Results of EGFR mutation status recheck in part of patients with objective response to erlotinib treatment.

EGFR, epidermal growth factor receptor; ECOG, Eastern Cooperative Oncology Group performance status; C/T, chemotherapy; PFS, progression-free survival; CS, current smoker; FS, former smoker; NS, non-smoker; MS, matrix-assisted laser desorption ionization-time of flight mass spectrometry; DS, direct sequencing.aEGFR mutation status of patient S4 was analyzed as wild type by PNA-LNA PCR clamp in September 2011 and our facility was able to detect Del L747_A750>P since September 2013 by adding new mutation detection probes.bStill under erlotinib treatment without progression.Results of EGFR mutation status recheck in part of patients with objective response to erlotinib treatment.