Abstract: Objective To evaluate the safety and local control rate and short term survival status of the treatment for primary liver cancer by microwave ablation.Methods From January 2006 to January 2014,a total of 209 lesions in which the average diameter was 3.92cm in 187 patients was performed the microwave ablation therapy.There were 12 lessions adjacent to lung,diaphragm,abdominal wall,stomach,colon and gallbladder area.Enhanced CT examination was performed one month after ablation and the imaging data,liver function,AFP level and quality of life were followed up every three month to evaluate the effectiveness.Results 88.99 percent of lesions achieved complete elimination after an average 1.35 times ablation.The completed elimination ratio for small lesions less than 3cm was up to 100%.Local tumor progression occurred in 23 lesions.Seventheen patients had mild complications.The slight complication rate was about 5.82%.Death and other serious complications did not occur in this study.Conclusion Microwave ablation is safe and feasible for the lesions of liver cancer with live cancer less than 5cm,which is located in the special dangerous area of liver cancer.Microwave ablation can significantly prolong the survival time of patients,especially for small HCC patients with <3cm.

Key words: Primary liver cancer, Microwave ablation, CT-guided