Table 1.

Preoperative Clinical and Laboratory Charac-teristics and Tumor Location at Surgery

Characteristic	Value
Patients, n	81
Male sex, %	69
Mean age (range), y*	47 ± 1 (23–69)
Previous gastric surgery, n(%)	10 (12)
Mean disease interval before surgery (range), y	4.7 ± 0.7 (0.1–22)
Mean BAO (range), mEq/h	43.6 ± 2.8 (7–159)
Mean fasting serum gastrin level (range), pg/mL	1373 ± 209 (268–7000)
Positive secretin test, n(%)	70 (86)
Positive calcium infusion test, n(%)	59 (73)
Positive imaging studies, n(%)	58 (72)
Primary tumor location, n(%)†
Duodenum	27 (33)
Pancreatic head	22 (27)
Pancreatic body	4 (5)
Pancreatic tail	5 (6)
No tumor found	3 (4)
Ovary	1 (1)
Lymph node only	19 (24)
Liver metastases, n(%)	5 (6)

^*Means are expressed ± SE. BAO = basal acid output.

^†Tumor location was determined at surgery in all patients.