Table I.

Definition of C_q thresholds for strong positive, weak positive and negative EGFR mutation detection status.

Strong positive	Strong positive	19Del	L858R	T790M	Insertions	G791X	S786I	L861Q
Strong positive	Mutant Cq value	Cq<26	Cq<26	Cq<26	Cq<26	Cq<26	Cq<26	Cq<26
Weak positive	Mutant Cq value	26≤Cq<29	26≤Cq<29	26≤Cq<29	26≤Cq<29	26≤Cq<29	26≤Cq<29	26≤Cq<29
	ΔCq threshold value	12	11	7	9	7	8	8
Negative	Mutant Cq value	Cq≥29	Cq≥29	Cq≥29	Cq≥29	Cq≥29	Cq≥29	Cq≥29

C_q, cycle threshold; ΔC_q, mutant C_q minus control C_q.