Review Article

Evolving Ablative Therapies for Hepatic Malignancy

Table 5

Summary of studies with irreversible electroporation in patients with primary and metastatic liver malignancy.

Author(s)YearType of studySummary and outcome(s)

Cheung et al. [25]2013Case seriesAim: to evaluate safety, efficacy, and tumor response with IRE in patients with unresectable HCC
Study data: 11 patients with 18 tumors
Conclusions: 72% tumors were completely ablated, 93% success for lesions ≤3 cm; overall, IRE is a safe and feasible technique for local ablation of HCC, particularly for tumors <3 cm

Charpentier [74]2012ReviewAim: to evaluate safety and efficacy of IRE from preclinical and clinical studies
Study data: published studies and abstracts
Conclusions: IRE is safe and effective and offers advantage over conventional thermal ablation due to absence of heat sink effect and preservation of the acellular elements

Kingham et al. [75]2012Case seriesAim: to evaluate safety and short-term outcome with IRE in patients with perivascular malignant liver tumors
Study data: 28 patients with 65 tumors; 79% treated with open approach and 21% percutaneous
Conclusions: IRE is safe for treatment of perivascular hepatic tumors; overall morbidity was 3%, no mortality, 1.9% rate of tumor persistence and 5.7% rate of tumor recurrence

Cannon et al. [76]2013Case seriesAim: to evaluate safety and efficacy of IRE for hepatic tumors
Study data: 44 patients; 40 patients with metastatic lesions and 10 patients with HCC
Conclusions: IRE is safe for treating hepatic tumors that are in proximity to vital structures, initial success achieved in 100% patients; recurrence free survival at 12 months was 59.5%

Philips et al. [77]2013Case seriesAim: to evaluate effects of “learning curve” and experience on outcome with IRE
Study data: 150 patients; 3 groups of 50 patients each, based on chronology
Conclusions: IRE is a safe and effective alternative to conventional ablation; over time, the proficiency to treat complex lesions improves significantly, with a demonstrable learning curve of at least 5 cases to become proficient

Silk et al. [78]2014Case seriesAim: to assess the rate of BC after IRE of hepatic tumors located <1 cm from major bile ducts
Study data: 11 patients with 22 hepatic lesions within 1 cm of major hepatic duct
Conclusions: IRE offers safe treatment option for centrally located liver tumors with margins adjacent to major bile ducts where thermal ablation techniques are contraindicated

Wiggermann et al. [79] 2014Case seriesAim: to predict usefulness of CEUS in evaluating ablation zones after treatment with IRE
Study data: 20 patients were evaluated before and after treatment with IRE
Conclusions: IRE causes significant reduction of microcirculation, which is a marker for successful ablation; CEUS is useful and successfully detects these changes in microcirculation after treatment with IRE

Narayanan et al. [80]2013Case seriesAim: to compare postprocedure pain in patients treated with IRE versus RFA for HCC
Study data: 43 patients; 21 patients treated with IRE and 22 with RFA
Conclusions: IRE is comparable to RFA with respect to postoperative pain

BC: biliary complication; CEUS: contrast-enhanced ultrasound; IRE: irreversible electroporation; HCC: hepatocellular carcinoma; RFA: radiofrequency ablation.