Indeterminate pulmonary nodules in colorectal cancer

Table 1 Patient characteristics

Characteristic	Lung metastasis (n = 30)	Benign (n = 10)	P value
Gender, male:female	21:9	5:5	0.220
Mean age at diagnosis of CRC, yr	57.6 ± 9.3	60.1 ± 11.6	0.520
Mean age at pulmonary resection, yr	60.6 ± 8.2	61.9 ± 10.7	0.158
Previous hepatic resection for metastasis, n	6	0	0.026
Disease free interval, mo (range)	29.5 (0-104)	16.2 (9-42)	0.078
Timing of thoracotomy, n			0.067
Synchronous	4	0
Metachronous	26	10
> 5 yr after primary CRC surgery	2	2

Disease free interval = the period between primary CRC operation and lung operation. CRC: Colorectal cancer.