研究发现T790M阴性患者再使用吉非替尼的获益更多。T790M阴性患者的DCR明显高于T790M阳性患者,为78.1% vs 45.5%;T790M阴性患者有2例PR,T790M阳性则无。T790M阴性患者的中位PFS增加了一倍以上,为4.7m vs 2.0m;中位OS的获益亦偏向于T790M阴性患者,为15.2m vs 7.7m。T790M阴性的患者在DCR,PFS及OS都统一取得了获益优势。
Yong Song, Yi-Long Wu et al.Efficacy and Safety of Gefitinib as Third-line Treatment in NSCLC Patients With Activating EGFR Mutations Treated With First-line Gefitinib Followed by Second-line Chemotherapy A Single-Arm, Prospective, Multicenter Phase II Study(RE-CHALLENGE, CTONG1304).2019