Table 1. Clinical data.

Variable	n
Age(y,mean and range)	61.25(43–82)
Sex
Male	50
Female	38
CEA level
CEA≥5ng/ml	37
CEA<5ng/ml	51
DFS
≥18	37
<18	36
metastases
No. = 1	63
No.>1	25
synchronous metastasis	15
metachronous metastasis	73
Primary tumor
rectum	46
colon	42