Table 1. Clinicopathological features of colorectal cancer (CRC) and cancer-free control samples.

N	CRLM	CRC	Control	P valve
Age Mean (SE) year	55.33(0.11)	54.28(0.41)	56.19(0.43)	0.45a
Sex (male/female)	135/65	122/78	134/66	0.32b
Differentiation grade
Well	0	0		0.19b
Moderate	144	132
Poorly	56	68
Tumor Size(cm)				0.61b
≤5 cm	127	122
>5 cm	73	78
cT staging system				0.16b
T1+T2	89	75
T3+T4	111	125

^aStudent t-test.

^bChi-square test.