Microwave ablation: results in ex vivo and in vivo porcine livers with 2450-MHz cooled-shaft antenna / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Imaging-guided thermal ablation using different energy sources continues to gain favor as a minimally invasive technique for the treatment of primary and metastatic hepatic malignant tumors. This study aimed to evaluate the performance of microwave ablation with 2450-MHz internally cooled-shaft antenna in ex vivo and in vivo porcine livers.</p><p><b>METHODS</b>All studies were animal care and ethics committee approved. Microwave ablation was performed using a noncooled or cooled-shaft antenna in 23 ex vivo (92 ablations) and eight in vivo (36 ablations) porcine livers. Diameters of the coagulation zone were observed on gross specimens. The coagulation diameters achieved in different microwave ablation parameter groups were compared. Curve estimation analysis was performed to characterize the relationship between applied power and treatment duration and coagulation diameter (including short-axis and long-axis diameter).</p><p><b>RESULTS</b>Coagulation zones were elliptical and an arrowed-shaped carbonization zone around the shaft was observed in all groups. But the antenna track was also coagulated in the noncooled-shaft antenna groups. In ex vivo livers, the short-axis diameter correlated with the power output in a quadratic curve fashion (R(2) = 0.95) by fixing ablation duration to 10 minutes, and correlated with the ablation duration in a logarithmic curve fashion (R(2) = 0.98) by fixing power output to 80 W. The short-axis reached a relative plateau within 25 minutes. In in vivo livers, short-axis diameter correlated with the coagulation duration in a sigmoidal curve fashion (60 W group R(2) = 0.76, 80 W group R(2) = 0.87), with a relative plateau achieved within 10 minutes for power settings of 60 W and 80 W.</p><p><b>CONCLUSIONS</b>The internally cooled microwave antenna may be advantageous to minimize collateral damage. The short-axis diameter enlargement has a plateau by fixing power output.</p>

Comprehensive sequential interventional therapy for hepatocellular carcinoma / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Since the 1980s, various approaches to interventional therapy have been developed, with the development and achievement of medical imaging technology. This study aimed to evaluate the effectiveness of comprehensive sequential interventional therapy especially personal therapeutic plan in 53 radical cure patients with hepatocellular carcinoma (HCC).</p><p><b>METHODS</b>From January 2003 to January 2005, a total of 203 patients with HCC received sequential interventional treatment in our hospital. Fifty-three patients achieved radical cure outcomes. Those patients were treated with transcatheter arterial chemoembolization (TACE), radiofrequency ablation (RFA), percutaneous ethanol injection (PEI), or high intensity focused ultrasound (HIFU), sequentially and in combination depending on their clinical and pathological features. PET-CT was used to evaluate, assess, and guide treatment.</p><p><b>RESULTS</b>Based on the imaging and serological data, all the patients had a personal therapeutic plan. The longest follow-up time was 24 months, the shortest was 6 months, and mean survival time was 16.5 months.</p><p><b>CONCLUSION</b>Comprehensive sequential interventional therapy especially personal therapeutic plan for HCC play roles in interventional treatment of HCC in middle or advanced stage.</p>

CT guided 125iodine seed implantation for portal vein tumor thrombus in primary hepatocellular carcinoma / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>This study evaluated the clinical application of CT guided 125iodine implantation in patients with portal vein tumor thrombus in primary hepatocellular carcinoma.</p><p><b>METHODS</b>The ten patients (9 males and 1 female, aged from 36 to 72 years) with portal vein tumor thrombus accompanying hepatocellular carcinoma had been treated with comprehensive therapy including surgery, transcatheter arterial chemoembolization, radiotherapy ablation, microwave ablation or percutaneous ethanol injection. The average diameter of each tumor thrombus was 21.5 mm x 30.5 mm. Seeds of 30 MBq 125I were implanted 5 mm apart within the portal vein tumor thrombus. The follow-up after 4 months included enhanced spiral CT.</p><p><b>RESULTS</b>CT screening of the tumours indicated that 4 out of 10 patients showed complete response to the therapy, 5 partial response and 1 stable disease. Adverse effects included aggravated abdominal dropsy and temporarily increased transaminase, which were controlled by medical management. Severe complications such as haemorrhage, biliary fistula, hepatic abscess, pancreatic fistula and hepatic function failure were not observed. Implanted seeds migrated to lung and left hepatic lobe in 1 case.</p><p><b>CONCLUSION</b>CT guided implantation of 125iodine seeds, can effectively treat portal vein tumor thrombus accompanying hepatocellular carcinoma with minimal damage and few complications.</p>

High intensity focused ultrasound for liver cancer / 中华肿瘤杂志

<p><b>OBJECTIVE</b>To evaluate the effect of high intensity focused ultrasound (HIFU) for liver cancer.</p><p><b>METHODS</b>HIFU treatment was performed in 44 liver cancer patients under general anesthesia and ultrasound positioning. Before and after HIFU treatment, the clinical symptoms, liver functional tests, AFP and MRI were evaluated.</p><p><b>RESULTS</b>After HIFU treatment, the remission rate of clinical symptoms was 87.5% (28/32), with the scanty ascites in 3 patients disappeared. ALT (79.73 +/- 12.31 U/L) and AST (103.47 +/- 24.55 U/L) before HIFU were reduced to normal in 84.6% (22/26) and 73.5% (25/34) patients. AFP in 64.3% (18/28) patients decreased > or = 50% of the original value. After HIFU, MRI showed coagulative necrosis and blood supply reduction or disappearance of tumor in the target region.</p><p><b>CONCLUSION</b>HIFU treatment pocesses good effect on liver cancer, which will offer a considerable weight in noninvasive local treatment of hepatic tumor.</p>