Table 3. Comparison of results of EGFR mutation-specific antibodies and DNA direct sequencing.

IHC for L858R and E746-A750 (N = 143)
IHC L858R	DNA sequencing for L858R
	L858R	Non-L858R	Total
Positive	38	23	61
Negative	5	77	82
Total	43	100	143