Table 1. Patient Demographic Characteristics and Preoperative Tumoral Features as Assessed by Imaging Studies.
| Characteristic | Patients, No. (%) (N = 99) |
|---|---|
| Sex | |
| Men | 56 (56.6) |
| Women | 43 (43.4) |
| Age at surgery, mean (SEM), y | 57.0 (1.4) |
| Previous abdominal surgery | 57 (57.6) |
| Type of PNET | |
| Nonfunctional | 76 (76.8) |
| Functional | 23 (23.2) |
| Gastrinoma | 6 (26.1) |
| Insulinoma | 9 (39.1) |
| Glucagonoma | 3 (13.0) |
| VIPoma | 1 (4.3) |
| Other | 4 (17.4) |
| Presenting symptoms | |
| Abdominal pain | 18 (18.2) |
| Diarrhea | 7 (7.1) |
| Gastroesophageal reflux disease | 3 (3.0) |
| Duration of symptoms prior to diagnosis, mean (SEM), y | 2.3 (0.7) |
| MEN1 present | 12 (12.1) |
| Other genetic anomalies | 2 (2.0) |
| Fasting serum gastrin, mean (SEM), pg/mL | 636 (110.6) |
| Pancreatic tumor locations | |
| Head | 21 (21.2) |
| Neck | 4 (4.0) |
| Body | 26 (26.3) |
| Tail | 42 (42.4) |
| Other | 6 (6.1) |
| Primary tumor size, mean (SEM), cm | 4.0 (0.2) |
| Lymph node involvement | 20 (20.2) |
| Vascular involvement | 25 (25.3) |
| Portal vein | 4 (16.0) |
| Superior mesenteric vein | 15 (60.0) |
| Superior mesenteric artery | 3 (12.0) |
| Other | 3 (75.0) |
| Invasion into surrounding structures | 9 (9.1) |
| Stomach | 1 (11.1) |
| Bowel | 2 (22.2) |
| Spleen | 2 (22.2) |
| Kidney | 2 (22.2) |
| Adrenal | 2 (22.2) |
| Other | 1 (11.1) |
| Preoperative imaging results positive | |
| CT | 88 (88.9) |
| MRI | 25 (25.3) |
| EUS | 35 (35.4) |
Abbreviations: CT, computed tomographic; MEN1, multiple endocrine neoplasia type 1; PNET, pancreatic neuroendocrine tumor; MRI, magnetic resonance imaging; VIPoma, vasoactive intestinal peptide tumors; EUS, endoscopic ultrasound.
SI conversion factor: To convert serum gastrin to picomoles per liter, multiply by 0.487.