Table 1 Patient characteristics

Median age, years (range)

64 (38–84)

Gender, n (%)

 Male

65 (53)

 Female

58 (47)

ECOG-PS, n (%)

 0

94 (76)

 1

27 (22)

 2

2 (2)

Tumor location, n (%)

 Head

59 (48)

 Body-Tail

64 (52)

Median CEA, ng/mL (range)

3.3 (0.7–70.1)

Median CA19-9, U/mL (range)

366.8 (0.1–27,600)

Adjuvant therapy, n (%)

 Yes

106 (87)

 No

3 (2)

 Unknown

14 (11)

Pathological diagnosis, n (%)

 Yes

75 (61)

 No

48 (39)

Median tumor diameter, mm (range)

32 (11–68)

Lymph node metastasis, n (%)

 Positive

41 (33)

 Negative

82 (67)

Bile duct invasion, n (%)

 Positive

63 (51)

 Negative

60 (49)

Duodenal invasion, n (%)

 Positive

64 (52)

 Negative

59 (48)

Anterior peripancreatic invasion, n (%)

 Positive

104 (85)

 Negative

19 (15)

Posterior peripancreatic invasion, n (%)

 Positive

123 (100)

 Negative

0 (0)

Venous invasion, n (%)

 Positive

123 (100)

 Negative

0 (0)

Arterial invasion, n (%)

 Positive

123 (100)

 Negative

0 (0)

Extrapancreatic nerve plexus invasion, n (%)

 Positive

123 (100)

 Negative

0 (0)

Median GTV volume, cc (range)

44.0 (7.9–141.0)

Median CTV volume, cc (range)

186.5 (85.0–420.6)

Median GTV V60_GyE, % (range)

59.4 (6.2–99.7)

Median CTV V60_GyE, % (range)

59.3(25.6–86.7)