From: Comparison of KRAS and EGFR gene status between primary non-small cell lung cancer and local lymph node metastases: implications for clinical practice
Primary/Metastatic tumor
WT/WT
WT/MUT
MUT/WT
MUT/MUT
Discordance
EGFR
54
5
0
21*
7 case
KRAS
73
6
1
6 case