Jun Sakurai, Presenter: Nothing to Disclose

Takao Hiraki MD, Abstract Co-Author: Nothing to Disclose

Hideo Gobara MD, Abstract Co-Author: Nothing to Disclose

Hiroyasu Fujiwara MD, PhD, Abstract Co-Author: Nothing to Disclose

Hidefumi Mimura MD, Abstract Co-Author: Nothing to Disclose

Susumu Kanazawa MD, Abstract Co-Author: Nothing to Disclose

Nobuhisa Tajiri MD, Abstract Co-Author: Nothing to Disclose

et al, Abstract Co-Author: Nothing to Disclose

et al, Abstract Co-Author: Nothing to Disclose

To determine which lung tumors can be effectively treated with a single radiofrequency (RF) application (defined as application of RF energy at a single electrode position) by using a multitined expandable electrode with arrays 2-cm in diameter.

We retrospectively evaluated the outcomes of 90 lung tumors in 38 patients (21 men and 17 women; mean age, 58 years) treated with a single RF application by using a multitined expandable electrode with arrays 2-cm in diameter. Mean long-axis tumor diameter was 0.9 cm ± 0.3 ( range; 0.4 – 1.6 cm). The overall technique effectiveness rates were estimated using Kaplan-Meier analysis based on the results of follow-up CT scan. Multiple variables were analyzed using the log-rank test to determine risk factors for local tumor control. Then, the technique effectiveness rates were again estimated when considering only tumors without risk factors.

The median follow-up period was 13.2 months (mean, 13.2 months; range, 6.0 – 24.7 months). The overall technique effectiveness rates were 92% at 1 year and 75% at 2 years. Tumor size >1.0cm and contact of tumors to the bronchus were the risk factor for local tumor control. The technique effectiveness rates for tumors ≤1.0 cm that were not contiguous to the bronchus were 96% at 1 year and 96% at 2 years.

Lung tumors ≤1.0 cm that were not contiguous to the bronchus were suitable candidates for a single RF application by using the electrode with arrays 2-cm in diameter.

It is essential to determine which tumors can be effectively treated with a single RF application because multiple needle insertion translate into longer procedural times and more radiation exposure.

Sakurai, J, Hiraki, T, Gobara, H, Fujiwara, H, Mimura, H, Kanazawa, S, Tajiri, N, et al, , et al, , Single Application of Percutaneous Radiofrequency Ablation of Lung Tumors by Using a Multitined Expandable Electrode with Arrays 2-cm in Diameter: Determination of Suitable Tumor Candidates.  Radiological Society of North America 2007 Scientific Assembly and Annual Meeting, November 25 - November 30, 2007 ,Chicago IL. http://archive.rsna.org/2007/5001921.html