Table 1 Patient characteristics (N = 58)

Age (years)

Mean

60.2

Range

32-83

Gender

Men

36

Women

22

PS

0

28

1

22

2

6

3

2

Adjuvant chemotherapy

No

41

Yes

17

Primary tumor localization

Right colon

6

Left colon

30

Rectum

21

Unknown

1

Metastasis characteristics

Single

23

Multiple

35

Synchronous

36

Metachronous

22

KRAS mutation status

Non-mutated

34

Mutated at codon 12 or 13

16

Unknown

8

Previous administration of bevacizumab for metastatic disease

No

45

Yes

13

Line of cetuximab treatment

First

1

Second

8

Third

32

≥ 4^th

17

Chemotherapy associated with cetuximab

None

2

Irinotecan

41

FOLFIRI

14

FOLFOX

1

Number of cetuximab cycles

Mean

7.6

Median

6.0

Range

1-29