receiving third-line therapy. A: PFS curves of patients receiving third-line therapy between three groups; B: OS curves of patients receiving third-line therapy between three groups; C: PFS curves of patients receiving third-line therapy between EGFR-TKIs and chemothearpy; D: OS curves of patients receiving third-line therapy between EGFR-TKIs and chemothearpy. PFS: progression free survival; OS: overall survival.