Results: Evaluation of the response one month later using triphasic CT showed significant better responses in GII compared to GI (83.3% vs 60%) with P value <0.05. The response 3 months later was not changed significantly compared to the response after one month of the procedure (56.7% in GI and 80% in GII) Conclusion: Ablation of inoperable large HCC 5.1-7cm can be done with combined techniques. RFA plus acetic acid was compared to RFA plus ethyl alcohol. Complete ablation was superior when acetic acid was used.