Preoperative serum carbohydrate antigen 19-9 levels predict early recurrence after the resection of early-stage pancreatic ductal adenocarcinoma

Table 1 Patient demographics

Characteristics	Patients, n = 407 (%)
Age in yr, median (range)	62 (30-88)
Sex, n (%)
Male	225 (55.3)
Female	182 (44.7)
BMI in kg/m2, median (range)	23.2 (15.3-31.6)
Pre-op CA 19-9 in U/mL, n (%)
Normal	167 (41)
Abnormal	240 (59)
Tumor location, n (%)
Head/uncinate	254 (62.4)
Neck/body/tail	151 (37.1)
Head/body	2 (0.5)
Tumor size, median, cm (range)	2.5 (0.3-4.0)
Total number of harvested lymph nodes, median (range)	14 (1-74)
Differentiation, n (%)
Well	60 (14.9)
Poor	288 (71.6)
Unknown	54 (13.4)
Moderate	5 (1.2)
Stage, n (%)
IA	109 (26.8)
IB	298 (73.2)
Adjuvant chemotherapy, n (%)
No	154 (37.8)
Yes	253 (62.2)
Recurrence within 6 mo, n (%)
No	309 (75.9)
Yes	98 (24.1)

BMI: Body mass index; CA 19-9: Carbohydrate antigen 19-9.