Table 2.

^†EGFR mutation for each patient who underwent tumor re-biopsy and liquid biopsy at ^‡PD time

EGFR mutation	Tumor (n = 10)	Liquid (n = 18)
19del/ T790M	2 (20.0%)	4 (22.2%)
L858R/ T790M	1 (10.0%)	0
19del/ -	4 (40.0%)	3 (16.7%)
L858R/ -	1 (10.0%)	1 (5.6%)
negative	1 (10.0%)	10 (55.6%)
unsuccessful	1 (10.0%)	0
concordance between tumor and liquid biopsy	4/10 (40.0%)

^†EGFR Epidermal growth factor receptor, ^‡PD Progressive disease