Abstract
entire blood drainage area as defined by delayed-phase CT during hepatic arteriography (Group A) or not (Group B). Local tumor progression and survival rates were compared between groups. Results: Median time to recurrence was significantly shorter for Group B (434 days) than for Group A (1474 days, P = 0.0037). Cumulative local recurrence rates for Group A were 0%, 0%, and 1.5% at 1, 3, and 5 years postoperatively, respectively. In comparison, rates for Group B were 3.8%, 17.0%, and 22.8%, respectively (P < 0.0001). Cumulative survival rates were 77.8% and 57.0% at 3 and 5 years, respectively, for Group A. Cumulative survival rates tended to be lower in cases with recurrence in the drainage area (P = 0.0519), at 72.5% at 3 years and 34.9% at 5 years. Conclusions: The safety margin for radiofrequency ablation should be defined as the blood drainage area. Ablation should aim at acquiring adequate safety margins.
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