Functionality is not an independent prognostic factor for pancreatic neuroendocrine tumors

Table 1 Characteristics of patients in the two databases, n (%)

Database	SEER database (n = 426)	West China Hospital database (n = 205)	P value
Race			NC
White	357 (83.8)	0 (0.0)
Asian1	25 (5.9)	205 (100)
Others2	44 (10.3)	0 (0.0)
Tumor site			< 0.001
Head	104 (24.4)	85 (41.5)
Body	51 (12)	55 (26.8)
Tail	168 (39.4)	44 (21.5)
Unknown	103 (24.2)	21 (10.2)
Age (yr)			< 0.001
0-55	193 (45.3)	138 (67.3)
56-	233 (54.7)	67 (32.7)
Sex			0.035
Male	221 (51.9)	88 (42.9)
Female	205 (48.1)	117 (57.1)
Primary tumor			0.0303
T1	121 (28.4)	80 (39)
T2	135 (31.7)	72 (35.1)
T3	94 (22.1)	44 (21.5)
T4	41 (9.6)	9 (4.4)
Tx	35 (8.2)	0 (0)
Regional lymph node metastasis			0.1713
N0	188 (44.1)	41 (20)
N1	149 (35)	22 (10.7)
Nx	89 (20.9)	142 (69.3)
Distant metastasis			0.0443
M0	143 (33.6)	193 (94.1)
M1	19 (4.5)	12 (5.9)
Mx	264 (62)	0 (0)
Grade			< 0.0013
pNET G1	229 (53.8)	90 (43.9)
pNET G2	45 (10.6)	96 (46.8)
pNET G3 or pNEC	16 (3.8)	9 (4.4)
Gx	136 (31.9)	10 (4.9)
Functionality			< 0.001
N	326 (76.5)	101 (49.3)
I	52 (12.2)	85 (41.5)
O	48 (11.3)	19 (9.3)
Surgery			< 0.0013
Pancreaticoduodenectomy	143 (33.6)	39 (19)
Total pancreatectomy	39 (9.2)	6 (2.9)
Partial pancreatectomy	203 (47.7)	88 (42.9)
Local excision	38 (8.9)	72 (35.1)
Other surgeries	3 (0.7)	0 (0)

¹Consisting of Asian and Pacific Islander patients.

²Consisting of Black and American Indian patients and patients whose races were unknown.

³Rows with the title Tx, Nx, Mx, Gx, and other surgeries were not involved in the χ² test. SEER: Surveillance, epidemiology, and end results; NC: Not comparable; pNET: Pancreatic neuroendocrine tumor; pNEC: Pancreatic neuroendocrine carcinoma; I: Insulinoma; N: Nonfunctional pNEN; O: Other functional pNEN.