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Fig. 4 —Curves indicate cumulative survival in three groups with different histologic grades after radiofrequency ablation. Cumulative survival rates at 1, 3, and 5 years were 97%, 79%, and 71%, respectively, for group 1; 92%, 56%, and 44%, respectively, for group 2; and 100%, 57%, and 43%, respectively, for group 3. Three- and 5-year cumulative survival rates in group 1 were higher than those of groups with higher histologic grades, but no statistically significant difference was found for cumulative survival rates between groups (p > 0.05). Number of patients followed up at 1, 3, and 5 years was 35, 14, and one, respectively, in group 1; 46, 23, and seven, respectively, in group 2; and seven, four, and two, respectively in group 3.