Clinical data of patients with advanced non-small cell lung cancer who received Icotinib treatment...Median PFS of exon 19 mutated mutant patients was 11.3 months, mean PFS of exon 21 L858R mutated mutant patients was 8.7 months (P = 0.3145)....Icotinib has great efficacy in EGFR mutated patients, making it an optimal regimen to treat EGFR mutated patients.