Rate of local tumor progression following radiofrequency ablation of pathologically early hepatocellular carcinoma

Table 2 Evaluation of thinnest ablative margins for early hepatocellular carcinoma (n = 50) and typical hepatocellular carcinoma (n = 187) classified into two groups according to contrast-enhanced ultrasonography

	eHCC	tHCC	P value1
AM 0 to < 5 mm	80% (40/50)	85.5% (160/187)	NS
AM ≥ 5 mm	20% (10/50)	14.4% (27/187)	NS

¹Comparison between percentage of each classification of eHCC and tHCC according to χ² test. AM 0 to < 5 mm: thinnest AM equal to 0 mm or more and less than 5 mm; AM ≥ 5 mm: thinnest AM equal to 5 mm or more. AM: Ablative margin; eHCC: Early hepatocellular carcinoma; NS: Not significant; tHCC: Typical hepatocellular carcinoma.