Table 1. Patient and tumor characteristics.

Age in years
(median age, age range)	65 (25–85)

Gender
Female	181 (66.3%)
Male	92 (33.7%)

K-Ras gene mutation status
Mutation	89 (32.6%)
Codon 12	76 (27.8%)
Codon 13	10 (3.7%)
Undetermined localization	3 (1.1%)
Wild-type	184 (67.4%)

B-Raf gene mutation status
Mutation	17 (6.2%)
Exon 11	1 (0.3%)
Exon 15	16 (5.9%)
Undetermined status of mutation	10 (3.7%)
Wild-type	246 (90.1%)

Primary tumor localization
Colon	112 (41.1%)
Sigmoid colon	100 (36.6%)
Rectum	61 (22.3%)

Localization of metastases
Liver	129 (66.5%)
Lungs	39 (20.1%)
Other localizations	126 (64.9%)