Percutaneous Cryoablation of Metastatic Lesions from Colorectal Cancer: Efficacy and Feasibility with Survival and Cost-Effectiveness Observations

Table 1

Patient, procedure, and tumor characteristics. The 6 procedural locations included lung, liver, and 4 soft tissue sites: adrenal, para-aortic/isolated, bone, superficial, and intraperitoneal. Lung tumor locations consisted of metastatic lesions in lung parenchyma and/or chest wall but did not include mediastinal or hilar adenopathy. Superficial tumor locations consisted of predominantly subcutaneous, muscular, and/or lymph node metastases within the extremities or torso wall. Intraperitoneal tumors were isolated within the abdominal cavity and NOT adherent to bowel. Tumors in bone locations were limited metastatic deposits in nonweight bearing locations with the epicenter in osseous structures.

Location	Liver	Lung		Soft tissue			Total*
			Retroperitoneal	Intraperitoneal	Bone	Superficial
Number of patients	48	10	2	2	3	1	59*
Number of procedures	80	21	2	2	5	2	111*
Number of tumors	116	33	2	2	6	2	151
Mean tumor diameter (cm^3)	3.8	2.7	3.1	3.7	5.6	2.0	3.7
Mean ablation diameter (cm^3)	5.6	4.6	4.5	6.1	7.4	4.0	5.5

∗Totals do not equal the summation because soft tissue is broken down into 4 categories and overlap in the total. Retreatment of a single tumor as well as a single procedure involving multiple locations also overlaps totals.