Comparative analysis of radiofrequency ablation and resection for resectable colorectal liver metastases

Table 6 Univariate analysis of 5-year disease-free survival

		RFA (n = 17)		Resection (n = 12)		P-value
		3-yr	5-yr	3-yr	5-yr
Sex	Female	28.6%	28.6%	50.0%	50.0%	0.350
	Male	10.0%	10.0%	50.0%	33.3%	0.039
Age (yr)	≤ 65	25.0%	25.0%	50.0%	25.0%	0.449
	> 65	0.0%	0.0%	46.9%	46.9%	0.012
Primary	I-III	7.1%	7.1%	50.0%	25.0%	0.023
T Stage	IV	66.7%	66.7%	50.0%	50.0%	0.702
Timing of	Synchronous	16.7%	16.7%	66.7%	66.7%	0.201
Metastasis	Metachronous	18.2%	18.2%	41.7%	20.8%	0.172
Preoperative chemotherapy	No	16.7%	16.7%	53.3%	53.3%	0.112
	Yes	18.2%	18.2%	33.3%	0.0%	0.617
Primary site	Colon	10.0%	10.0%	50.0%	25.0%	0.048
	Rectum	28.6%	28.6%	37.5%	37.5%	0.385
Metastatic	Negative	16.7%	16.7%	100.0%	100.0%	0.037
Lymph node	Positive	18.2%	18.2%	29.6%	14.8%	0.325
Lymphovascular invasion	Negative	22.2%	22.2%	50.0%	50.0%	0.137
	Positive	12.5%	12.5%	50.0%	33.3%	0.197
Perineural invasion	Negative	28.6%	28.6%	40.0%	40.0%	0.423
	Positive	10.0%	10.0%	57.1%	28.6%	0.074
Primary	≤ 3 cm	23.1%	23.1%	60.0%	30.0%	0.204
Tumor size	> 3 cm	0.0%	0.0%	38.1%	38.1%	0.013
Postoperative chemotherapy	No	0.0%	0.0%	50.0%	50.0%	0.151
	Yes	25.0%	25.0%	50.0%	33.3%	0.235

RFA: Radiofrequency ablation.