Table 1. Patients’ demographics and characteristics of primary colorectal cancer.

Mean age at metastasectomy	56 [33–76]
Gender
Male	77 (59.7)
Female	52 (40.3)
Location of primary cancer
Colon	38 (29.5)
Rectum	91 (70.5)
DFI to lung metastasis
<12 months	14 (10.9)
≥12 months	115 (89.1)
Primary stage
0 (NRT)	4 (3.1)
I	19 (14.7)
II	44 (34.1)
III	62 (48.1)
PCRT for primary rectal cancer	54/91 (59.3)
Adjuvant chemotherapy for primary cancer
None	7 (5.4)
5-FU based	56 (43.4)
Capecitabine	52 (40.3)
Others	11 (8.5)
Not known	3 (2.3)

Data are presented as n [range] or n (percent).

DFI = disease-free interval; NRT = no residual tumor; PCRT = preoperative chemoradiotherapy; FU = fluorouracil.