Table 5.

Prevalence of T790M mutations according to clinical characteristics

Characteristics	T790M (%)	P
EGFR mutation at diagnosis		0.569
Exon 19 deletion (n = 34)	13 (38.2)
L858R mutation (n = 23)	6 (26.1)
Specimen type of re‐biopsy		0.845
Tissue (n = 40)	14 (35.0)
All cytology (n = 17)	5 (29.4)
Pleural effusion (n = 13)	3 (23.1)
Site of re‐biopsy		0.845
Intrathoracic lesion (n = 43)	12 (27.9)
Extrathoracic lesion (n = 14)	7 (50.0)
EGFR‐TKIs		0.107
Gefitinib (n = 21)	8 (38.1)
Erlotinib (n = 29)	11(38.0)
Afatinib (n = 7)	0 (0.0)

Values are presented as number (%).