TORONTO, OntarioImage-guided thermal ablation can provide much needed relief of chronic pain in chest wall tumor patients. According to research presented at the annual meeting of the Society of Interventional Radiology (abstract 168), thermal ablation not only relieves pain but may even contribute to longer survival. In addition, ablation may have synergistic effects with radiation therapy.
Chest wall cancer can be debilitating, and often spreads to bone, said Damian Dupuy, MD, professor of diagnostic imaging, Brown University, and Rhode Island Hospital. Indeed, skeletal metastases are present in more than 80% of advanced lung, breast, and prostate cancer patients, and of these patients, 50% to 70% have uncontrollable pain.
Dr. Dupuy pointed out that as cancer treatments are getting better at prolonging life, more people are surviving with metastatic diseasemaking the issue of chronic pain a growing problem.
A retrospective study was launched to evaluate the subjective benefits of palliative thermal ablation applied to tumors of the chest wall. Most patients had non-small-cell lung cancer, and the most frequent site for metastasis was the ribs. "Most of these cancers were about 2 inches in diameter when we treated them, and some were as large as 5 inches in diameter," he said.
58 Thoracic Tumors
The study included 52 adults (median age, 65 years) with 58 thoracic tumors treated with ablation51 with radiofrequency ablation, 5 with microwave ablation, and 2 with cryoablation.
Pain was evaluated through several methods: standard pain scale measures, tracking changes in narcotic use by the patients, and reviewing individual medical records. Because of the retrospective nature of the study, evaluations were not the same for all patients. "Initially, we assessed the pain response within 2 weeks after the therapy," Dr. Dupuy said.
Follow-up data were available on 39 patients who had undergone a total of 44 ablations (median follow-up, 6 months). "More than 70% had an improved symptomatology after the treatment. In about 15% to 17%, pain was unchanged, and in about 11% it was worse," he said. Close to 67% of surviving patients reported that their pain was under control a year after ablation, showing that the treatment has durability.