Table 1 Patients’ characteristics

Age: median (range)

70 (49–86)

Sex

  Female

40

49

  Male

42

51

ECOG

  0

31

38

  1

43

52

  2

8

10

Comorbidity (clinically relevant)

(1 missing)

  yes

66

81

Primary tumor

  Colon

56

68

  Rectum

26

32

Resected primary tumor

66

80

Prior radiotherapy for rectal primary

12

15

Adjuvant chemotherapy

19

23

Metastases

(1 missing)

  synchronous metastases

58

72

  metastatic sites

  1

34

42

  >1

47

58

  liver metastases

65

80

Prognosis score acc. to Kohne et al.

(8 missing)

  low risk

64

86

  high risk

10

14