Table 5.

Distribution of EGFR mutations

Mutational type	Total	Proportion
EGFR L858R	238	26.8%
EGFR 19-del	222	25.0%
EGFR L861Q	15	1.7%
EGFR 20-ins	14	1.6%
EGFR Exon 18 mutant	13	1.5%
EGFR T790M	13	1.5%
EGFR S768I	2	0.2%
EGFR mutant	499	56.1%
EGFR-	390	43.9%
Totala	889	100.0%

^aThe number of EGFR mutant was less than that of EGFR mutations due to co-mutation