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Kaplan–Meier curve of PFS (A) and OS (B) for patients with epidermal growth factor receptor exon 19 deletion.
Notes: Group A1, 31 patients received icotinib+chemotherapy; Group B1, 42 patients received icotinib alone; Group C1, 29 patients received chemotherapy alone.
Abbreviations: OS, overall survival; PFS, progression-free survival.
