Table 1:

Clinicopathological characteristics of patients in the clinical cohorts

		Tissue cohort	Serum cohort
Variable		number	number
Gender	male	116	30
	female	83	21
Age at operation	median (range)	67 (35 – 90)	67 (45 – 87)
CA19-9 value (U/ml)	median	133.8	79.5
Neoadjuvant chemotherapy	No	183	8
	Yes	16	35
	Missing	0	8
Tumor location	pancreatic head	146	37
	pancreatic body or tail	53	14
Tumor size (mm)	median (range)	30 (4 – 65)	30 (9 – 110)
Histological type	well or moderate	169	45
	poorly	30	6
T factor	T1 or T2	10	9
	T3 or T4	189	42
Lymph node metastasis	negative	56	27
	positive	143	24
Distant metastasis	negative	186	41
	positive	13	10
UICC Stage	IA or IB or IIA	55	22
	IIB or III	131	19
	IV	13	10
Lymphatic invasion	negative	34	27
	positive	165	24
Venous invasion	negative	63	NA
	positive	136	NA