Table 1. Baseline characteristics.

Characteristics	Case number
Age
≤60	44(35.20)
>60	81(64.8)
Gender
Male	81(64.80)
Female	44(35.20)
Primary tumor site
Right colon	33(26.40)
Left colon	55(44.00)
Rectum	37(29.60)
ECOG PS
0	96(76.80)
1-2	29(23.20)
Primary tumor resected
No	94(75.20)
Yes	31(24.80)
Metastatic number
1	58(46.40)
>1	67(53.60)