Table 2 Baseline and imaging characteristics of responders and non-responders in the training set

Age(year)

59.53 ± 1.60

61.16 ± 1.24

0.42

Sex (Male/Female)

17/17

26/17

0.36

CA19-9(U/mL)

512.68 ± 198.26

896.84 ± 216.89

0.05

Location

0.93

 Head or neck

13

16

 Body or tail

21

27

Tumor size(cm)

4.27 ± 0.22

4.83 ± 0.20

0.04

Nature

0.72

 Solid

28

34

 Cystic-solid

6

9

MPD dilation (> 4 mm)

12

11

0.36

Lobulated lesion shape

8

21

0.02

Celiac artery involvement

8

15

0.28

Taller-than-wide shape in the longitudinal plane

12

33

 < 0.01

Taller-than-wide shape in the cross plane

8

15

0.28

Blood flow in color doppler

10

13

0.94

Necrosis

4

12

0.08

CEUS patterns

 Arterial phase

0.50

  Iso-enhancement

20

22

   Hypo-enhancement

14

21

 Venous phase

0.01

  Rapid washout

33

33

   Slow washout

1

10

 TTP

 < 0.01

   ≤ 25 s

25

11

   > 25 s

9

32

 Peak_tumor/Peak_normal

0.63 ± 0.03

0.47 ± 0.03

 < 0.01

Treatment

 AG

15

26

0.15

 AS

19

17