Table 3. Mutation Analysis of KIT and PDGFRA in Patients before and after imatinib treatment.

	Disease status at surgery
	RD (n=10)	PD (n=12)
Before imatinib treatment
KIT exon 9 mutation dupc502+c503	1	3
KIT exon11 mutation V559D	4	2
KIT exon11 mutation del552-553	3	0
KIT exon11 mutation del553-558	1	2
KIT exon 13 mutation K642E	0	1
PDGFRA exon18 mutation D842V	1	3
Wild type	0	1
After imatinib treatment
Original mutation	10	9
Secondary mutation KIT exon 17 Y823D	0	3