(a).

Characteristics	CEA		P value
	>35%	≤35%
Gender			1.000
Male	10	32
Female	8	23
Primary tumor			0.022
Colon	7	38
Rectum	11	15
No. of metastatic sites
1	10	49
>1	8	6
Only liver	2	30
Only lung	3	14
Only local abdominal mass	2	3
Only peritoneum	3	2