Correlation of dynamic contrast-enhanced ultrasonography and the Ki-67 labelling index in pancreatic ductal adenocarcinoma

Table 2 Clinical data and gray-scale ultrasonography characteristics of the patients, n (%)

Characteristics	The high Ki-67 expression group (n = 13)	The low Ki-67 expression group (n = 17)	P value
Age, mean ± SD (years)	62.62 ± 6.86	63.06 ± 7.00	0.864
Gender			0.061
Male	5 (38.5)	13 (76.5)
Female	8 (61.5)	4 (23.5)
BMI			1.000
≥ 23.9	3 (23.1)	5 (29.4)
< 23.9	10 (76.9)	12 (70.6)
Diabetes mellitus			0.440
Yes	3 (23.1)	7 (41.2)
No	10 (76.9)	10 (58.8)
Location			1.000
Head and neck	9 (69.2)	12 (70.6)
Body and tail	4 (30.8)	5 (29.4)
Tumor size, mean ± SD (cm)	4.22 ± 1.51	3.52 ± 1.26	0.186
Echogenicity			0.492
Isoechoic	0 (0)	2 (11.8)
Hypoechoic	13 (100)	15 (88.2)
Margin			0.460
Well-defined	6 (46.2)	11 (64.7)
Ill-defined	7 (53.8)	6 (35.3)
Texture			0.492
Solid	0 (0)	15 (88.2)
Solid-cystic	13 (100)	2 (11.8)
Shape			0.705
Regular	8 (61.5)	12 (70.6)
Irregular	5 (38.5)	5 (29.4)
Blood flow signal			0.033a
Present	3 (23.1)	11 (64.7)
Absent	10 (76.9)	6 (35.3)
Main pancreatic duct dilation (> 3 mm)			1.000
Present	7 (53.8)	9 (52.9)
Absent	6 (46.2)	8 (47.1)

^aP < 0.05.

BMI: Body mass index.