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Updated: Apr 4, 2026
Thermal Ablation for the Treatment of Abdominal Tumors
Published on: March 7, 2011
Radiofrequency Ablation of Lung Tumors Using a Multitined Expandable Electrode: Impact of the Electrode Array
Hiroki Ihara1, Hideo Gobara1, Takao Hiraki1
1Department of Radiology, Okayama University Medical School, 2-5-1 Shikata-cho kita-ku, Okayama 700-8558, Japan.
Purpose:
To retrospectively investigate the impact of the electrode array diameter on local tumor progression after lung radiofrequency ablation.
Materials And Methods:
This study included 651 lung tumors treated using multitined expandable electrodes and followed for ≥ 6 months. The mean long-axis tumor diameter was 12 mm ± 7 (range, 2-42 mm). The difference between electrode array diameter and tumor diameter (DAT) was used to investigate the impact of the electrode array diameter. All tumors were classified into 2 groups according to various variables including DAT (≥ 10 mm or < 10 mm). The primary technique efficacy rates were calculated using Kaplan-Meier analysis and compared between the 2 groups of each variable using the log-rank test. In addition, crude and multivariate multilevel survival analyses were performed by sequentially including DAT and the other variables in 5 models.
Results:
The median DAT for 651 tumors was 12 mm (range, -15 to 24 mm). The technique efficacy rate was significantly lower in the < 10 mm DAT group than in the ≥ 10 mm group (P < .001). In the crude and multivariate multilevel survival analyses, < 10 mm DAT was a significant risk factor for local progression in all models except model 5 (P = .067). In the ≥ 10 mm group, the technique efficacy rates were not significantly different between the 2 ≥ 10 mm DAT subgroups (10 to <15 mm DAT vs ≥ 15 mm DAT).
Conclusions:
DAT is an important risk factor for local progression. We recommend an electrode that is ≥ 10 mm larger than the tumor diameter.
