Table 4.

Performance of the ddPCR assay for detecting cfDNA EGFR mutations in comparison with NGS.

	cfDNA ddPCR	NGS		Concordance	Kappa	P
		Positive	Negative	(%)
E746_A750del	Positive	16	3	89.5
	Negative	3	35		0.763	<0.001
L858R	Positive	14	1	98.3
	Negative	0	42		0.954	<0.001
T790M	Positive	6	2
	Negative	2	47	93.0	0.709	<0.001