Table 2
EGFR
exon 21 L858R detected by IHC versus mutation analysis
Mass spectrometry mutation status
Exon 21 L858R (p.Leu858Arg) mutation
Positive
Negative
Total
IHC+
6
3
9
IHC−
1
194
195
Total
7
197
204
IHC, immunohistochemistry.