Table 1 Summary of patient characteristics

 Mean age (range)

67 (43–87)

 Gender (M:F)

20:10

Initial tumor characteristics

 T2

8 (27%)

 T3

13 (43%)

 T4

9 (30%)

 N1

12 (40%)

Tumor location (number of patients):

 Head

21 (70%)

 Body / Tail

9 (30%)

Mean volume (range) [cm³]

 CTV

25.6 (3.2-78.8)

 PTV

70.9 (20.4-205.2)

Prior therapy (no. of patients)

 Surgery

9 (30%)

 Chemotherapy

30 (100%)

 Radiation therapy

0 (0%)