Table 1. Characteristics of samples from patients with PDAC.

Characteristic	Training set	Validation set	Total
Sex, male/female	33/17	9/8	42/25
Median age (years)	59.5	61	60
Clinical stage	50	17	67
Stage IA	1	0	1
Stage IB	9	2	11
Stage II	15	4	19
Stage III	10	6	16
Stage IV	15	5	20
PDAC CA19-9+	38	15	43
PDAC CEA+	25	9	34
PDAC CA242+	25	8	33

PDAC, pancreatic ductal adenocarcinoma.