TABLE 1.

Demographic characteristics of patients with and without distal metastasis of cancer cells^a

Characteristic	Value for clinical M stage group		P value
	M0/MX (n = 319)	M1 (n = 19)
Age (yrs)	65.8 (10.4)	58.1 (10.7)
No. of patients of sex			0.668
Male	209	11
Female	110	8
No. of patients at clinical T stage			0.008
T1	18	0
T2	67	0
T3	152	8
T4	82	11
No. of patients at clinical N stage			0.101
N0	101	2
N1	82	5
N2	67	4
N3	61	8
NX	8	0
No. of patients with survival outcome			0.681
Alive	186	10
Dead	123	9
Survival time (days)	630 (544)	513 (589)	0.422
No. of patients with disease types			0.999
Adenomas and adenocarcinomas	289	17
Cystic, mucinous, and serous neoplasms	30	2

^aThe numbers in parentheses indicated the sample size. Primary tumor (T), regional lymph nodes (N).