Table 2. Mutation characteristics of the samples.

Case	Concentration (ng/ul)	Mutation	Tumor cell fraction	Mutant allele frequency
1	54	c.2236_2250del	70	45
2	6	WT	30	0
3	16	c.2573T>G	20	60
4	22	c.2235_2249del	20	17
5	30	WT	20	0
6	10	c.2573T>G	80	42
7	23	c.2236_2250del	80	33
8	10	WT	30	0
9	N.D.	N/A	30	N/A
10	3	c.2235_2249del	40	17
11	36	WT	10	0
12	6	WT	20	0
13	3	c.2235_2249del	70	27
14	3	WT	20	0
15	6	c.2573T>G	40	64
16	9	c.2236_2250del	50	54
17	15	WT	60	0
18	1	c.2573T>G	30	60
19	25	c.2236_2250del	50	43
20	11	WT	20	0
21	49	c.2573T>G	40	52