Table 1.

Prognostic factors after resection of colorectal cancer lung metastases

Factors resulting in poor prognosis	Description
Multiple metastatic lesions	Poor survival if > 1 lesion [24, 26, 34, 35, 37]
	Poorer survival if the number of metastasis > 4 or metastases are present in both lungs [28, 29]
Hilar/mediastinal lymph node metastases present	Poor survival if lymph node metastases are present [30, 32, 33, 35, 37, 39, 41]
High preoperative CEA levels	Poor survival if > 5 ng/ml [33–35, 37, 40, 41]
Large tumor diameter	The larger the tumor, the poorer the survival [34]
Short disease-free interval (DFI)	Poor survival if DFI < 24 months [26]
Older age	Poor survival if > 70 years [29]
Advanced primary tumor stage	Advanced stage of primary tumor results in poor prognosis [36]
Primary tumor located at the rectum	Rectal cancer has a poorer survival than colon cancer [25]
R1 or R2 resection	R1 or R2 resection is associated with poor survival [33, 42]
Pulmonary lobectomy	Pulmonary lobectomy has poorer survival than wedge resection or segmental resection of the lung [40]