Table 4. Clinical characteristics, ENETS staging and WHO classification of pancreatic neuroendocrine tumors cases sorted by ABO blood types.

Variables	O	A	B	AB	P* O vs. non-O	P* A vs. non-A	P* B vs. non-B
F PNET, n	87	70	67	20
Age, year (Mean ±SD)	48.7±12.6	48.8±15.1	45.2±14.2	46.1±12.2	0.395	0.388	0.116
Gender: M/F	28/60	26/44	27/40	10/10	0.232	0.913	0.518
Tumor diameter, cm
<2/2-4/>4	62/26/0	44/26/0	48/18/1	12/7/1	0.666	0.175	0.434
Lymph node status
Positive/ Negative	3/84	2/68	0/67	1/19	1.000	1.000	0.190
Distant metastasis
Yes/no	1	2	0	1	1.000	0.598	0.313
WHO classification					0.629	0.575	0.951
NET G1	63	52	49	12
NET G2	14	9	13	6
NEC G3	1	2	2	1
Missing data	9	7	2	1
ENETS stage at diagnosis					1.00	1.000	0.677
I - II	85	68	62	19
III-IV	3	2	5	1
NF- PNET, n	46	44	38	14
Age, year Mean ±SD	52.1±10.2	52.3±12.1	54.5±13.3	52.1±13.1	0.632	0.746	0.313
Gender: M/F	28/18	26/18	18/20	12/2	0.856	1.000	0.122
Tumor diameter, cm
<2/2-4/>4	6/26/14	7/24/13	2/24/12	2/8/4	0.959	0.622	0.326
Lymph node status
Positive/ Negative	5/41	5/39	9/29	1/13	0.608	0.451	0.047
Distant metastasis at diagnosis
Yes/no	5/41	4/40	8/30	0/14	0.779	0.479	0.044
WHO classification					0.272	0.123	0.861
NET G1	23	32	21	6
NET G2	14	7	11	3
NEC G3	5	2	3	2
Missing data	4	3	3	3
ENETS stage at diagnosis					0.146	0.833	0.040
I - II	36	31	21	10
III - IV	11	13	17	4

Note: *Kruskal-Wallis test was used for age, and Pearson's χ² test was used for the others.