Table I.

Distribution of mutations according to the characteristics of colorectal cancer patients.

Characteristic	No. (N=551)	KRAS mutations (%)	P
Gender
Male	328	103 (31)	0.654
Female	223	80 (36)
Tumor site
Right-transverse colon	181	62 (34)	0.933
Left colon	263	85 (32)
Rectum	107	36 (34)
Disease stage at diagnosis
Stage II	162	50 (31)	0.247
Stage III	140	47 (34)
Stage IV	249	86 (35)
Age, years
<50	51	18 (35)	0.788
50–59	122	48 (39)
60–69	200	64 (32)
70+	178	53 (30)