Table 2.

Surgical/pathology findings.

Characteristic	Number (%)
	IMAGE NEG	IMAGE POS	significance
Patient number	58	117
PET found at surgery	57 (98%)	106 (90.5%)	0.059
Primary PET location (surgery)
Location
Pancreas	9 (15.5%)	35 (30%)	0.039
Duodenum	37 (64%)	43 (37%)	0.0008
Lymph node (a)	7 (12%)(a)	13 (11%)(a)	0.85
Other(b)	0 (0%)	13 (10.2%)(b)	0.008
Unknown(c)	5 (8.6%)(c)	24 (20.5%)(c)	0.047
>1 primary tumor	0 (0%)	7 (6%)	0.0036
Primary tumor size (cm)
Mean ± SEM	1.09 ± 0.09	1.9 ± 0.2	<0.01
[range]	[0.2-3]	[0.4-8]
≤ 1 cm	36 (62%)	24 (20.5%)	<0.00001
≥3 cm	1 (1.7%)	21 (18%)	0.0024
Tumor extent at surgery
Primary only	28 (54%)	45 (38%)	0.21
Primary plus lymph node involvement	20 (34%)	51 (44%)	0.25
With liver involvement ± lymph node involvement	4 (6.8%)	9 (7.7%)	0.83
Lymph node metastases only	4 (6.8%)	11 (9.4%)	0.57

^(a)Primary lymph node gastrinoma was defined as previously reported and included a patient in which only lymph nodes (s) were removed who had normal fasting gastrin levels, secretin test result, and imaging postoperatively. (see reference 46)

^(b)Other primary locations includes in the imaging positive group 13 patients with primary tumors in: ovary (n=1),; liver (n=4); pylorus (n=2); heart (n=1); common bile duct (n=2); omentum (n=2); lung cancer (n=1) .

^(c)Unknown includes in the imaging negative and positive groups, respectively: 4 and 11 patients with only lymph node metastases; 0 and 2 patients) with only liver metastases, found determined as described in Methods and 1 and 11 patients with no tumor found.