Table 1. Patients characteristics.

Variable	Metastasectomy	Pneumonectomy		P
	n=4,742	n=55	%
Sex
Male	2,655	34	1.28	0.411
Female	2,056	21	1.02	–
N/A	31	–	–	–
Age (years)
Mean (SD)	58.9 (15.2)	55.5 (13.3)
–39	432	6	1.34	0.889
40–49	389	6	1.54	0.681
50–59	941	18	1.91	0.068
60–69	1,354	22	1.63	0.225
70–	1,063	3	0.28	0.001
N/A	563	–	–	–
Operation year
1984–1998	1,418	26	1.77	0.012
1999–2013	3,124	29	0.91	–
N/A	200	–	–	–
Primary site
Colorectal	2,184	28	1.28	0.468
Head & neck	463	12	2.59	0.002
Breast	307	2	0.65	0.390
Kidney	335	0	0	0.040
Uterus	277	2	0.72	0.483
Bone	273	3	1.10	0.923
Soft tissue	282	2	0.71	0.466
Liver	109	2	1.84	0.505
Bladder	55	3	5.46	0.003
Esophagus	103	0	0	0.266
Stomach	65	0	0	0.379
Testicle	72	0	0	0.354
Other	217	1	0.46	0.325