Table 1. Comparison of L858R detection on different plasma DNA isolation systems.

		PlasmaDNA
		200-M		200-A		1000-A
		L858R Positive	L858R Negative	L858R Positive	L858R Negative	L858R Positive	L858R Negative
Tissue	L858R Positive (n = 41)	15	26	24	17	31	9
	L858R Negative (n = 30)	2	28	0	30	1	29
Total (n = 71)		17	51	24	47	32	38
Sensitivity		36.6%		58.8%		77.5%		**P < 0.01
Specificity		93.3%		100%		96.7%		P = 0.36
Concordance		60.6%		76.1%		85.7%		**P < 0.01