Table 3.

Comparison of Clinicopathological Features Between Cases with Aggressive Behavior (n = 9) and Indolent Behavior (n = 49)

Factors		Aggressive (n = 9)	Indolent (n = 49)	P value
Sex	Male	2	10
	Female	7	39	0.879
Age (years)	< 35	5	30
	≥ 35	4	19	0.574
Location	Head	3	11
	Body	1	4
	Tail	2	15
	Body and tail	3	16
	Outside pancreas	0	3	0.799
Symptoms	Present	6	26
	Absent	3	23	0.622
Tumor size (cm)	< 8	2	34
	≥ 8	7	15	0.01
Ki-67 index	< 5%	4	45
	≥ 5%	5	4	< 0.001
Tumor infiltration	Present	6	19
	Absent	3	30	0.354
Mitosis	Present	2	8
	Absent	7	41	0.363
Cellular atypia	Present	0	1
	Absent	9	48	0.650
Vascular invasion	Present	2	4
	Absent	7	45	0.148
Lymph node metastasis	Present	2	2
	Absent	7	47	0.011
Necrosis	Present	4	25
	Absent	5	24	0.749
Calcification	Present	4	29
	Absent	5	20	0.353